Heating & Air Conditioning - Service Information Jeep Grand Cherokee WK2

DESCRIPTION

Note. LHD model shown in illustration. RHD model similar.

A Manual Temperature Control (MTC) dual zone and an Automatic Temperature Control (ATC) dual zone heating-A/C system is available on this model.

To maintain the performance level of the Heating, Ventilation and Air Conditioning (HVAC) system, the engine cooling system must be properly maintained. The use of a bug screen is not recommended. Any obstructions in front of the radiator or A/C condenser will reduce the performance of the A/C and engine cooling systems.

The engine cooling system includes the radiator, thermostat, radiator hoses and the engine coolant pump. For more information, refer to ENGINE COOLING SYSTEM before attempting any service to the engine cooling system.

Scheme 1

All vehicles are equipped with a common HVAC housing (1). The heating-A/C system combines A/C, heating, and ventilating capabilities in a single unit mounted within the passenger compartment, beneath the instrument panel. The HVAC housing includes

1. Mode door actuator (2) and air-doors
2. Recirculation door actuator (3) and air-door
3. Particulate air filter (4), when equipped
4. Blower motor (5)
5. Blower motor power module (ATC) (6)
6. Passenger side blend door actuator (7) and air-door
7. Evaporator temperature sensor (8)
8. Heater core (9)
9. A/C evaporator (10)
10. Driver side blend door actuator (11) and air-door

Note. An electric positive temperature coefficient (PTC) heater is used on vehicles when equipped with the 3.0L diesel engine. The PTC heater unit compensates for the lower engine coolant temperatures produced by the diesel engine. The PTC heater unit is mounted in the HVAC air distribution housing, downstream of the heater core. For more information, refer to UNIT, HEATER, DESCRIPTION .

Based upon the system and selected mode, conditioned air can exit the HVAC housing through one or a combination of the four main housing outlets: defrost, panel, floor and console. The defrost and panel outlets are located on the top of the HVAC housing, the floor outlets are located at each side of the HVAC housing, and the console outlet is located at the bottom rear of the HVAC housing. Once the conditioned air exits the HVAC housing, it is further directed through molded plastic ducts to the outlets within the vehicle interior. These outlets and their locations are as follows

1. Defroster Outlets - Two large defroster outlets are located near the center of the instrument panel top cover, near the base of the windshield.
2. Side Window Demister Outlets - There are two side window demister outlets. One is located at the bottom of each A-pillar.
3. Panel Outlets - There are four panel outlets in the instrument panel. One located near each outboard end of the instrument panel facing the rear of the vehicle and one located on each side of the instrument panel center bezel.
4. Floor Outlets - There are four floor panel outlets. One outlet located above each side of the floor panel center tunnel near the dash panel and one outlet located under the rear of each front seat.
5. Console Outlets - There are four console outlets located at the rear of the center floor console. Two facing the rear of the vehicle and one on each side of the console, directing conditioned air under each front seat.

OPERATION

Both the Manual Temperature Control (MTC) and the Automatic Temperature Control (ATC) heating-A/C systems are dual zone, blend-air type systems. In a dual zone blend-air heating-A/C system, two blend-air doors control the amount of conditioned air that is allowed to flow through, or around the heater core. The two blend-air doors provide completely independent side-to-side temperature control of the discharge air. The temperature controls determine the discharge air temperatures by operating the blend door actuators, which move the blend-air doors. This design allows almost immediate control of the output air temperatures.

Scheme 2

Note. Typical blend-air type HVAC system shown in illustration.

The heating-A/C system pulls outside (ambient) air through the fresh air intake (4) located at the cowl panel at the base of the windshield and into the air inlet housing above the Heating, Ventilation and Air Conditioning (HVAC) housing and passes through the A/C evaporator (7). Air flow is then directed either through or around the heater core (2). This is done by adjusting the position of the blend-air door(s) (3) with the temperature control(s) located on the A/C-heater control in the instrument panel. Air flow is then directed out the floor outlet (8), instrument panel outlet (10) or the defroster outlet (1) in various combinations by adjusting the position of the mode-air doors (9 and 11) using the mode control located on the A/C-heater control. The temperature and mode control uses electrical actuators to operate the air doors.

The velocity of the air flow out of the outlets can be adjusted with the blower speed control located on the A/C-heater control.

The fresh air intake can be shut off by pressing the Recirculation button on the A/C-heater control. This will operate the electrically actuated recirculation-air door (5), which closes off the fresh air intake. With the fresh air intake closed, the conditioned air within the vehicle is pulled back into the HVAC housing through the recirculation air intake (6) located within the passenger compartment.

The A/C compressor can be engaged by pressing the A/C (snowflake) button on the MTC A/C-heater control or is automatically engaged on the ATC system when set temperatures require conditioned air cooling. On both systems, the A/C compressor will automatically engage when in any Mix to Defrost position. This will remove heat and humidity from the air before it is directed through or around the heater core.

The two slot-type defroster outlets receive airflow from the HVAC housing through the molded plastic defroster ducts, which connect to the HVAC housing defroster outlets. The airflow from the defroster outlets is directed by fixed vanes in the defroster outlet grilles and cannot be adjusted. The defroster outlet grilles are serviceable from the instrument panel top cover.

The side window demister outlets receive airflow from the HVAC housing through the molded plastic demister ducts. The demisters direct air from the HVAC housing through the outlets located on the A-pillars. The airflow from the side window demister outlets is directed by fixed vanes in the demister outlet grilles and cannot be adjusted. The side window demister outlet grilles are not serviceable from the A-pillars. The demisters operate when the controls are in Heat, Bi-level, Mix and Defrost modes.

The four instrument panel outlets receive airflow from the HVAC housing through two molded plastic main panel ducts. One duct directs air flow out of the right side instrument panel outlets, while the other duct delivers air flow to the left side outlets. Each of these outlets can be individually adjusted to direct the flow of air.

The floor outlets receive airflow from the HVAC housing through the floor distribution ducts which are connected to the rear of the HVAC air distribution housing. Two plastic rear distribution ducts and one center console duct attach to the rear of the air distribution housing and provide conditioned air to the rear seating positions. The airflow from the two rear distribution ducts cannot be adjusted. The two outlets located at the rear of the floor console can be individually adjusted to direct the flow of air, but the outlets on either side of the console cannot be adjusted and air flow is directed by fixed vanes.

Note. It is important to keep the HVAC air intake opening clear of debris. Leaf particles and other debris that is small enough to pass through the cowl opening screen can accumulate within the HVAC housing. The closed, warm, damp and dark environment created within the housing is ideal for the growth of certain molds, mildews and other fungi. Any accumulation of decaying plant matter provides an additional food source for fungal spores, which enter the housing with the fresh intake-air. Excess debris, as well as objectionable odors created by decaying plant matter and growing fungi can be discharged into the passenger compartment during heater-A/C operation if the air intake opening is not kept clear of debris.

The A/C system is designed for the use of non-CFC, R-134a refrigerant and uses an A/C expansion valve to meter the flow of refrigerant to the A/C evaporator. The A/C evaporator cools and dehumidifies the incoming air prior to blending it with the heated air. To maintain minimum evaporator temperatures and prevent evaporator freezing, an evaporator temperature sensor is used. This sensor is located downstream of the evaporator and supplies an evaporator temperature signal to the A/C-heater control.

A/C PERFORMANCE

The A/C system is designed to provide the passenger compartment with low temperature and low humidity air. The A/C evaporator, located in the HVAC housing is cooled to temperatures near the freezing point. As warm damp air passes over the fins of the A/C evaporator, the air transfers its heat to the refrigerant in the evaporator coils and the moisture in the air condenses on the evaporator fins. During periods of high heat and humidity, an A/C system will be more effective in the Recirculation mode (max-A/C). With the system in the Recirculation mode, only air from the passenger compartment passes through the A/C evaporator. As the passenger compartment air dehumidifies, the A/C system performance levels rise.

Humidity has an important bearing on the temperature of the air delivered to the interior of the vehicle. It is important to understand the effect that humidity has on the performance of the A/C system. When humidity is high, the A/C evaporator has to perform a double duty. It must lower the air temperature, and it must lower the temperature of the moisture in the air that condenses on the evaporator fins. Condensing the moisture in the air transfers heat energy into the evaporator fins and coils. This reduces the amount of heat the A/C evaporator can absorb from the air. High humidity greatly reduces the ability of the A/C evaporator to lower the temperature of the air.

However, evaporator capacity used to reduce the amount of moisture in the air is not wasted. Wringing some of the moisture out of the air entering the vehicle adds to the comfort of the passengers. Although, an owner may expect too much from their A/C system on humid days. A performance test is the best way to determine whether the system is performing up to design standards. This test also provides valuable clues as to the possible cause of trouble with the A/C system. The ambient air temperature in the location where the vehicle will be tested must be a minimum of 21° C (70° F) for this test.

A/C PERFORMANCE TEST

Note. When connecting the service equipment coupling to the line fitting, verify that the valve of the coupling is fully closed. This will reduce the amount of effort required to make the connection.

Note. The work area ambient temperature and the evaporator temperature must be above 18.3°C (65°F) prior to conducting the A/C Performance Test.

1. Conduct the A/C System Performance Test (Cooldown Test) found within the HVAC System Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-hvac-system/#heating-air-conditioning-electrical-diagnostics) . If no Diagnostic Trouble Codes (DTCs) are found in the A/C -heater control, Powertrain Control Module (PCM) or Totally Integrated Power Module (TIPM), refer to 2 . If any DTCs are found, repair as required, then, refer to 2 .
2. Connect a tachometer and a manifold gauge set.
3. Operate the heating-A/C system under the following conditions. Engine at 1, 000 rpm at operating temperature Doors and windows closed Transmission in Park A/C-heater controls set to Recirculation mode (max-A/C), full cool, panel mode, high blower and with A/C compressor engaged. If the A/C compressor does not engage, see the A/C System Diagnosis table.
4. Insert a thermometer in the driver side center panel air outlet and operate the A/C system until the thermometer temperature stabilizes. NOTE: This procedure requires the technician to know what the temperature and relative humidity is at the time of the test. The temperature must be combined with the relative humidity to calculate the apparent ambient temperature ("feels like" temperature), when the temperatures are above 21° C (70° F). Use the current ambient temperature and the relative humidity in your location. This information can be obtained from multiple sources, such as the internet or local news media.
5. With the A/C clutch engaged, compare the air temperature at the center panel outlet and the A/C compressor discharge pressure (high side) to the A/C Performance Temperature and Pressure chart. The A/C clutch may cycle, depending upon the ambient temperature and humidity. If the A/C clutch cycles, use the readings obtained before the clutch disengaged (coldest temperature). A/C PERFORMANCE TEMPERATURE AND PRESSURE Ambient Air Temperature (Apparent) 21°C (70°F) 27°C (80°F) 32°C (90°F) 38°C (100°F) 43°C (110°F) Maximum Allowable Air Temperature at Center Panel Outlet 9°C (48°F) 9°C (48°F) 12°C (54°F) 15°C (59°F) 18°C (65°F) Suction Pressure at Service Port (Low Side) 138 to 207 kPa (20 to 30 psi) 138 to 207 kPa (20 to 30 psi) 207 to 276 kPa (30 to 40 psi) 207 to 276 kPa (30 to 40 psi) 241 to 310 kPa (35 to 45 psi) Discharge Pressure at Service Port (High Side) 1034 to 1724 kPa (150 to 250 psi) 1379 to 2068 kPa (200 to 300 psi) 1551 to 2241 kPa (225 to 325 psi) 1724 to 2413 kPa (250 to 350 psi) 2068 to 2758 kPa (300 to 400 psi)
6. If the air outlet temperature fails to meet the specifications in the A/C Performance Temperature and Pressure chart, or if the A/C compressor discharge pressure is high, see the A/C System Diagnosis table.

A/C SYSTEM DIAGNOSIS

HEATER PERFORMANCE

Refer to ENGINE COOLING SYSTEM before performing the following tests. Check the engine coolant level and flow, engine coolant reserve/recovery system operation, accessory drive belt condition and tension, radiator air flow and the fan drive operation. Perform the A/C System Performance Test, which is found within the HVAC System Test. Refer to STANDARD PROCEDURE . If any Diagnostic Trouble Codes (DTCs) are found in the A/C heater control or Powertrain Control Module (PCM), repair as necessary.

MAXIMUM HEATER OUTPUT

Engine coolant is delivered to the heater core through two heater hoses. With the engine idling at normal operating temperature, set the temperature control to the full hot position, the mode control to the floor position, and the blower motor control to the highest speed position. Using a test thermometer, check the temperature of the air being discharged at the front floor outlets. Compare the test thermometer reading to the Heater Temperature Reference chart.

Refer to ENGINE COOLING SYSTEM . If the heater outlet air temperature is below the minimum specification. Both of the heater hoses should be hot to the touch. The coolant return heater hose should be slightly cooler than the coolant supply heater hose. If the return hose is much cooler than the supply hose, locate and repair the engine coolant flow obstruction in the cooling system.

OBSTRUCTED COOLANT FLOW

Possible locations or causes of obstructed coolant flow are as follows

1. Inoperative water pump.
2. Inoperative thermostat.
3. Pinched or kinked heater hoses.
4. Improper heater hose routing.
5. Plugged heater hoses or supply and return ports at the cooling system connections.
6. Plugged heater core.

If proper coolant flow through the cooling system is verified, and heater outlet air temperature is low, a mechanical problem may exist.

MECHANICAL PROBLEMS

Possible locations or causes of insufficient heat due to mechanical problems are as follows

1. Obstructed cowl air intake.
2. Obstructed heater system outlets.
3. Inoperative engine thermostat.
4. Inoperative blower motor system.
5. Inoperative A/C heater control.
6. Inoperative blend door actuator(s).
7. Inoperative, obstructed or improperly installed blend-air door.

TEMPERATURE CONTROL

If the heater outlet air temperature cannot be adjusted with the temperature control on the A/C-heater control, the following could require service

1. Inoperative A/C heater control.
2. Inoperative blend door actuator(s).
3. Inoperative, obstructed or improperly installed blend-air door.
4. Improper engine coolant temperature.
5. Inoperative related wiring harness or connectors.

STANDARD PROCEDURE - A/C EVAPORATOR CLEANING

Some vehicle operators may experience a musty odor from the A/C system, primarily at start up in hot and humid climates. This odor may be the result of microbial growth on the cooling coil. During normal A/C system operation, condensation forms in and around the A/C cooling coil. When airborne pollutants mix with this condensation, bacteria and fungi growth begins and odor may result.

If the vehicle operator experiences a musty odor when operating the A/C system, perform the following procedure.

1. On models equipped with a particulate air filter, remove the filter and inspect for dirt and debris. Refer to «FILTER, PARTICULATE AIR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . Discard the used particulate filter if required.
2. Remove the cowl panel cover. Refer to «COVER, COWL PANEL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
3. Clean any dirt and debris that may be present at the HVAC fresh air inlet screen and at the top of the cowl panel.
4. Install the cowl panel cover.
5. Raise and support the vehicle.
6. Inspect the evaporator drain hose or tube (depending on application) for foreign material that may be blocking the drain and repair as necessary.
7. Once drain operation has been verified; when equipped with a rubber drain hose, temporarily pinch the drain hose closed using an appropriate pair of heater hose pliers. when equipped with a solid plastic drain tube, obtain an appropriate size rubber or plastic cap or plug and temporarily cap or plug the drain tube.
8. Lower the vehicle.
9. Place a protective cover over the front passenger side floor and seat area.
10. Remove the blower motor. Refer to «MOTOR, BLOWER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
11. Remove the blower motor power module. Refer to «MODULE, POWER, BLOWER MOTOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
12. Clean any dirt and debris that may be present inside the HVAC blower motor housing and all readily accessible areas inside the HVAC housing. If necessary, use a vacuum with a small flexible hose, and take caution not to damage the evaporator core fins.
13. Using PSE Flex Spray Delivery Tool 534-62637 or equivalent, completely coat the entire surface of A/C evaporator with three bottles of Mopar® Cooling Coil Cleaner through the blower motor and power module or resistor openings. Be sure to use all of the coil cleaner in each container.
14. Allow the vehicle to sit for 30 minutes.
15. Raise and support the vehicle. WARNING: Excess cooling coil cleaner will drain from the evaporator housing when the clamp, cap or plug is removed from the evaporator drain hose or tube. Always use eye protection, rubber gloves and protective clothing. Avoid continuous breathing of vapors from evaporator coil cleaning fluid. Avoid contact with skin and eyes. Failure to follow these instruction may result in possible serious or fatal injury.
16. Remove the previously installed clamp, cap or plug from the evaporator drain hose or tube and allow excess coil cleaner to drain from the HVAC housing.
17. Lower the vehicle.
18. Refill the three empty coil cleaner bottles with clean tap water.
19. Using PSE Flex Spray Delivery Tool 534-62637 or equivalent, completely rinse the entire surface of A/C evaporator with the three bottles of clean tap water through the blower motor and power module openings. Be sure to use all of the water in each container.
20. Install the blower motor. Refer to «MOTOR, BLOWER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
21. Install the blower motor power module. Refer to «MODULE, POWER, BLOWER MOTOR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
22. Disconnect the wire harness connector from the A/C compressor to disable compressor operation. Refer to «COMPRESSOR, A/C, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
23. Start the engine
24. Adjust all the windows so they are open approximately 8 mm (0.5 in.).
25. Set the A/C heater controls to the following: air distribution to Panel and Recirculation mode temperature to full heat
26. Allow the vehicle to run for 20 minutes.
27. Turn the engine off.
28. Raise and support the vehicle.
29. Inspect the evaporator drain hose or tube (depending on application) for foreign material that may have blocked the drain during evaporator coil cleaning and repair as necessary.
30. Once drain operation has been verified; when equipped with a rubber drain hose, temporarily pinch the drain hose closed using an appropriate pair of heater hose pliers. when equipped with a solid plastic drain tube, obtain an appropriate size rubber or plastic cap or plug and temporarily cap or plug the drain tube.
31. Lower the vehicle.
32. Remove the blower motor. Refer to «MOTOR, BLOWER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
33. Remove the blower motor power module. Refer to «MODULE, POWER, BLOWER MOTOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
34. Using PSE Flex Spray Delivery Tool 534-62637 or equivalent, completely coat the entire surface of A/C evaporator with one bottle of Mopar® Cooling Coil Coating through the blower motor and power module openings. Be sure to use all of the coil coating in the container. NOTE: Be sure to thoroughly clean out the spray delivery tool with warm water once coil coating is complete to prevent damage to the tool.
35. Refill the empty bottles with clean warm tap water and completely rinse out the PSE Flex Spray Delivery Tool 534-62637, or equivalent.
36. Allow the vehicle to sit for 30 minutes.
37. Install the blower motor. Refer to «MOTOR, BLOWER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
38. Install the blower motor power module. Refer to «MODULE, POWER, BLOWER MOTOR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
39. Raise and support the vehicle. WARNING: Excess cooling coil coating will drain from the evaporator housing when the clamp, cap or plug is removed from the evaporator drain hose or tube. Always use eye protection, rubber gloves and protective clothing. Avoid continuous breathing of vapors from evaporator coil sealing fluid. Avoid contact with skin and eyes. Failure to follow these instruction may result in possible serious or fatal injury.
40. Remove the previously installed clamp, cap or plug from the evaporator drain hose or tube and allow excess coil coating to drain from the HVAC housing.
41. Lower the vehicle.
42. Start the engine
43. Adjust all the windows so they are open approximately 8 mm (0.5 in.).
44. Set the A/C heater controls to the following: air distribution to Panel and Recirculation mode temperature to full heat
45. Allow the vehicle to run for 20 minutes.
46. Turn vehicle off.
47. Remove protective cover from front passenger side floor and seat area.
48. On models equipped with a particulate air filter, install the filter. Refer to «FILTER, PARTICULATE AIR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
49. Connect the wire harness connector to the A/C compressor. Refer to «COMPRESSOR, A/C, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
50. Verify proper heating and A/C system operation.

A/C SYSTEM

*Always use the type of PAG oil listed for the model being serviced. See A/C Underhood Specification Label located in the engine compartment. Do not mix different types of PAG oils. Refer to OIL, REFRIGERANT, STANDARD PROCEDURE .

FASTENER TORQUE SPECIFICATIONS

SPECIAL TOOLS

6801 - Terminal Probe (Originally Shipped In Kit Number(s) 10190.) 9764 - Pliers, A/C Snap Ring (Originally Shipped In Kit Number(s) 9909.) C-4755 - Trim Stick (Originally Shipped In Kit Number(s) 9299, 9299CC, 9299CC, 9300A-CAN.)

Scheme 3

Scheme 4

Scheme 5

The blend door actuators (1) are reversible, 12 volt direct current (DC), servo motors. Both dual zone heating-A/C systems use two blend-air doors, which are controlled by two blend door actuators.

The driver side blend door actuator is located on the driver side end of the HVAC air distribution housing and is mechanically connected to the driver side blend-air door. The passenger side blend door actuator is located on the passenger side of the air distribution housing and is mechanically connected to the passenger side blend-air door.

The blend door actuators are interchangeable with each other, as well as with the actuators for the mode-air doors and the recirculation-air door. Each actuator is contained within an identical black molded plastic housing with an integral wire connector receptacle (2). Each actuator has an identical output shaft with splines (3) that connect it to its respective door linkage, and three integral mounting tabs (4) that allow the actuator to be secured to the air distribution housing. The blend door actuators require mechanical indexing to the blend-air door cams and are electronically calibrated by the A/C-heater control.

The blend door actuators are connected to the A/C-heater control through the vehicle electrical system by a dedicated two-wire lead and connector of the HVAC wire harness. The blend door actuator(s) can move the blend-air door(s) in two directions. When the A/C-heater control pulls the voltage on one side of the motor connection high and the other connection low, the blend-air door will move in one direction. When the A/C-heater control reverses the polarity of the voltage to the motor, the blend-air door moves in the opposite direction.

When the A/C-heater control makes the voltage to both connections high or both connections low, the blend-air door(s) stops and will not move. The A/C-heater control uses a pulse-count positioning system to monitor the operation and relative position of the blend door actuators and the blend-air doors. The A/C-heater control learns the blend-air doors stop positions during the calibration procedure and will store a diagnostic trouble code (DTC) for any problems it detects in the blend door actuator circuits.

The blend door actuator(s) is diagnosed using a scan tool. Refer to DIAGNOSIS AND TESTING .

The blend door actuator(s) cannot be adjusted or repaired and must be replaced if inoperative or damaged.

REMOVAL

Note. The dual zone system has two blend door actuators, one for the driver side blend-air door and one for the passenger side blend-air door.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 6

1. Disconnect and isolate the negative battery cable.
2. Remove the left side instrument panel silencer.
3. On RHD models, remove the glove box and glove box closeout. Refer to «GLOVE BOX, INSTRUMENT PANEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
4. On LHD models, remove the knee blocker. Refer to «PANEL, INSTRUMENT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
5. Remove the left side floor distribution duct from the HVAC air distribution housing (4). Refer to «DUCT, FLOOR DISTRIBUTION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
6. Remove the two screws (1) that secure the blend door actuator (3) to the left side of the air distribution housing.
7. Remove the blend door actuator from the air distribution housing.
8. Disconnect the wire harness connector (2) from the blend door actuator and remove the actuator from the vehicle.

Scheme 7

1. Disconnect and isolate the negative battery cable.
2. Remove the right side instrument panel silencer.
3. On LHD models, remove the glove box and glove box closeout. Refer to «GLOVE BOX, INSTRUMENT PANEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
4. Remove the right side floor distribution duct from the HVAC air distribution housing (4). Refer to «DUCT, FLOOR DISTRIBUTION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
5. Remove the two screws (1) that secure the blend door actuator (3) to the right side of the air distribution housing.
6. Remove the blend door actuator from the air distribution housing.
7. Disconnect the wire harness connector (2) from the blend door actuator and remove the actuator from the vehicle.

INSTALLATION

Note. LHD model shown in illustrations. RHD model similar.

Scheme 8

1. Position the blend door actuator (1) into the vehicle.
2. Install the blend door actuator onto the left side of the HVAC air distribution housing (2). If necessary, rotate the actuator slightly to align the splines on the actuator output shaft (4) with those on the blend door drive gear (3).
3. Install the two screws (1) that secure the blend door actuator (3) to the left side of the HVAC air distribution housing (4). Tighten the screws to 2 N.m (17 in. lbs.).
4. Connect the wire harness connector (2) to the blend door actuator.
5. Install the left side floor distribution duct. Refer to «DUCT, FLOOR DISTRIBUTION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
6. On LHD models, install the knee blocker. Refer to «PANEL, INSTRUMENT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
7. On RHD models, install the glove box closeout and the glove box. Refer to «GLOVE BOX, INSTRUMENT PANEL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
8. Install the left side instrument panel silencer.
9. Reconnect the negative battery cable.
10. Initiate the Actuator Calibration function using a scan tool. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-hvac-system/#heating-air-conditioning-electrical-diagnostics) .

Scheme 9

1. Position the blend door actuator (1) into the vehicle.
2. Install the blend door actuator onto the right side of the HVAC air distribution housing (4). If necessary, rotate the actuator slightly to align the splines on the actuator output shaft (2) with those on the blend door drive gear (3).
3. Install the two screws (1) that secure the blend door actuator (3) to the right side of the HVAC air distribution housing (4). Tighten the screws to 2 N.m (17 in. lbs.).
4. Connect the wire harness connector (2) to the blend door actuator.
5. Install the right side floor distribution duct. Refer to «DUCT, FLOOR DISTRIBUTION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
6. On LHD models, install the glove box closeout and the glove box. Refer to «GLOVE BOX, INSTRUMENT PANEL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
7. Install the right side instrument panel silencer.
8. Reconnect the negative battery cable.
9. Initiate the Actuator Calibration function using a scan tool. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-hvac-system/#heating-air-conditioning-electrical-diagnostics) .

The mode door actuator (1) is a reversible, 12 volt direct current (DC), servo motor. The mode door actuator is located on the upper right side of the HVAC air distribution housing and mechanically connected to the mode-air doors.

The mode door actuator is interchangeable with the actuators for the blend-air doors and the recirculation-air door. Each actuator is contained within an identical black molded plastic housing with an integral wire connector receptacle (2). Each actuator has an identical output shaft with splines (3) that connect it to its door linkage and three integral mounting tabs (4) that allow the actuator to be secured to the air distribution housing. The mode door actuator requires mechanical indexing to the mode-air door linkage and is electronically calibrated by the A/C-heater control.

The two mode door actuators are connected to the A/C-heater control through the vehicle electrical system by dedicated two-wire leads and connectors of the HVAC wire harness. The mode door actuators can move the panel/defrost/demist/floor air doors in two directions. When the A/C-heater control pulls the voltage on one side of the motor connection high and the other connection low, the mode-air doors will move in one direction. When the A/C-heater control reverses the polarity of the voltage to the motor, the mode-air doors moves in the opposite direction.

When the A/C-heater control makes the voltage to both connections high or both connections low, the mode-air door stops and will not move. The A/C-heater control uses a pulse-count positioning system to monitor the operation and relative position of the mode door actuators and the mode-air doors. The A/C-heater control learns the mode-air doors stop positions during the calibration procedure and will store a diagnostic trouble code (DTC) for any problems it detects in the mode door actuator circuits.

The mode door actuators are diagnosed using a scan tool. Refer to DIAGNOSIS AND TESTING .

The mode door actuators cannot be adjusted or repaired and must be replaced if inoperative or damaged.

Note. LHD model shown in illustration. RHD model similar.

Scheme 10

1. Disconnect and isolate the negative battery cable.
2. Remove the right side instrument panel silencer.
3. Remove the right side floor distribution duct from the HVAC air distribution housing. Refer to «DUCT, FLOOR DISTRIBUTION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
4. Remove the three screws (3) that secure the mode door actuator (2) to the mode door bracket (4) located on the right side of the air distribution housing.
5. Remove the mode door actuator from the air distribution housing.
6. Disconnect the wire harness connector (1) from the mode door actuator and remove the actuator from the vehicle.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 11

1. Position the mode door actuator (3) into the vehicle.
2. Install the mode door actuator onto the mode door linkage bracket (1) located on the right side of the HVAC air distribution housing. If necessary, rotate the actuator slightly to align the flat area of the splines on the actuator output shaft (4) with the flat area in the mode door drive gear (2).
3. Install the three screws (3) that secure the mode door actuator (2) to the mode door linkage bracket (4). Tighten the screws to 2 N.m (17 in. lbs.).
4. Connect the wire harness connector (1) to the mode door actuator.
5. Install the right side floor distribution duct. Refer to «DUCT, FLOOR DISTRIBUTION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
6. Install the right side instrument panel silencer.
7. Reconnect the negative battery cable.
8. Initiate the Actuator Calibration function using a scan tool. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-hvac-system/#heating-air-conditioning-electrical-diagnostics) .

The recirculation door actuator (1) is a reversible, 12 volt direct current (DC), servo motor. The recirculation door actuator is located on the HVAC air inlet housing and is directly connected to the pivot shaft of the recirculation-air door.

The recirculation door actuator is interchangeable with the actuators for the blend-air doors and the mode-air doors. Each actuator is contained within an identical black molded plastic housing with an integral wire connector receptacle (2). Each actuator has an identical output shaft with splines (3) that connect it to its door linkage and three integral mounting tabs (4) that allow the actuator to be secured to the air inlet housing. The recirculation door actuator requires mechanical indexing to the recirculation door pivot shaft and is electronically calibrated by the A/C-heater control.

The recirculation door actuator is connected to the A/C-heater control through the vehicle electrical system by a dedicated two-wire lead and connector of the HVAC wire harness. The recirculation door actuator can move the recirculation-air door in two directions. When the A/C-heater control pulls the voltage on one side of the motor connection high and the other connection low, the recirculation-air door will move in one direction. When the A/C-heater control reverses the polarity of the voltage to the motor, the recirculation-air door moves in the opposite direction.

When the A/C-heater control makes the voltage to both connections high or both connections low, the recirculation-air door stops and will not move. The A/C-heater control uses a pulse-count positioning system to monitor the operation and relative position of the recirculation door actuator and the recirculation-air door. The A/C-heater control learns the recirculation-air door stop positions during the calibration procedure and will store a diagnostic trouble code (DTC) for any problems it detects in the recirculation door actuator circuits.

The recirculation door actuator is diagnosed using a scan tool. Refer to DIAGNOSIS AND TESTING .

The recirculation door actuator cannot be adjusted or repaired and must be replaced if inoperative or damaged.

Note. LHD model shown in illustration. RHD model similar.

Scheme 12

1. Disconnect and isolate the negative battery cable.
2. Remove the passenger side instrument panel silencer.
3. Remove the passenger side floor distribution duct from the HVAC air distribution housing. Refer to «DUCT, FLOOR DISTRIBUTION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
4. Remove the two screws (1) that secure the recirculation door actuator (3) to the HVAC air inlet housing (4).
5. Remove the recirculation door actuator from the air inlet housing.
6. Disconnect the wire harness connector (2) from the recirculation door actuator and remove the actuator from the vehicle.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 13

1. Position the recirculation door actuator (1) into the vehicle.
2. Install the recirculation door actuator onto the HVAC air inlet housing (3). If necessary, rotate the actuator slightly to align the splines of the actuator output shaft (4) with those on the recirculation door pivot shaft (2).
3. Install the two screws (1) that secure the recirculation door actuator (3) to the HVAC air inlet housing (4). Tighten the screws to 2 N.m (17 in. lbs.).
4. Connect the wire harness connector (2) to the recirculation door actuator.
5. Install the passenger side floor distribution duct. Refer to «DUCT, FLOOR DISTRIBUTION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
6. Install the passenger side instrument panel silencer.
7. Reconnect the negative battery cable.
8. Initiate the Actuator Calibration function using a scan tool. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-hvac-system/#heating-air-conditioning-electrical-diagnostics) .

Scheme 14

The A/C-heater control (1) for the Automatic Temperature Control (ATC) dual zone heating-A/C system allows both the driver and the front seat passenger the ability to individually regulate air temperature for their side of the vehicle. All controls are identified by International Standardization Organization (ISO) graphic symbols.

The ATC A/C-heater control and integral computer is located in the center of the instrument panel and contains

1. a push button A/C on/off control (2). An ISO Snowflake symbol appears in the Vacuum-Flourescent (VF) digital display (3) when the A/C system is in operation, whether under manual or Auto mode.
2. a push button front window defogger control (4). An indicator lamp illuminates in the control when selected manually and an ISO symbol appears in the VF digital display when selected by Auto mode.
3. four push button temperature controls (5 and 15) to select the front comfort temperatures from 15° to 31° C (60° to 88° F). Comfort temperatures for each zone are shown in the VF digital display. If the set temperatures are 15° C (60° F) and is adjusted lower, the A/C-heater control will attempt to achieve the lowest temperature possible, but the display will show LO. If the set temperatures are 31° C (88° F) and is adjusted up, the A/C-heater control will attempt to achieve the highest temperature possible, but the display will show HIGH. Temperatures can be displayed in either Metric or Fahrenheit, which is selected from the overhead console.
4. a push button rear window defogger on/off control (6). An indicator lamp illuminates in the control when selected. The indicator lamp illuminates in the control even with the heating-A/C system turned off. Refer to «OPERATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/windows/#heated-glass-service-information__operation) .
5. a push button automatic mode control (7) to set the heating-A/C system to Auto mode. AUTO appears in the VF digital display when the system is in Auto mode.
6. two push button front heated seat controls (8 and 11). Each control has two indicator lamps that illuminate, depending on seat temperature selected. Refer to «OPERATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/seats/#heated-seats-service-information__operation) .
7. a rotary control knob for fan speed selection and turning the heating-A/C system off (9).
8. a cab temperature sensor (10) is located in the center of the A/C-heater control. The sensor detects thermal radiation emitted by the front seat occupants and their surroundings.
9. a push button mode control (12) to override the Auto mode. An ISO mode symbol appears in the VF digital display to indicate the current mode setting when selected manually or by Auto mode. Auto mode provides variable air recirculation through a broad range of high temperature and humidity conditions.
10. a push button air recirculation control (13). The Recirculation button contains an LED that illuminates when the recirculation function is manually activated. The ATC A/C-heater control computer logic provides variable air recirculation through a broad range of temperature and humidity conditions.
11. a push button synchronize control (14) that automatically adjusts the temperature of the front passenger comfort zone to the drivers comfort zone temperature. An LED illuminates in the SYNC button when the SYNC function is manually activated. SYNC appears in the VF digital display when the system is synchronized, whether under manual or Auto mode.
12. illumination lamps for backlighting of the ATC A/C-heater control.
13. computer logic that remembers the settings of the controls when the ignition is turned off, and retains those settings after a restart. If the system is off when the ignition is turned off, it will be off when the engine is restarted, etc.

The A/C-heater control for the ATC dual zone heating-A/C system is diagnosed using a scan tool. Prior to replacing an A/C-heater control, check for any Diagnostic Trouble Codes (DTCs) related to the heating-A/C system and initiate the Actuator Calibration function to verify that the concern is not a heating-A/C system calibration issue. Refer to STANDARD PROCEDURE .

The A/C-heater control cannot be repaired or adjusted and must be replaced if inoperative or damaged.

The ATC A/C-heater control utilizes integrated circuitry and information carried on the Controller Area Network (CAN) bus to monitor many sensors and switch inputs throughout the vehicle. In response to these inputs, the internal circuitry and programming of the ATC A/C-heater control allow it to control electronic functions and features of the ATC heating-A/C system.

Some of the inputs received by the A/C-heater control of the ATC heating-A/C system on the CAN bus are as follows

1. A/C Clutch Engage
2. Ambient Air Temperature
3. A/C-heater control backlight dimming
4. Engine Coolant Temperature
5. Engine Speed
6. Refrigerant Pressure
7. Electrical System Voltage
8. Vehicle Identification Number
9. Vehicle Odometer
10. Vehicle Speed

Some of the messages broadcasted by the A/C-heater control of the ATC heating-A/C system on the CAN bus are as follows

1. A/C Request
2. EBL Status
3. Heated/Ventilated Seat Select

Scheme 15

The A/C-heater control (1) for the Manual Temperature Control (MTC) dual zone heating-A/C system allows both the driver and the front seat passenger the ability to individually regulate air temperature for their side of the vehicle. All controls are identified by International Standardization Organization (ISO) graphic symbols.

The MTC A/C-heater control and integral computer is located in the instrument panel and contains

1. two rotary control knobs for individual driver and front seat passenger temperature control of the discharged air (2).
2. five push buttons for mode control of the discharged air (3, 4, 9, 10 and 11). Each mode control button contains an LED that illuminates when manually activated.
3. a push button rear window defogger on/off control (5). The defogger button contains an LED that illuminates when the rear window defogger system is in operation.
4. a push button air recirculation control (6). The Recirculation button contains an LED that illuminates when the recirculation function is manually activated.
5. a rotary control knob for fan speed selection and turning the heating-A/C system off (7).
6. a push button A/C on/off control (8). The A/C button contains an LED that illuminates when the A/C system is in operation.

Prior to replacing an A/C-heater control, check and repair any Diagnostic Trouble Codes (DTCs) related to the heating-A/C system and initiate the Actuator Calibration function. Refer to STANDARD PROCEDURE .

The MTC A/C-heater control cannot be repaired or adjusted and must be replaced if inoperative or damaged.

Note. Take the proper precautions to protect the face of the A/C-heater control, center bezel and the instrument panel switch pod from cosmetic damage while performing this procedure.

Scheme 16

1. Disconnect and isolate the negative battery cable.
2. Remove the instrument panel center bezel (3) and place it on a workbench. Refer to «BEZEL, INSTRUMENT PANEL, CENTER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
3. Remove the four screws (2 and 4) that secure the A/C-heater control (1) to the center bezel and remove the control.

Note. Take the proper precautions to protect the face of the A/C-heater control, center bezel and the instrument panel switch pod from cosmetic damage while performing this procedure.

1. Position the A/C-heater control (1) into the instrument panel center bezel (3).
2. Install the four screws (2 and 4) that secure the A/C-heater control to the center bezel. Tighten the screws to 2 N.m (17 in. lbs.).
3. Install the instrument panel center bezel. Refer to «BEZEL, INSTRUMENT PANEL, CENTER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
4. Reconnect the negative battery cable.
5. Initiate the Actuator Calibration function using a scan tool. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-hvac-system/#heating-air-conditioning-electrical-diagnostics) .

Note. Automatic Temperature Control (ATC) shown in illustration. Manual Temperature Control (MTC) similar.

Scheme 17

A blower motor power module is used on this model when equipped with either the Automatic Temperature Control (ATC) heating-A/C system, or the Manual Temperature Control (MTC) heating-A/C system.

The blower motor power module is mounted to the passenger side of the HVAC housing, near the blower motor. The blower motor power module consists of a molded plastic housing with mounting plate and two integral connector receptacles (1). Concealed behind the mounting plate is the power module electronic circuitry and a multiple, cylindrical finned heat sink (2).The blower motor power module is accessed for service from under the instrument panel.

The blower motor power module is connected to the vehicle electrical system through a dedicated lead and connector of the instrument panel wire harness. A second lead and connector of the instrument panel wire harness is connected to the blower motor.

On the Automatic Temperature Control (ATC) system, the blower motor power module allows the microprocessor-based A/C-heater control to calculate and provide infinitely variable blower motor speeds based upon either manual blower switch input or the ATC programming.

On the Manual Temperature Control (ATC) system, the blower motor power module allows the microprocessor-based A/C-heater control to provide an infinite amount of blower motor speeds throughout its operating range, based upon blower switch input.

Both the ATC and MTC systems use a Pulse Width Modulated (PWM) circuit strategy. PWM voltage is applied to a comparator circuit which compares the PWM signal voltage to the blower motor feedback voltage. The resulting output drives the power module circuitry, which provides a linear output voltage to change or maintain the desired blower speed.

The blower motor power module is diagnosed using a scan tool. Refer to DIAGNOSIS AND TESTING .

The blower motor power module cannot be adjusted or repaired must be replaced if inoperative or damaged.

Note. Automatic Temperature Control (ATC) shown in illustration. Manual Temperature Control (MTC) similar.

Scheme 18

Note. Illustration shown with instrument panel removed from view for clarity.

Scheme 19

Scheme 20

1. Disconnect and isolate the negative battery cable.
2. Remove the passenger side instrument panel silencer.
3. Disconnect the passenger side floor ducts (1) from the HVAC housing (2).
4. Disconnect the two wiring harness connectors (1) from the blower motor power module (2).
5. Remove the two screws (13) that secure the blower motor power module (2) to the HVAC housing (3).
6. Remove the blower motor power module from the HVAC housing.

Note. Automatic Temperature Control (ATC) shown in illustration. Manual Temperature Control (MTC) similar.

1. Position the blower motor power module (2) onto the HVAC housing (3).
2. Install the two screws (1) that secure the blower motor power module to the HVAC housing. Tighten the screws to 2 N.m (17 in. lbs.).
3. Connect the two wire harness connectors (1) to the blower motor power module (2). NOTE: Illustration shown with instrument panel removed from view for clarity.
4. Connect the passenger side floor ducts (1) to the HVAC housing (2).
5. Install the passenger side instrument panel silencer.
6. Reconnect the negative battery cable.

Scheme 21

The ambient air temperature sensor is a variable resistor that monitors the air temperature outside of the vehicle. The Automatic Temperature Control (ATC) system uses the ambient air temperature sensor data to help maintain optimum cabin temperature levels. The ambient air temperature sensor is mounted to the condenser/radiator closeout, behind the grille.

The ambient air temperature sensor is a variable resistor that operates on a 5 volt Direct Current (DC) reference signal sent by the Totally Integrated Power Module (TIPM). The ambient air temperature sensor is connected to the TIPM through a two-wire lead and connector of the vehicle wire harness. The ambient air temperature sensor changes its internal resistance in response to changes in the outside air temperature, which either increases or decreases the reference signal voltage read by the TIPM. The TIPM converts and broadcasts the sensor data over the Controller Area Network (CAN) bus, where it is read by the Automatic Temperature Control (ATC) A/C heater control, Powertrain Control Module (PCM) and other vehicle control modules.

The ambient air temperature sensor is diagnosed using a scan tool. Refer to appropriate Electrical Diagnostic article .

The ambient air temperature sensor cannot be adjusted or repaired and must be replaced if inoperative or damaged.

Scheme 22

1. Disconnect and isolate the negative battery cable.
2. Remove the grille. Refer to «GRILLE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
3. Disconnect the wire harness connector (4) from the ambient air temperature sensor (2).
4. Remove the push-pin fastener (1) that secures the ambient air temperature sensor to the condenser/radiator closeout (3) and remove the sensor.

1. Position the ambient air temperature sensor (2) onto the condenser/radiator closeout (3) and install the push-pin fastener (1).
2. Connect the wire harness connector (4) to the ambient air temperature sensor.
3. Install the grille. Refer to «GRILLE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
4. Reconnect the negative battery cable.

Note. Cutaway view of HVAC housing shown in illustration for clarity.

Scheme 23

The evaporator temperature sensor (1) measures the temperature of the conditioned air downstream of the A/C evaporator (2). The evaporator temperature sensor is an electrical thermistor within a molded plastic case that is inserted into the HVAC housing (3) near the coldest point of the A/C evaporator. Two terminals within the connector receptacle (4) connect the sensor to the vehicle electrical system.

The external location of the evaporator temperature sensor allows the sensor to be removed and installed without disturbing the refrigerant in the A/C system.

The evaporator temperature sensor monitors the temperature of the conditioned air downstream of the A/C evaporator and supplies an input signal to the A/C heater control. The A/C heater control uses the evaporator temperature sensor input signal to optimize A/C system performance and to protect the A/C system from evaporator freezing. The evaporator temperature sensor will change its internal resistance in response to the temperatures it monitors and is connected to the A/C heater control through sensor ground circuit and a 5 volt Direct Current (DC) reference signal circuit. As the temperature of the A/C evaporator decreases, the internal resistance of the evaporator temperature sensor decreases.

The A/C heater control uses the monitored voltage reading as an indication of evaporator temperature. The A/C heater control is programmed to respond to this input by requesting the Powertrain Control Module (PCM) to cycle the A/C clutch as necessary to optimize A/C system performance and to protect the A/C system from evaporator freezing.

The evaporator temperature sensor is diagnosed using a scan tool. Refer to DIAGNOSIS AND TESTING .

The evaporator temperature sensor cannot be adjusted or repaired and must be replaced if inoperative or damaged.

Note. LHD model shown in illustration. RHD model similar.

Scheme 24

1. Disconnect and isolate the negative battery cable.
2. Remove the right side instrument panel silencer.
3. Disconnect the wire harness connector (1) from the evaporator temperature sensor (2) located on the right side of the HVAC housing (3).
4. Remove the evaporator temperature sensor from the HVAC housing.

Note. LHD model shown in illustration. RHD model similar.

1. Install the evaporator temperature sensor (1) into the right side of the HVAC housing (3). Make sure that the sensor retaining clips are fully engaged in the housing.
2. Connect the wire harness connector (2) to the evaporator temperature sensor.
3. Install the right side instrument panel silencer
4. Reconnect the negative battery cable.

Note. Typical sun sensor assembly shown in illustration.

Scheme 25

The Automatic Temperature Control (ATC) heating-A/C system uses a sun sensor (1) to measure sun light intensity. The sun sensor incorporates two sun load sensors (2) within a molded plastic case which is mounted to the instrument panel and a clear lens (3) that protrudes through the defroster grille. The wire harness receptacle (4) connects the sun sensor to the vehicle electrical system.

The ATC heating-A/C system uses two sun sensors to balance the system in response to side-to-side variations in sun light intensity. Passengers in sun and shadow require different functional settings because they experience very different temperatures. The sun sensor assembly provides data to the A/C heater control to help determine proper mode and blend-air door positions and blower motor speeds. The sun sensors are not thermistor type sensors, but rather photo diodes. For this reason the sun sensors responds to sun light intensity rather than temperature. The sun sensor assembly is also used to sense day and night conditions for automatic headlight control on MTC equipped vehicles.

The sun sensor is diagnosed using a scan tool. Refer to DIAGNOSIS AND TESTING .

The sun sensor assembly cannot be adjusted or repaired and must be replaced if inoperative or damaged.

SUN SENSOR

The sun sensor assembly is located so that the sun rays will hit the sensors in the same way that it will hit the driver and the passenger. If the vehicle exhibits a lack of passenger comfort in sunny weather such as in the early afternoon, inspect the area around the sun sensor on top of the dash panel. It is important that the area of the sun sensor be unobstructed from plain view. Check for the following

1. Windshield wipers are properly adjusted.
2. Sun sensor is properly installed. Refer to «SENSOR, SUN, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
3. Any stickers on the windshield are not directly in front of the sun sensor.
4. Any items laying on top of the instrument panel are not covering the sun sensor.

The A/C-heater control continually monitors the sun sensor circuits and will store Diagnostic Trouble Codes (DTCs) for any problem it detects. The sun sensor can be tested in the vehicle with a scan tool. Refer to DIAGNOSIS AND TESTING .

Note. Take the proper precautions to protect the face of the defroster grille from cosmetic damage while performing this procedure.

Scheme 26

Scheme 27

1. Disconnect and isolate the negative battery cable.
2. Using Trim Stick (special tool #C-4755, Trim Stick) or equivalent, remove the defroster grille (3) from the instrument panel and disconnect the wire harness connector (2) from the sun sensor (1).
3. Place the defroster grill (2) on a workbench.
4. Disengage the two retaining tabs (1) that secure the sun sensor (3) to the back side of the defroster grille and remove the sensor.

Note. Take the proper precautions to protect the face of the defroster grille from cosmetic damage while performing this procedure.

1. Align the tab on the sun sensor (3) with the slot in the opening in the defroster grille (2) and install the sensor onto the grille. Make sure that the two sensor retaining tabs (1) are fully engaged to the defroster grille.
2. Position the defroster grille (3) to the top of the instrument panel and connect the wire harness connector (2) to the sun sensor (1).
3. Carefully install the defroster grille onto the instrument panel. Make sure the retaining tabs on the defroster grille are fully engaged to the instrument panel.
4. Reconnect the negative battery cable.

Scheme 28

The A/C pressure transducer (1) is a switch that is installed on a fitting located on the A/C discharge line. An internally threaded fitting on the A/C pressure transducer connect it to the externally threaded Schrader-type fitting on the A/C discharge line. A rubber O-ring seals the connection between the A/C pressure transducer and the discharge line fitting. The A/C pressure transducer is connected to the vehicle electrical system by a molded plastic connector with three terminals.

The A/C pressure transducer monitors the pressures in the high side of the A/C refrigerant system through its connection to a fitting on the A/C discharge line, and its internal resistance changes in response to the pressures it monitors. The Powertrain Control Module (PCM) provides a 5 volt Direct Current (DC) reference signal and a sensor ground to the A/C pressure transducer, then monitors the output voltage of the transducer on a sensor return circuit to determine refrigerant pressure. The PCM is programmed to respond to this and other sensor inputs by controlling the operation of the A/C clutch and the radiator cooling fan to help optimize A/C system performance and to protect the A/C system components from damage. The PCM will disengage the A/C clutch when high side pressure rises above 3219 kPa (476 psi) and re-engage the clutch when high side pressure drops below 2937 kPa (426 psi). The A/C pressure transducer will also disengage the A/C clutch if the high side pressure drops below 110 kPa (16 psi) and will re-engage the clutch when the high side pressure rises above 220 kPa (32 psi). When the refrigerant pressure rises above 1655 kPa (240 psi), the PCM will actuate the cooling fan. The A/C pressure transducer signal to the PCM also prevents the A/C clutch from engaging when ambient temperatures are below about 10° C (50° F), due to the pressure/temperature relationship of the refrigerant.

A Schrader-type valve in the A/C discharge line fitting permits the A/C pressure transducer to be removed or installed without disturbing the refrigerant in the A/C system.

The A/C pressure transducer is diagnosed using a scan tool. Refer to appropriate Electrical Diagnostic article .

The A/C pressure transducer cannot be adjusted or repaired and must be replaced if inoperative or damaged.

Note. It is not necessary to discharge the refrigerant system to replace the A/C pressure transducer.

Scheme 29

Note. Typical A/C pressure transducer and refrigerant line shown in illustration.

1. Disconnect and isolate the negative battery cable.
2. Disconnect the wire harness connector (1) from the A/C pressure transducer (2) located on the A/C discharge line (3).
3. Remove the A/C pressure transducer from the fitting on the A/C discharge line and remove and discard the O-ring seal (4).

Note. Use only the specified O-ring as it is made of special material for R-134a. Use only refrigerant oil of the type required for the A/C compressor.

Note. Typical A/C pressure transducer and refrigerant line shown in illustration.

1. Lubricate a new rubber O-ring seal (4) with clean refrigerant oil and install it onto the discharge line fitting (3).
2. Install the A/C pressure transducer (2) onto the A/C discharge line. Tighten the A/C pressure transducer to 5.1 N.m (45 in. lbs.).
3. Connect the wire harness connector (1) to the A/C pressure transducer.
4. Reconnect the negative battery cable.

Scheme 30

Note. LHD model shown in illustration. RHD model similar.

The defroster outlets receive airflow from the HVAC housing through a molded plastic defroster duct (2) that is attached to the underside of the instrument panel cover (1).

The defroster duct is integral to the instrument panel cover and is not serviced separately.

Note. LHD model shown in illustrations. RHD model similar.

FRONT DUCT

Note. Take the proper precautions to protect the floor console from cosmetic damage while performing this procedure.

Scheme 31

1. Disconnect and isolate the negative battery cable.
2. Remove the floor console from the passenger compartment and place it on a workbench. Refer to «CONSOLE, FLOOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
3. Disengage the four push-pin retainers (1) that secure the front console duct (2) to the floor console.
4. Disconnect the front console duct from the rear console duct (3) and remove the front console duct.

REAR DUCT

Note. Take the proper precautions to protect the floor console rear trim panel from cosmetic damage while performing this procedure.

Scheme 32

Scheme 33

1. Disconnect and isolate the negative battery cable.
2. Remove the floor console rear trim panel (4) from the back of the floor console using Trim Stick (special tool #C-4755, Trim Stick) or equivalent. Disconnect any necessary electrical connectors and place the trim panel on a workbench.
3. Remove the six screws (1 and 3) that secure floor console rear duct (2) to the floor console rear trim panel (4). NOTE: If the foam seal on the console rear duct is deformed or damaged, the seal must be replaced.
4. Remove the floor console rear duct from the floor console rear trim panel.
5. If required, using Trim Stick (special tool #C-4755, Trim Stick) (1) or equivalent, gently pry on the air outlet barrel(s) (3) until the barrel retainers release from the pivot shafts on the console rear duct (2). Rotate the air outlet barrel(s) as necessary.

Note. LHD model shown in illustrations. RHD model similar.

Note. Take the proper precautions to protect the floor console from cosmetic damage while performing this procedure.

Note. If the foam seal on the console rear duct is deformed or damaged, the seal must be replaced.

1. Position the floor console front duct (2) to the floor console and connect it to the rear duct (3).
2. Install the four push-pin retainers (1).
3. Install the floor console. Refer to «CONSOLE, FLOOR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
4. Reconnect the negative battery cable.

Note. Take the proper precautions to protect the floor console rear trim panel from cosmetic damage while performing this procedure.

Scheme 34

1. If required, position the air outlet barrel(s) (1) into the console rear duct (2) and gently push the barrel(s) into the duct, until the barrel snaps into position on the pivot shafts. Make sure each barrel is square in the duct opening and moves freely on the pivot shafts. NOTE: If the foam seal on the console rear duct is deformed or damaged, the seal must be replaced.
2. Install the floor console rear duct (2) onto the floor console rear trim panel (4).
3. Install the six screws (1 and 3) that secure floor console rear duct to the floor console rear trim panel. Tighten the screws securely.
4. Install the floor console rear trim panel (4) onto the back of the floor console. Be sure to connect any necessary electrical connectors and properly align the console ducts.
5. Reconnect the negative battery cable.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 35

Note. Illustration shown with instrument panel removed from view for clarity.

1. Remove the left side instrument panel silencer.
2. Remove the push pin (3) that secures the left side floor ducts (1) to the instrument panel.
3. Disconnect the left side floor ducts from the HVAC housing (2).

RIGHT SIDE

Note. Illustration shown with instrument panel removed from view for clarity.

1. Remove the right side instrument panel silencer.
2. Disconnect the right side floor ducts (1) from the HVAC housing (2).

Note. LHD model shown in illustrations. RHD model similar.

LEFT SIDE

Note. Illustration shown with instrument panel removed from view for clarity.

1. Connect the left side floor ducts (1) to the HVAC housing (2). Make sure the ducts are fully engaged to the HVAC housing and each other.
2. Install the push pin (3) that secures the left side floor ducts to the instrument panel.
3. Install the left side instrument panel silencer.

Note. Illustration shown with instrument panel removed from view for clarity.

1. Connect the right side floor ducts (1) to the HVAC housing (2). Make sure the ducts are fully engaged to the HVAC housing and each other.
2. Install the right side instrument panel silencer.

Note. Take the proper precautions to protect the face of the instrument panel cover from cosmetic damage while performing this procedure.

Note. It is not necessary to remove the air outlets to service the instrument panel duct. Illustrations shown with air outlets removed from view for clarity.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 36

Scheme 37

1. Remove the instrument panel cover (4) and place it on a workbench. Refer to «COVER, INSTRUMENT PANEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
2. Remove the instrument panel demister ducts. Refer to «DUCT, INSTRUMENT PANEL DEMISTER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
3. Remove the screws (1, 2 and 5) that secure the left side of the instrument panel duct (3) to the instrument panel cover.
4. Remove the screws (1, 2 and 5) that secure the right side of the instrument panel duct (3) to the instrument panel cover (4). NOTE: If the foam seal on an air outlet is deformed or damaged, the seal must be replaced.
5. Remove the instrument panel duct from the instrument panel cover.

Note. Take the proper precautions to protect the face of the instrument panel cover from cosmetic damage while performing this procedure.

Note. Illustrations shown with air outlets removed from view for clarity.

Note. LHD model shown in illustrations. RHD model similar.

1. Position the instrument panel duct (2) to the instrument panel cover (4). NOTE: If the foam seal on an air outlet is deformed or damaged, the seal must be replaced.
2. Connect the instrument panel duct the instrument panel air outlets. Be sure the duct is properly aligned and connected to both outlets.
3. Install the screws (1, 2 and 5) that secure the right side of the instrument panel duct (3) to the instrument panel cover (4). Tighten the screws securely.
4. Install the screws (1, 2 and 5) that secure the left side of the instrument panel duct (3) to the instrument panel cover (4). Tighten the screws securely.
5. Install the instrument panel demister ducts. Refer to «DUCT, INSTRUMENT PANEL DEMISTER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
6. Install the instrument panel cover. Refer to «COVER, INSTRUMENT PANEL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .

Note. Take the proper precautions to protect the face of the instrument panel cover from cosmetic damage while performing this procedure.

Note. The center demister duct is integral to the instrument panel cover and is not serviced separately.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 38

Scheme 39

1. Remove the instrument panel cover and place it on a workbench. Refer to «COVER, INSTRUMENT PANEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
2. Remove the screw (2) that secures the left side instrument panel demister duct (3) to the instrument panel cover. NOTE: If the foam seal on a demister duct is deformed or damaged, the seal must be replaced.
3. Disconnect the left side instrument panel demister duct from the center demister duct (1).
4. Remove the screw (3) that secures the right side instrument panel demister duct (2) to the instrument panel cover NOTE: If the foam seal on a demister duct is deformed or damaged, the seal must be replaced.
5. Disconnect the right side instrument panel demister duct from the center demister duct (1).

Note. Take the proper precautions to protect the face of the instrument panel cover from cosmetic damage while performing this procedure.

Note. LHD model shown in illustrations. RHD model similar.

Note. If the foam seal on an air outlet is deformed or damaged, the seal must be replaced.

1. Connect the right side instrument panel demister duct (2) to the center demister duct (1).
2. Install the screw (3) that secures the right side instrument panel demister duct to the center duct. Tighten the screw securely. NOTE: If the foam seal on an air outlet is deformed or damaged, the seal must be replaced.
3. Connect the left side instrument panel demister duct (3) to the center demister duct (1).
4. Install the screw (2) that secures the left side instrument panel demister duct to the center duct. Tighten the screw securely.
5. Install the instrument panel cover. Refer to «COVER, INSTRUMENT PANEL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .

Note. Typical filter shown in illustration.

Scheme 40

Most models are equipped with a particulate air filter (1) that helps purify the outside air entering the HVAC housing. The filter is mounted in the passenger compartment, behind the glove box bin.

The filter should be replaced at least once a year or every 24, 000 km (15, 000 miles) and checked if heating-A/C system performance seems lower than expected. The particulate air filter is labeled with an arrow (2) to indicate the direction of air flow through the filter.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 41

Scheme 42

Scheme 43

1. Remove the glove box bin. Refer to «GLOVE BOX, INSTRUMENT PANEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
2. Remove the glove box shelf (2) from the instrument panel (1). Carefully pull the shelf rearward to disengage the four retainers.
3. Disengage the retaining tab (1) that secures the particulate air filter cover (2) to the HVAC housing.
4. Open the particulate air filter cover to disengage the hinge clips (3) and remove the cover.
5. Remove the particulate air filter (1) from the HVAC housing (2) by pulling the filter element straight rearward, out of the housing.

Note. The particulate air filter is labeled with an arrow to indicate air flow direction through the filter. Make sure to properly install the particulate air filter. Failure to properly install the filter will result in the need to replace the filter sooner than required by design.

Note. LHD model shown in illustrations. RHD model similar.

1. Install the particulate air filter (1) into the filter opening in the HVAC housing (2). Insert the particulate air filter directly into the housing with the arrows on the filter (3) pointing to the floor.
2. Position the particulate air filter cover (2) to the HVAC housing and engage the hinge clips (3).
3. Close the particulate air filter cover and engage the retaining tab (1). Make sure the retaining tab and hinges are fully engaged.
4. Install the glove box shelf (2). Make sure the four retainers are fully engaged to the instrument pane (1).
5. Install the glove box bin. Refer to «GLOVE BOX, INSTRUMENT PANEL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .

Note. LHD model shown in illustration. RHD model similar.

Scheme 44

All models are equipped with a common HVAC housing assembly that combines A/C and heating capabilities into a single unit mounted within the passenger compartment. The HVAC housing assembly consists of three separate housings

1. Air inlet housing (1) - The air inlet housing is mounted to the passenger side end of the HVAC housing and contains the recirculation-air door and actuator.
2. HVAC housing (2) - The HVAC housing is mounted behind the instrument panel and contains the A/C evaporator, blower motor resistor block or power model (depending on application) and the blower motor. The HVAC housing consists of a upper and a lower housing that are attached together and has mounting provisions for the air inlet housing and air distribution housing.
3. Air distribution housing (3) - The air distribution housing is mounted to the rear of the HVAC housing and contains the heater core, blend-air doors and actuators, mode-air doors and actuator, door linkages and the evaporator temperature sensor. When the vehicle is equipped with the 3.0L diesel engine, the air distribution housing also contains the electric Positive Temperature Coefficient (PTC) heater unit.

The heating-A/C system is a blend-air type system. The blend-air doors control the amount of conditioned air that is allowed to flow through, or around the heater core. The two available dual zone heating A/C systems use two blend door actuators.

The A/C system is designed for the use of a non-CFC, R-134a refrigerant and uses an A/C evaporator to cool and dehumidify the incoming air prior to blending it with the heated air. A temperature control determines the discharge air temperature by operating the blend door actuators, which moves the blend-air doors. This allows an almost immediate control of the output air temperature of the system. The two mode door actuators operate the mode-air doors which direct the flow of the conditioned air out the various air outlets, depending on the mode selected. The recirculation door actuator operates the recirculation-air door which closes off the fresh air intake and recirculates the air already inside the vehicle. The blower motor controls the velocity of air flowing through the HVAC housing assembly by spinning the blower wheel within the HVAC housing at the selected speed by use of a blower motor resistor or power model, depending on heater-A/C system application.

The HVAC housing must be removed from the vehicle and disassembled for service of the A/C evaporator. The air distribution housing must be removed from the HVAC housing and disassembled for service of the mode-air and blend-air doors. The air inlet housing must be removed from HVAC housing and disassembled for service of the recirculation-air door.

HOUSING-AIR DISTRIBUTION

Note. The air distribution housing must be removed from the HVAC housing and disassembled for service of the mode-air and blend-air doors.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 45

Scheme 46

Scheme 47

Scheme 48

1. Remove the HVAC housing assembly and place it on a workbench. Refer to «HOUSING, HVAC, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
2. Remove the floor distribution ducts from the air distribution housing. Refer to «DUCT, FLOOR DISTRIBUTION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
3. Disconnect the wire harness from the mode door actuator, both blend door actuators and the evaporator temperature sensor and position the harness out of the way. Refer to «ACTUATOR, MODE DOOR»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) and «ACTUATOR, BLEND DOOR»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) and «SENSOR, EVAPORATOR TEMPERATURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . NOTE: If the foam seal at the front of the HVAC housing is deformed or damaged, it must be replaced.
4. Carefully remove the foam seal (1).
5. Remove the two screws (4) that secure the lower part of the flange (3) to the upper part of the HVAC housing (2).
6. Position the lower part of the flange (1) out of the way.
7. Remove the screw (5) that secures the heater core retaining bracket (4) to the air distribution housing (3) and position the bracket out of the way. NOTE: If the foam seal around the heater core is deformed or damaged, it must be replaced.
8. Carefully pull the heater core (4) out of the air distribution housing.
9. Remove the two screws (4) that secure the air distribution housing (2) to the HVAC housing (3).
10. Carefully disengage the two retaining tabs (1) that secure the air distribution housing to the HVAC housing.
11. Tilt the air distribution housing (2) downward to disengage the two tab-and-slot type retainers (1) from the bottom of the HVAC housing (3).
12. Remove the air distribution housing from the HVAC housing.
13. If required, disassemble the air distribution housing. Refer to «HOUSING, HVAC, DISASSEMBLY»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .

HOUSING-AIR INLET

Note. The air inlet housing must be removed from HVAC housing and disassembled for service of the recirculation-air door.

Note. LHD model shown in illustration. RHD model similar.

Scheme 49

Scheme 50

1. Remove the HVAC housing assembly and place it on a workbench. Refer to «HOUSING, HVAC, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
2. Disconnect the wire harness connector from the recirculation door actuator (1).
3. Remove the two screws (4) that secure the left side of the air inlet housing (2) to HVAC housing (3).
4. Remove the one screw (1) that secures the right side of the air inlet housing (2) to HVAC housing (3).
5. Tilt the left side of the air inlet housing upward to disengage the two tab-and-slot type retainers (4) located at the right side of the housings and remove the inlet housing from the HVAC housing. NOTE: If the foam seal on the air inlet housing is deformed or damaged, it must be replaced.
6. If required, disassemble the air inlet housing. Refer to «HOUSING, HVAC, DISASSEMBLY»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .

HOUSING-HVAC ASSEMBLY

Note. The HVAC housing assembly must be removed from the vehicle and disassembled for service of the air inlet housing, air distribution housing and the A/C evaporator.

Note. Take the proper precautions to protect the front face of the instrument panel from cosmetic damage while performing this procedure.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

1. Disconnect and isolate the negative battery cable.
2. Recover the refrigerant from the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
3. Drain the engine cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
4. Remove the passenger side instrument panel silencer.
5. Remove the glove box, glove box shelf and the trim panel, located behind the glove box. Refer to «GLOVE BOX, INSTRUMENT PANEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
6. Remove the nut (1) that secures the passenger side end of the HVAC housing (3) to the instrument panel support (2). NOTE: Illustration shown with instrument panel removed from view for clarity.
7. Disconnect the passenger side floor ducts (1) from the HVAC housing (2).
8. Disconnect the wiring harness connectors (1) from the blower motor power module (2).
9. Disconnect the wire harness connector from the Passive Entry Module (PEM). Refer to «MODULE, PASSIVE ENTRY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) .
10. Disconnect the wiring harness connector (1) from the blower motor (2).
11. Disconnect the wiring harness connector (2) from the recirculation door actuator (3).
12. Disconnect the wiring harness connector (1) from the mode door actuator (3).
13. Disconnect the wiring harness connector (2) from the right side blend door actuator (3).
14. Disconnect the wiring harness connector (2) from the evaporator temperature sensor (1).
15. Remove the front floor console. Refer to «CONSOLE, FLOOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
16. Remove the radio. Refer to «RADIO, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/entertainment-systems/#audio-and-video-service-information) .
17. Remove the bin from the center of the instrument panel.
18. Remove the four nuts (1) that secure the HVAC housing to the center of the instrument panel support. NOTE: Illustration shown with instrument panel removed from view for clarity.
19. Remove the driver side instrument panel silencer.
20. Remove the push pin (3) that secures the driver side floor ducts (1) to the instrument panel.
21. Disconnect the driver side floor ducts from the HVAC housing (2).
22. Disconnect the wiring harness connector (2) from the left side blend door actuator (3).
23. Remove the instrument panel. Refer to «PANEL, INSTRUMENT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
24. Remove the windshield wiper arms and wiper module. Refer to «LINKAGE, WIPER ARM, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/wiperwasher-systems/#wiper-system-washer-system-service-information) .
25. Remove the cowl extension silencer. Refer to «SILENCER, COWL EXTENSION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
26. Remove the two nuts (2) that secure the HVAC air inlet duct (1) to the engine compartment side of the dash panel (3) and remove the duct.
27. Disconnect the A/C liquid line and the A/C suction line from the A/C expansion valve. Refer to «VALVE, A/C EXPANSION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
28. Disconnect the heater hoses from the heater core tubes.
29. Remove the two nuts (1) that secure the HVAC housing assembly to the engine compartment side of the dash panel (2).
30. Lift the HVAC housing assembly upwards so that the condensate drain tube clears the floor panel and remove the HVAC housing assembly from the passenger compartment.
31. If required, disassemble the HVAC housing assembly. Refer to «HOUSING, HVAC, DISASSEMBLY»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .

Note. The air distribution housing must be removed from the HVAC housing and disassembled for service of the mode-air and blend-air doors.

Scheme 56

Scheme 57

Scheme 58

Scheme 59

Scheme 60

Scheme 61

Scheme 62

Scheme 63

Scheme 64

Scheme 65

Scheme 66

Scheme 67

Scheme 68

Scheme 69

Scheme 70

Scheme 71

Scheme 72

Scheme 73

Scheme 74

1. Remove the air distribution housing (1) from the HVAC housing and place it on a workbench. Refer to «HOUSING, HVAC, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
2. On models equipped with the 3.0L diesel engine, remove the electric Positive Temperature Coefficient (PTC) heater from the air distribution housing. Refer to «UNIT, HEATER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
3. Remove the five screws (3) that secure the mode door actuator (2) and the blend door actuator (4) to the right side of the air distribution housing and remove the actuators.
4. Remove the three screws (1) that secure the mode door actuator bracket (2) to the right side of the air distribution housing (3) and remove the bracket.
5. Remove the right side blend door drive gear (4).
6. Using Trim Stick (special tool #C-4755, Trim Stick) (4) or equivalent, disconnect the mode door drive gear lever arm (2) from the right side floor air door lever (3).
7. Remove the mode door drive gear lever (1) and lever arm from the right side the air distribution housing.
8. Remove the mode door drive gear (1) from the right side of the air distribution housing. Note the proper aligned position (3) of the drive gear to the driven gear (1) for reassembly.
9. Using Trim Stick (special tool #C-4755, Trim Stick) (3) or equivalent, remove the right side floor air door lever and gear assembly (1) and the floor air door linkage rod (2) from the right side floor air door (4).
10. Remove the console air door lever (1) and the mode door driven gear (2) from the right side the air distribution housing.
11. Using Trim Stick (special tool #C-4755, Trim Stick) (3) or equivalent, remove the two mode air door levers (1 and 2) from the right side the air distribution housing.
12. Using Trim Stick (special tool #C-4755, Trim Stick) (2) or equivalent, remove the blend door gear (1) from the right side the air distribution housing (3).
13. Remove the screw (2) that secures the mode door gear bracket (2) to the right side of the air distribution housing (1) and remove the bracket. NOTE: If the rubber seal on the air door is deformed or damaged, the air door must be replaced.
14. Remove the floor air door (1) from the right side of the air distribution housing (2) by carefully lifting the front of the air door out of the housing, then slide the air door forward to disengage the door pivot shaft from the housing.
15. Remove the evaporator temperature sensor (1) from the right side of the air distribution housing (2).
16. Remove the two screws (1) that secure the blend door actuator (2) to the left side of the air distribution housing (3) and remove the actuator.
17. Remove the blend door drive gear (1) from the left side of the air distribution housing (2).
18. Using Trim Stick (special tool #C-4755, Trim Stick) (3) or equivalent, remove the blend door gear (1) from the left side the air distribution housing (3).
19. Using Trim Stick (special tool #C-4755, Trim Stick) (3) or equivalent, remove the left side floor air door gear (4) and the floor air door linkage rod (1) from the left side floor air door (2). NOTE: If the rubber seal on the air door is deformed or damaged, the air door must be replaced.
20. Remove the floor air door (1) from the left side of the air distribution housing (2) by carefully lifting the front of the air door out of the housing, then slide the air door forward to disengage the door pivot shaft from the housing. NOTE: If the foam seal is deformed or damaged, the seal must be replaced.
21. Carefully cut the foam seal (1) along the parting lines (2).
22. Remove the thirteen screws (3) that secure the two halves of the air distribution housing (4 and 5) together.
23. Carefully remove the left half of the air distribution housing from the right half of the air distribution housing. NOTE: If the rubber seal on any air door is deformed or damaged, the air door must be replaced.
24. Remove the left side partition (1), blend air door (2) and mode air doors (3).
25. Remove the center partition (4) from the right half of the air distribution housing (5). NOTE: If the rubber seal on any air door is deformed or damaged, the air door must be replaced.
26. Remove the right side partition (1), blend air door (2) and the mode air doors (4 and 5) from the right side of the air distribution housing (3).
27. Remove the floor console air door (7) and linkage (6).
28. If required, remove the linkage from the floor console air door.

Note. The air inlet housing must be removed from HVAC housing and disassembled for service of the recirculation-air door.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 75

Scheme 76

Scheme 77

1. Remove the air inlet housing (3) from the HVAC housing and place it on a workbench. Refer to «HOUSING, HVAC, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
2. Remove the two screws (1) that secure the recirculation door actuator (2) to the air inlet housing and remove the actuator.
3. If equipped, disengage the retaining tab (5) that secure the particulate air filter cover (4) to the air inlet housing and remove the cover and particulate air filter. NOTE: If the foam seal on the air inlet housing is deformed or damaged, it must be replaced.
4. Carefully cut the foam seal (1) along the parting line (5) of the two halves of the air inlet housing (2 and 4). If the seal is deformed or damaged, it must be replaced.
5. Remove the seven screws (3) that secure the two halves of the air inlet housing together and separate the housing halves. NOTE: If the rubber seal on the recirculation-air door is deformed or damaged, the door must be replaced.
6. Carefully remove the recirculation-air door (1) from the pivot shaft (2) located on the right half of the air inlet housing (3).

Note. The HVAC housing must be removed from the vehicle and disassembled for service of the A/C evaporator.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 78

Scheme 79

Scheme 80

Scheme 81

1. Remove the HVAC housing assembly and place it on a workbench. Refer to «HOUSING, HVAC, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
2. Remove the Passive Entry Module (PEM) from the HVAC housing (2). Refer to «MODULE, PASSIVE ENTRY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) .
3. Remove the air inlet housing (1) from the HVAC housing. Refer to «HOUSING, HVAC, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
4. Remove the air distribution housing (3) from the HVAC housing. Refer to «HOUSING, HVAC, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
5. Remove the screws that secure the blower motor (2) and the blower motor power module or resistor (3), depending on application, to the HVAC housing (1).
6. Remove the blower motor and the blower motor power module or resistor from the HVAC housing.
7. Remove the two bolts (1) that secure the A/C expansion valve (3) to the evaporator tube tapping block (2).
8. Remove the A/C expansion valve from the evaporator tube tapping block and remove and discard the O-ring seals.
9. Install plugs in, or tape over the opened evaporator tube fittings.
10. Remove the fifteen screws (1) and three metal retaining clips (2) that secure the upper half of the HVAC housing (3) to the lower half of the HVAC housing (4). NOTE: Use care when separating the HVAC housing to prevent damage to the alignment pins located on the lower half of the housing.
11. Separate the two halves of the HVAC housing by lifting straight up on the upper half of the housing.
12. Remove the tapping block (1) from the evaporator tubes.
13. Lift the A/C evaporator (2) and insulator (3) out of the lower half of the HVAC housing (4).
14. If required, remove the insulator from the A/C evaporator. If the insulator is deformed or damaged, it must be replaced.

Scheme 82

Scheme 83

Scheme 84

Scheme 85

Scheme 86

Scheme 87

Scheme 88

1. If removed, install the linkage (6) onto the floor console air door (7).
2. Install the floor console air door and linkage into the right side of the air distribution housing (3).
3. Install the right side partition (1), blend air door (2) and mode air doors (4 and 5).
4. Align the air door pivot shafts and the right side partition with the holes in the center partition (4) and carefully install the center partition onto the right half of the air distribution housing (5).
5. Install the left side partition (1), blend air door (2) and mode air doors (3).
6. Align the air door pivot shafts and the left side partition with the holes in the left half of the air distribution housing (5) and carefully install the left half of the air distribution housing onto the right half of the air distribution housing (4).
7. Install the thirteen screws (3) that secure the two halves of the air distribution housing together. Tighten the screws to 2.2 N.m (20 in. lbs.).
8. Inspect the foam seal (1), especially at the parting lines (2). If the foam seal is OK, adhere the cuts made at the parting lines back together with a small amount of RTV sealer. If the foam seal is deformed or damaged, it must be replaced.
9. Install the floor air door (1) into the left side of the air distribution housing (2).
10. Install the floor air door linkage rod (2) and the left side floor air door gear (4). First, align together the largest tooth opening on the gear with largest tooth on the linkage rod (1). Then install the gear into the left side floor air door (3), with the door in the open position as shown in illustration. Make sure the gear is fully engaged to the air door.
11. Align the blend door gear (1) with the blend air door on the left side the air distribution housing (2) and install the gear. Make sure the gear is fully engaged to the air door.
12. Align the blend door drive gear (1) with the blend door gear on the left side of the air distribution housing (2) and install the drive gear. Make sure the gears are aligned as shown in illustration.
13. Position the blend door actuator (1) into the vehicle.
14. Install the blend door actuator onto the driver side of the HVAC air distribution housing (2). If necessary, rotate the actuator slightly to align the flat area of the splines on the actuator output shaft (4) with the flat area in the blend door cam (3).
15. Install the two screws (1) that secure the blend door actuator (3) to the left side of the air distribution housing (4). Tighten the screws to 2 N.m (17 in. lbs.).
16. Install the evaporator temperature sensor (1) onto the right side of the air distribution housing (2).
17. Install the floor air door (1) onto the right side of the air distribution housing (2).
18. Position the mode door gear bracket (2) onto the right side of the air distribution housing (1) and install the retaining screw (3). Tighten the screw to 2 N.m (17 in. lbs.).
19. Align the blend door gear (1) with the blend air door on the right side the air distribution housing (2) and install the gear. Make sure the gear is fully engaged to the air door. Align the two mode air door levers (1 and 2) with the mode air doors on the right side the air distribution housing (3) and install the levers. Make sure the levers are fully engaged to the air doors.
20. Align the previously installed mode air door lever to the slot in the back of mode door driven gear (2) and install the driven gear.
21. Align the console air door lever (1) to console air door linkage rod and the slot in the front of the mode door driven gear and install the lever. Make sure the lever is fully engaged to the linkage rod and the driven gear.
22. Install the floor air door linkage rod (1) and the right side floor air door gear and lever assembly (2). First, align together the largest tooth opening on the gear and lever assembly with largest tooth on the linkage rod (3). Then install the gear and lever assembly into the right side floor air door (4), with the door in the open position as shown in illustration. Make sure the gear and lever assembly is fully engaged to the air door and that both floor air doors open and close together simultaneously.
23. Align the mode door driven gear (1) to the mode door drive gear (2) in the position shown in illustration (3).
24. Align the previously installed mode air door lever to the slot in the back of mode door drive gear and install the drive gear.
25. Align the tab on the back side of the mode door drive gear lever (2) with the slot on the front of the mode door drive gear (1) and install the lever.
26. Connect the mode door drive gear lever arm (4) to the right side floor air door lever (3).
27. Rotate the mode door drive gear back and forth by hand. Make sure that the mode air doors at the top of the housing, and the floor air doors on each side of the housing, open and close fully, with no binding or excessive effort required.
28. Position the mode door actuator bracket (2) to the right side of the air distribution housing (3) and install the three retaining screws (1). Tighten the screws to 2 N.m (17 in. lbs.).
29. Align the blend door drive gear (4) with the blend door gear and install the drive gear. Make sure the gears are aligned as shown in illustration.
30. Install the blend door actuator (1) onto the right side of the air distribution housing (4). If necessary, rotate the actuator slightly to align the splines on the actuator output shaft (2) with those on the blend door drive gear (3).
31. Install the mode door actuator (3) onto the mode door actuator bracket (1). If necessary, rotate the actuator slightly to align the flat area of the splines on the actuator output shaft (4) with the flat area in the mode door drive gear (2).
32. install the five screws (3) that secure the mode door actuator (2) and the blend door actuator (4) to the right side of the air distribution housing. Tighten the screws to 2 N.m (17 in. lbs.).
33. On models equipped with the 3.0L diesel engine, install the electric Positive Temperature Coefficient (PTC) heater. Refer to «UNIT, HEATER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
34. Install the air distribution housing onto the HVAC housing. Refer to «HOUSING, HVAC, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .

Note. LHD model shown in illustrations. RHD model similar.

Scheme 89

1. Position the recirculation-air door (1) onto the pivot shaft (2) located on the right half of the air inlet housing (3). CAUTION: Make sure that the recirculation door pivot shaft is properly located in the shaft opening on the left half on the air inlet housing.
2. Install the two halves of the air inlet housing (2 and 4) together. Be sure to properly align the recirculation door pivot shaft with the opening on the left side of the air inlet housing
3. Install the seven screws (3) that secure the two halves of the air inlet housing together. Tighten the screws to 2 N.m (17 in. lbs.).
4. Install the recirculation door actuator (1) onto the air inlet housing (3). If necessary, rotate the actuator slightly to align the splines of the actuator output shaft (4) with those on the recirculation door pivot shaft (2).
5. Install the two screws (1) that secure the recirculation door actuator (2) to the air inlet housing (3). Tighten the screws to 2 N.m (17 in. lbs.).
6. If equipped, install the particulate air filter into the opening in the air inlet housing with the arrow on the filter pointing down and install the cover (4). Make sure the retaining tab (5) is fully engaged. Refer to «FILTER, PARTICULATE AIR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
7. Install the air inlet housing onto the HVAC housing. Refer to «HOUSING, HVAC, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .

Note. If the A/C evaporator is being replaced, add 60 milliliters (2 fluid ounces) of refrigerant oil to the refrigerant system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.

Note. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to OIL, REFRIGERANT, STANDARD PROCEDURE .

Note. Replacement of the refrigerant line seals is required anytime a refrigerant line is disconnected. Failure to replace the rubber and metal seals could result in a refrigerant system leak.

Note. LHD model shown in illustrations. RHD model similar.

1. If removed, install the insulator (3) over the A/C evaporator (2). If the insulator is deformed or damaged, it must be replaced.
2. Install the A/C evaporator into the lower half of the HVAC housing (4). Make sure that the evaporator drain within the HVAC housing is clean and unrestricted and that the insulator and evaporator are properly positioned in the housing.
3. Install the tapping block (1) onto the evaporator tubes.
4. Install the upper half of the HVAC housing (3) onto the lower half of the HVAC housing (4).
5. Install the fifteen screws (1) that secure the two halves of the HVAC housing together. Tighten the screws to 2.2 N.m (20 in lbs.).
6. Install the three metal retaining clips (2) that secure the two halves of the HVAC housing together.
7. Remove the tape or plugs from the evaporator tube fittings.
8. Lubricate new rubber O-ring seals with clean refrigerant oil and install them on the evaporator tube fittings. Use only the specified O-rings as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
9. Install the A/C expansion valve (3) onto the evaporator tube tapping block (2).
10. Install the two bolts (1) that secure the A/C expansion valve to the evaporator tube tapping block. Tighten the bolts to 11 N.m (97 in. lbs.).
11. Install the blower motor (2) onto the HVAC housing (1). Tighten the screws to 2.2 N.m (20 in. lbs.).
12. Install the blower motor resistor or power module (3), depending on application. Tighten the screws to 2 N.m (17 in. lbs.).
13. Install the air inlet housing (1) onto the HVAC housing (2). Refer to «HOUSING, HVAC, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
14. Install the air distribution housing (3) onto the HVAC housing. Refer to «HOUSING, HVAC, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
15. Install the Passive Entry Module (PEM) onto the HVAC housing. Refer to «MODULE, PASSIVE ENTRY, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) .
16. Install the HVAC housing assembly. Refer to «HOUSING, HVAC, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
17. If the A/C evaporator is being replaced, add 60 milliliters (2 fluid ounces) of refrigerant oil to the refrigerant system. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.

Note. The air distribution housing must be removed from the HVAC housing and disassembled for service of the mode-air and blend-air doors.

Note. LHD model shown in illustrations. RHD model similar.

1. Position the air distribution housing (2) to the rear of the HVAC housing (3)
2. Engage the two tab-and-slot type retainers (1).
3. Tip the air distribution housing upward until it is properly aligned with the HVAC housing.
4. Carefully engage the two retaining tabs (1) that secure the air distribution housing (2) to the HVAC housing (3).
5. Install the two screws (4) that secure the air distribution housing to the HVAC housing. Tighten the screws to 2.2 N.m (20 in. lbs.).
6. Carefully install the heater core (2) into the air distribution housing (3).
7. Reposition the heater core retaining bracket (4) and install the screw (5). Tighten the screw to 2.2 N.m (20 in. lbs.).
8. Reposition the lower part of the flange (1).
9. Install the two screws (4) that secure the lower part of the flange (3) to the upper part of the HVAC housing (2). Tighten the screws to 2.2 N.m (20 in. lbs.).
10. Install the foam seal (1) onto the front of the HVAC housing.
11. Reposition and connect the wire harness to the mode door actuator, both blend door actuators and the evaporator temperature sensor. Refer to «ACTUATOR, MODE DOOR»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) and «ACTUATOR, BLEND DOOR»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) and «SENSOR, EVAPORATOR TEMPERATURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
12. Install the floor distribution ducts onto the air distribution housing. Refer to «DUCT, FLOOR DISTRIBUTION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
13. Install the HVAC housing assembly. Refer to «HOUSING, HVAC, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .

Note. The air inlet housing must be removed from HVAC housing and disassembled for service of the recirculation-air door.

Note. LHD model shown in illustration. RHD model similar.

1. Position the air inlet housing (2) to the top of the HVAC housing (3) and engage the two tab-and-slot type retainers (4) located on the right side of the housings.
2. Tip the left side of the air inlet housing downward until it is properly seated on the HVAC housing.
3. Install the screw (1) that secures the air inlet housing to the HVAC housing. Tighten the screw to 2.2 N.m (20 in. lbs.).
4. Install the two screws (4) that secure the left side of the air inlet housing (2) to the HVAC housing (3). Tighten the screw to 2.2 N.m (20 in. lbs.).
5. Connect the wire harness connector to the recirculation door actuator (1).
6. Install the HVAC housing assembly. Refer to «HOUSING, HVAC, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .

Note. If the A/C evaporator is being replaced, add 60 milliliters (2 fluid ounces) of refrigerant oil to the refrigerant system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.

Note. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to OIL, REFRIGERANT, STANDARD PROCEDURE .

Note. Replacement of the refrigerant line seals is required anytime a refrigerant line is disconnected. Failure to replace the rubber and metal seals could result in a refrigerant system leak.

Note. LHD model shown in illustrations. RHD model similar.

1. Position the HVAC housing assembly into the passenger compartment side of the dash panel (2). Make sure that the condensate drain tube protrudes through the opening in the floor panel.
2. Install the two nuts (1) that secure the HVAC housing assembly to the engine compartment side of the dash panel. Tighten the nuts to 4.5 N.m (40 in. lbs.).
3. Connect the heater hoses to the heater core tubes.
4. Connect the A/C suction line and A/C liquid line to the A/C expansion valve. Refer to «VALVE, A/C EXPANSION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
5. Install the HVAC air inlet duct (1) to the engine compartment side of the dash panel (3).
6. Install the two nuts (2) that secure the HVAC air inlet duct to the dash panel. Tighten the nuts to 4.5 N.m (40 in. lbs.).
7. Install the cowl extension silencer. Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
8. Install the windshield wiper module and arms. Refer to «LINKAGE, WIPER ARM, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/wiperwasher-systems/#wiper-system-washer-system-service-information) .
9. Install the instrument panel. Refer to «PANEL, INSTRUMENT, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
10. Connect the wiring harness connector (2) to the left side blend door actuator (3). NOTE: Illustration shown with instrument panel removed from view for clarity.
11. Connect the driver side floor ducts to the HVAC housing (2).
12. Install the push pin (3) that secures the driver side floor ducts to the instrument panel.
13. Install the driver side instrument panel silencer.
14. Install the four nuts (1) that secure the HVAC housing to the center of the instrument panel support. Tighten the nuts to 4.5 N.m (40 in. lbs.).
15. Install the bin into the center of the instrument panel.
16. Install the radio. Refer to «RADIO, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/entertainment-systems/#audio-and-video-service-information) .
17. Install the floor console. Refer to «CONSOLE, FLOOR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
18. Connect the wiring harness connector (2) to the evaporator temperature sensor (1).
19. Connect the wiring harness connector (2) to the right side blend door actuator (3).
20. Connect the wiring harness connector (1) to the mode door actuator (3).
21. Connect the wiring harness connector (2) to the recirculation door actuator (3).
22. Connect the wire harness connector to the Passive Entry Module (PEM). Refer to «MODULE, PASSIVE ENTRY, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) .
23. Connect the wiring harness connector (1) to the blower motor (2).
24. Connect the two wiring harness connectors (1) to the blower motor power module (2). NOTE: Illustration shown with instrument panel removed from view for clarity.
25. Connect the passenger side floor ducts (1) to the HVAC housing (2).
26. Install the nut (1) that secures the passenger side end of the HVAC housing (3) to the instrument panel support (2). Tighten the nut to 4.5 N.m (40 in. lbs.).
27. Install the IP trim panel, glove box shelf and the glove box. Refer to «GLOVE BOX, INSTRUMENT PANEL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
28. Install the passenger side instrument panel silencer.
29. Reconnect the negative battery cable.
30. If the heater core is being replaced, flush the cooling system. Refer to «REVERSE FLUSHING»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__reverse-flushing) .
31. Refill the engine cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
32. Evacuate the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
33. If the A/C evaporator is being replaced, add 60 milliliters (2 fluid ounces) of refrigerant oil to the refrigerant system. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
34. Charge the refrigerant system. Refer to «REFRIGERANT SYSTEM CHARGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__refrigerant-system-charge) .
35. Initiate the Actuator Calibration function using a scan tool. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-hvac-system/#heating-air-conditioning-electrical-diagnostics) .

Scheme 90

The blower motor (1) is used to control the velocity of air moving through the HVAC housing assembly by spinning the blower wheel (2) at the selected or programmed speed (depending on control system application).

The blower motor is a 12-volt, Direct Current (DC) motor that is mounted within a plastic housing that has integral wire harness connector (3), integral mounting tabs (4) and a squirrel cage-type blower wheel that is secured to the blower motor shaft. The blower wheel is positioned within the air inlet housing on the passenger side of the HVAC housing assembly.

The blower motor controls the velocity of air moving through the HVAC housing by spinning the blower wheel within the HVAC air inlet housing at the selected speed.

Both the Manual Temperature Control (MTC) heating-A/C system and the Automatic Temperature Control (ATC) heating-A/C system have an electronic blower motor power module to control blower motor speed. The power module uses a Pulse Width Modulated (PWM) input from the A/C-heater control and a feedback signal from the blower motor to regulate the blower motor ground path. On both systems, the blower motor receives battery current through the Totally Integrated Power Module (TIPM) whenever the ignition switch is in the Run position, and the blower motor control is in any position except Off.

The blower motor control system is diagnosed using a scan tool. Refer to STANDARD PROCEDURE .

The blower motor and blower motor wheel are factory balanced as an assembly and cannot be adjusted or repaired and must be replaced if inoperative or damaged.

BLOWER MOTOR

Note. Refer to appropriate Wiring Information for circuit descriptions and diagrams.

Possible causes of an inoperative blower motor include

1. Open fuse
2. Inoperative blower motor power module
3. Inoperative blower motor switch
4. Inoperative mode control switch
5. Inoperative blower motor
6. Inoperative blower motor circuit wiring or wire harness connectors

NOISE

To determine if the blower motor is the source of the noise, simply switch the blower motor from Off to On. To verify that the blower motor is the source of the noise, unplug the blower motor wire harness connector and operate the heater-A/C system. If the noise goes away, possible causes include

1. Foreign material on fresh air inlet screen
2. Foreign material in blower wheel
3. Foreign material in the HVAC housing
4. Improper blower motor mounting
5. Deformed or damaged blower wheel
6. Worn blower motor bearings or brushes

VIBRATION

Possible causes of blower motor vibration include

1. Improper blower motor mounting
2. Foreign material in blower wheel
3. Deformed or damaged blower wheel
4. Worn blower motor bearings

Note. LHD model shown in illustration. RHD model similar.

1. Disconnect and isolate the negative battery cable.
2. Remove the passenger side instrument panel silencer.
3. Disconnect the wire harness connector (1) from the blower motor (2).
4. Remove the three screws (3) that secure the blower motor to the HVAC housing (4) and remove the blower motor.

Note. LHD model shown in illustration. RHD model similar.

1. Position the blower motor (2) into the HVAC housing (4).
2. Install the three screws (3) that secure the blower motor to the HVAC housing. Tighten the screws to 2.2 N.m (20 in. lbs.).
3. Connect the wire harness connector (1) to the blower motor.
4. Install the passenger side instrument panel silencer.
5. Reconnect the negative battery cable.

Note. LHD model shown in illustrations. RHD model similar.

OUTBOARD OUTLETS

Note. The outboard air outlets can be serviced without removing the instrument panel cover.

Scheme 91

Note. Underside of instrument panel cover shown in illustration. Instrument panel duct removed from view for clarity.

1. Disconnect and isolate the negative battery cable.
2. When servicing the passenger side air outlet: remove the passenger side instrument panel silencer remove the glove box, glove box shelf and the trim panel, located behind the glove box. Refer to «GLOVE BOX, INSTRUMENT PANEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
3. When servicing the driver side air outlet: remove the driver side instrument panel silencer remove the knee blocker. Refer to «PANEL, INSTRUMENT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) . NOTE: The air outlet trim panels are serviced with the air outlets as an assembly.
4. Using Trim Stick (special tool #C-4755, Trim Stick) or equivalent, disengage the retaining tabs (2) that secure the outboard air outlet trim panel to the face of the instrument panel cover (4).
5. Reach up behind the instrument panel and disengage the four retaining tabs (1 and 3) that secure each outboard air outlet (5) to the back of the instrument panel cover. NOTE: If the foam seal on an air outlet is deformed or damaged, the seal must be replaced.
6. Remove the outboard air outlet(s) from the instrument panel cover.

INBOARD OUTLETS

Note. Take the proper precautions to protect the front face of the center bezel from cosmetic damage while performing this procedure.

Scheme 92

1. Disconnect and isolate the negative battery cable.
2. Remove the instrument panel center bezel (3) and place it on a workbench. Refer to «BEZEL, INSTRUMENT PANEL, CENTER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
3. Remove the two screws (1) that secure each air outlet (2) to the center bezel.
4. Using Trim Stick (special tool #C-4755, Trim Stick) or equivalent, gently disengage the two retaining tabs (4) that secure each air outlet to the center bezel. NOTE: If the foam seal on an air outlet is deformed or damaged, the seal must be replaced.
5. Remove the inboard air outlet(s) from the center bezel.

FLOOR CONSOLE OUTLETS

Note. Take the proper precautions to protect the floor console rear trim panel from cosmetic damage while performing this procedure.

1. Disconnect and isolate the negative battery cable.
2. Remove the floor console rear trim panel (4) from the back of the floor console using Trim Stick (special tool #C-4755, Trim Stick) or equivalent. Disconnect any necessary electrical connectors and place the trim panel on a workbench.
3. Remove the six screws (1 and 3) that secure floor console rear duct (2) to the floor console rear trim panel (4). NOTE: If the foam seal on the console rear duct is deformed or damaged, the seal must be replaced.
4. Remove the floor console rear duct from the floor console rear trim panel.
5. Using Trim Stick (special tool #C-4755, Trim Stick) (1) or equivalent, gently pry on the air outlet barrel(s) (3) until the barrel retainers release from the pivot shafts on the console rear duct (2). Rotate the air outlet barrel(s) as necessary.

Note. LHD model shown in illustrations. RHD model similar.

Note. Underside of instrument panel cover shown in illustration. Instrument panel duct removed from view for clarity.

Note. Make sure that the air outlet is properly aligned to the instrument panel opening and that the foam seal on the outlet is properly installed.

1. Install the outboard instrument panel air outlet (5) through the opening in the instrument panel cover (4) and connect it to the duct
2. Engage the four retaining tabs (1 and 3) that secure each outboard air outlet to the instrument panel cover. Make sure the retaining tabs are fully engaged.
3. Engage the retaining tabs (2) that secure the outboard air outlet trim panel to the face of the instrument panel cover. Make sure the retaining tabs are fully engaged.
4. When servicing the passenger side air outlet: Install the IP trim panel, glove box shelf and glove box Refer to «GLOVE BOX, INSTRUMENT PANEL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) . install the passenger side instrument panel silencer
5. When servicing the driver side air outlet: install the knee blocker Refer to «PANEL, INSTRUMENT, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) . install the driver side instrument panel silencer
6. Reconnect the negative battery cable.

Note. Take the proper precautions to protect the front face of the center bezel from cosmetic damage while performing this procedure.

Note. If the foam seal on an air outlet is deformed or damaged, the seal must be replaced.

1. Position the inboard air outlet(s) (2) to the center bezel (3).
2. Engage the two retaining tabs (4) that secure each air outlet to the center bezel. Make sure the retaining tabs are fully engaged.
3. Install the two screws (1) that secure each air outlet to the center bezel. Tighten the screws securely.
4. Install the instrument panel center bezel. Refer to «BEZEL, INSTRUMENT PANEL, CENTER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
5. Reconnect the negative battery cable.

Note. Take the proper precautions to protect the floor console rear trim panel from cosmetic damage while performing this procedure.

1. Position the air outlet barrel(s) (1) into the console rear duct (2) and gently push the barrel(s) into the duct, until the barrel snaps into position on the pivot shafts. Make sure each barrel is square in the duct opening and moves freely on the pivot shafts. NOTE: If the foam seal on the console rear duct is deformed or damaged, the seal must be replaced.
2. Install the floor console rear duct (2) onto the floor console rear trim panel (4).
3. Install the six screws (1 and 3) that secure floor console rear duct to the floor console rear trim panel. Tighten the screws securely.
4. Install the floor console rear trim panel (4) onto the back of the floor console. Be sure to connect any necessary electrical connectors and properly align the console ducts.
5. Reconnect the negative battery cable.

WARNING

CAUTION

DIAGNOSIS AND TESTING - REFRIGERANT SYSTEM LEAKS

Note. If the A/C system refrigerant charge is empty or low, a leak in the A/C system is likely. When searching for a refrigerant leak in the A/C system, use an electronic leak detector and refrigerant leak detection dye with an Ultra Violet (UV) light that is designed for R-134a refrigerant. It is important to use only high-quality refrigerant leak detection equipment to properly locate refrigerant system leaks, such as the equipment listed in the teamPSE Service Equipment Catalog. Use only Chrysler approved R-134a leak detection dye, available through Mopar®.

1. Visually inspect all A/C lines, A/C fittings and A/C components under the hood for an oily residue. Oil residue can be an indicator of a leak location.
2. Connect a high-quality manifold gauge set or refrigerant recovery machine to the A/C system and determine if the static A/C system pressure is above or below 345 kPa (50 psi). Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . If static A/C system pressure is less than 345 kPa (50 psi), refer to «SYSTEM EMPTY»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__system-empty) . If static A/C system pressure is greater than 345 kPa (50 psi), refer to «SYSTEM LOW»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__system-low) .

SYSTEM EMPTY

1. Evacuate the refrigerant system to the lowest degree of vacuum possible (approximately -8 kPa (-26 in. Hg) or greater vacuum) for at least 30 minutes. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . CAUTION: Use only Chrysler LLC approved R-134a leak detection dye. It is important to use only high-quality refrigerant leak detection equipment. Small leaks may not be found using low-budget equipment. Failure to follow these instructions may result in an incomplete diagnosis and possible remaining refrigerant leaks.
2. Prepare an R-134a dye injector with a Chrysler approved R-134a leak detection dye.
3. Prepare the vehicle specific amount of R-134a refrigerant. Refer to «REFRIGERANT, SPECIFICATIONS»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . NOTE: Anytime an R-134a leak detection dye has been added to the refrigerant system, a label indicating that dye has been added should be placed on the vehicle in plain view, for other technicians.
4. Dispense the leak detection dye and the correct amount of R-134a refrigerant into the evacuated refrigerant system. Refer to «REFRIGERANT SYSTEM CHARGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__refrigerant-system-charge) .
5. Refer to «LEAK TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__leak-test) .

SYSTEM LOW

1. Prepare an R-134a dye injector with a Chrysler approved R-134a leak detection dye. NOTE: Anytime an R-134a leak detection dye has been added to the refrigerant system, a label indicating that dye has been added should be placed on the vehicle in plain view, for other technicians.
2. Dispense the leak detection dye and 0.284 kilograms (10 ounces) of R-134a refrigerant into the evacuated refrigerant system. Refer to «REFRIGERANT SYSTEM CHARGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__refrigerant-system-charge) .
3. Refer to «LEAK TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__leak-test) .

LEAK TEST

1. Position the vehicle in a wind-free work area. This will aid in detecting small leaks.
2. Operate the heating and A/C system with the engine at idle under the following conditions for at least 15 minutes. Doors or windows open Transmission in Park or Neutral with the parking brake set (depending on transmission application) Front A/C and heater controls set to outside air, full cool, panel mode, high blower and A/C compressor engaged If equipped, rear A/C and heater controls set to full cool and high blower.
3. Shut the vehicle off and wait at least 5 minutes. CAUTION: Use it is important to use only a high-quality Ultra Violet (UV) light when searching for a leak in the refrigerant system. Small leaks may not be found using budget equipment. Failure to follow these instructions may result in an incomplete diagnosis and possible remaining refrigerant leaks.
4. Begin searching for leaks using a high quality UV light to detect the fluorescent R-134a leak detection dye. Inspect all connections, plumbing fittings, brazed joints, hoses, hose crimps, service ports, compressor housing, pressure relief valve and A/C condenser for dye. Inspect the evaporator drain tube and condensate for presence of dye, which indicates a leak from the A/C evaporator. WARNING: Use extreme care when working around a running engine. Keep hands and fingers clear of the radiator fan, accessory drive belt and all other moving components. Keep away when wearing loose clothing, jewelry or long hair that is not properly secured. Underhood components may become hot to the touch. Be careful not to come into contact with hot engine, A/C and engine cooling system components. Failure to follow these instructions may result in serious or fatal injury. CAUTION: Use only an electronic leak detector designed for R-134a refrigerant. It is important to use only high-quality refrigerant leak detection equipment. Small leaks may not be found using budget equipment. Failure to follow these instructions may result in an incomplete diagnosis and possible remaining refrigerant leaks.
5. If a leak is not found with the R-134a detection dye, use a high-quality electronic R-134a leak detector and insert it into the evaporator drain tube, and into the instrument panel air outlets, to check for evaporator leaks. Check the evaporator tubes at the A/C expansion valve, for leaks not visible behind the valve. Check around the front of the A/C compressor, for compressor shaft seal leaks. Check between the A/C condenser and radiator for condenser leaks not previously visible.

REFRIGERANT SYSTEM RECOVERY

Scheme 93

When servicing the A/C system, an R-134a refrigerant recovery/recycling/charging station (1) that meets SAE standard J2788 must be used. Per SAE standard J2788, refrigerant recovery stations must recover 95% of the refrigerant system within 30 minutes at 21.1° C (70° F) and be able to measure the amount of refrigerant removed from the system to an accuracy of 28 grams (1 oz.). Refer to the operating instructions supplied by the equipment manufacturer for proper care and use of this equipment.

Note. A/C system should be tested prior to refrigerant recovery if the use of A/C system sealants are suspected. These sealants have the potential to clog refrigerant recovery equipment and cause vehicle A/C component damage. Various tool manufacturers make tool kits that detect A/C system sealants. Refer to the operating instructions supplied by the equipment manufacturer for proper care and use of this equipment.

If sealants are detected in an A/C system, the system should be treated as contaminated and replacement of the entire A/C refrigerant system is recommended. A/C systems found to be contaminated with A/C system sealers, A/C stop-leak products or seal conditioners void the warranty for the A/C system.

REFRIGERANT SYSTEM EVACUATE

Note. Special effort must be used to prevent moisture from entering the A/C system oil. Moisture in the oil is very difficult to remove and will cause a reliability problem with the A/C compressor.

If an A/C compressor designed to use R-134a refrigerant is left open to the atmosphere for an extended period of time, it is recommended that the refrigerant oil be drained and replaced with new oil, or a new A/C compressor be used. This will eliminate the possibility of contaminating the refrigerant system.

If the refrigerant system has been open to the atmosphere, it must be evacuated before the system can be filled. Moisture and air mixed with the refrigerant will raise the compressor head pressure above acceptable operating levels. This will reduce the performance of the A/C system and damage the A/C compressor. Moisture will boil at near room temperature when exposed to vacuum. Use the following procedure to evacuate the refrigerant system

Note. When connecting the service equipment coupling to the line fitting, verify that the valve of the coupling is fully closed. This will reduce the amount of effort required to make the connection.

1. Recover the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
2. Connect a suitable charging station, refrigerant recovery machine or a manifold gauge set with vacuum pump and refrigerant recovery equipment. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
3. Open the suction and discharge valves and start the vacuum pump. The vacuum pump should run a minimum of 45 minutes prior to charge to eliminate all moisture in system. When the suction gauge reads to the lowest degree of vacuum possible (approximately -88 kPa (- 26 in. Hg) or greater) for 30 minutes, close all valves and turn off vacuum pump. If the system fails to reach specified vacuum, the refrigerant system likely has a leak that must be corrected. If the refrigerant system maintains specified vacuum for at least 30 minutes, start the vacuum pump, open the suction and discharge valves. Then allow the system to evacuate an additional 10 minutes.
4. Close all valves. Turn off and disconnect the vacuum pump.
5. Charge the refrigerant system. Refer to «REFRIGERANT SYSTEM CHARGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__refrigerant-system-charge) .

REFRIGERANT SYSTEM CHARGE

Note. The Underhood HVAC Specification Label contains the refrigerant fill specification of the vehicle being serviced.

After all refrigerant system leaks have been repaired and the refrigerant system has been evacuated, a refrigerant charge can be injected into the system. Refer to REFRIGERANT SYSTEM CHARGE .

When charging the A/C system, use an R-134a refrigerant recovery/recycling/charging station (1) that meets SAE standard J2788. Per SAE standard J2788, refrigerant recovery stations must charge the system to an accuracy of 14 grams (0.5 oz.). Refer to the operating instructions supplied by the equipment manufacturer for proper care and use of this equipment.

CHARGING PROCEDURE

1. Evacuate the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
2. Connect an R-134a refrigerant recovery/recycling/charging station that meets SAE standard J2788 to the refrigerant system.
3. Measure the proper amount of refrigerant and heat it to 52° C (125° F) with the charging station. Refer to «REFRIGERANT»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . Refer to the operating instructions supplied by the equipment manufacturer for proper use of this equipment.
4. Open both the suction and discharge valves, then open the charge valve to allow the heated refrigerant to flow into the system.
5. When the transfer of refrigerant has stopped, close both the suction and discharge valves.
6. If all of the refrigerant charge did not transfer from the dispensing device, open all of the windows in the vehicle and set the heating-A/C system controls so that the A/C compressor is engaged and the blower motor is operating at its lowest speed setting. Run the engine at a steady high idle (about 1400 rpm). If the A/C compressor does not engage, test the compressor clutch circuits and repair as required. WARNING: Take care not to open the discharge (high pressure) valve at this time. Failure to follow these instructions may result in possible serious or fatal injury.
7. Open the low-side valve to allow the remaining refrigerant to transfer to the refrigerant system.
8. Disconnect the charging station from the refrigerant system service ports.
9. Reinstall the caps onto the refrigerant system service ports.

Scheme 94

Note. Denso A/C clutch assembly shown in illustration. Visteon A/C clutch assembly similar.

The A/C compressor clutch assembly consists of a stationary electromagnetic field coil (4), bearing and pulley assembly (3), shims (7) and a clutch plate (2) that is splined to the compressor shaft and secured by a bolt (1). These components provide the means to engage and disengage the A/C compressor from the engine accessory drive belt.

The A/C clutch bearing and pulley assembly on both A/C compressors are retained to the front of the compressor with a snap ring (6). The A/C clutch coil on the Denso A/C compressor is also retained to the front of the compressor using a snap ring (5). The A/C clutch coil on the Visteon A/C compressor is pressed onto the front of the compressor.

Scheme 95

Note. Typical A/C compressor shown in illustration.

Models equipped with the 3.0L and 5.7L engine, use a Denso 10SRE18 A/C compressor, with a fixed displacement of 180 cubic centimeters (11 cubic inches).

Models equipped with the 3.6L engine, use a Visteon RS-18 A/C compressor, with a fixed displacement of 180 cubic centimeters (11 cubic inches).

All A/C compressors have the suction and discharge ports (2) located on the compressor cylinder head (3) at the rear of the compressor and have a label identifying the use of R-134a refrigerant.

HIGH PRESSURE RELIEF VALVE

A high pressure relief valve is located on the compressor cylinder head at the rear of the A/C compressor. Refer to HIGH PRESSURE RELIEF VALVE . This mechanical valve is designed to vent refrigerant from the A/C system to protect against damage to the A/C compressor and other A/C system components caused by condenser air flow restriction or an overcharge of refrigerant.

A/C CLUTCH

The A/C compressor clutch components provide the means to engage and disengage the A/C compressor from the engine accessory drive belt. When the electromagnetic A/C clutch field coil is energized, it magnetically draws the clutch plate into contact with the clutch pulley and drives the compressor shaft. When the coil is not energized, the pulley freewheels on the clutch hub bearing, which is part of the pulley assembly.

A/C compressor clutch engagement is controlled by the Powertrain Control Module (PCM) or the Engine Control Module (ECM), depending on engine application.

The A/C compressor clutch components cannot be repaired and must be replaced if inoperative or damaged.

A/C COMPRESSOR

The A/C compressor is driven by the engine through an electric clutch, drive pulley and belt arrangement. The A/C compressor is lubricated by refrigerant oil that is circulated throughout the refrigerant system with the refrigerant.

The A/C compressor draws in low-pressure refrigerant vapor from the A/C evaporator through its suction port. It then compresses the refrigerant into a high-pressure, high-temperature refrigerant vapor, which is then pumped to the A/C condenser through the compressor discharge port.

The A/C compressor cannot be repaired and must be replaced if found to be inoperative or damaged. The compressor clutch, pulley and bearing assembly, and clutch field coil are available for service. If an internal failure of the A/C compressor has occurred, the A/C condenser must also be replaced. Refer to CONDENSER, A/C, REMOVAL .

The high pressure relief valve vents refrigerant from the A/C system when a discharge pressure of 3445 to 4135 kPa (500 to 600 psi) or above is reached. The high pressure relief valve closes with a minimum discharge pressure of 2756 kPa (400 psi) is reached.

The high pressure relief valve should not open when the A/C system is operating correctly. If the high pressure relief valve vents refrigerant, there is most likely a problem within the A/C refrigerant system. The high pressure relief valve vents only enough refrigerant to reduce the A/C system pressure, and then re-seats itself. If the high pressure relief valve vents refrigerant, see the A/C System Diagnosis chart. Refer to DIAGNOSIS AND TESTING .

The high pressure relief valve is factory-calibrated and cannot be adjusted or repaired, and must not be removed or otherwise disturbed. The valve is only serviced as a part of the A/C compressor.

A/C CLUTCH COIL

The A/C clutch coil electrical circuit is controlled by the Powertrain Control Module (PCM), through the Totally Integrated Power Module (TIPM). Refer to appropriate Wiring Information for complete HVAC wiring diagrams. Begin testing of a suspected A/C clutch coil problem by performing the preliminary checks.

PRELIMINARY CHECKS

1. Using a scan tool, check for Diagnostic Trouble Codes (DTCs) in the A/C heater control, PCM and TIPM. If no DTCs are found, refer to 2 . If any DTCs are found, repair as required.
2. If the A/C clutch still will not engage, verify the refrigerant charge level by conducting the A/C Performance test. Refer to «DIAGNOSIS AND TESTING»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . If the refrigerant charge level is OK, refer to «COIL RESISTANCE TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__coil-resistance-test) and «COIL CURRENT DRAW TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__coil-current-draw-test) . If the refrigerant charge level is not OK, adjust the refrigerant charge as required.

COIL RESISTANCE TEST

1. Disconnect and isolate the negative battery cable.
2. Disconnect the wire harness connector from the A/C clutch coil connector.
3. Use an ohm meter and Back Probe Tool (special tool #6801, Terminal Probe) and measure the resistance of the A/C clutch coil at the coil connector terminals.
4. See A/C Clutch Coil Specifications table for acceptable A/C clutch coil resistance. Specifications apply for a work area temperature of 21° C (70° F). If the A/C clutch coil reading is below specifications, the coil is shorted and must be replaced. If the A/C clutch coil reading is above specifications, the coil is open and must be replaced.

COIL CURRENT DRAW TEST

1. Verify the battery state of charge. Refer to «BATTERY, AGM, DIAGNOSIS AND TESTING»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#battery-system-service-information) .
2. Connect an ammeter (0 to 10 ampere scale selected) in series with the A/C clutch coil feed terminal using Back Probe Tool (special tool #6801, Terminal Probe). Connect a voltmeter (0 to 20 volt scale selected) to measure voltage across the battery and the A/C clutch coil.
3. With the A/C-heater control in the A/C mode and the blower motor at low speed, start the engine and allow it to run at a normal idle speed.
4. The A/C clutch should engage immediately and the clutch coil supply voltage should be within two volts of the battery voltage. If the clutch coil supply voltage is OK, refer to 5 . If the coil supply voltage is not within two volts of battery voltage, test the clutch coil feed circuit for excessive voltage drop and repair as necessary.
5. See A/C Clutch Coil Specifications table for acceptable A/C clutch coil current draw. Specifications apply for a work area temperature of 21° C (70° F). If voltage is more than 12.5 volts, add electrical loads by turning on electrical accessories until voltage reads below 12.5 volts. If the A/C clutch coil current reading is zero, the coil is open and must be replaced. If the A/C clutch coil current reading is above specifications, the coil is shorted and must be replaced.

A/C CLUTCH COIL SPECIFICATIONS

A/C SYSTEM NOISE

When investigating an A/C system related noise, you must first know the conditions under which the noise occurs. These conditions include: weather, vehicle speed, transmission in gear or neutral, engine speed, engine temperature, and any other special conditions. Noises that develop during A/C operation can often be misleading. For example: What sounds like a failed front engine bearing or connecting rod, may be caused by loose bolts, nuts, mounting brackets or a loose compressor clutch assembly.

Drive belts are speed sensitive. At different engine speeds and depending upon drive belt tension, drive belts can develop noises that are mistaken for an A/C compressor noise. Improper drive belt tension can cause a misleading noise when the compressor clutch is engaged, which may not occur when the compressor clutch is disengaged. Check the accessory drive belt condition and tension as described in Cooling before beginning this procedure.

1. Select a quiet area for testing. Duplicate the complaint conditions as much as possible. Turn the A/C compressor On and Off several times to clearly identify the compressor noise. Listen to the A/C compressor while the clutch is engaged and disengaged. Probe the A/C compressor with an engine stethoscope or a long screwdriver with the handle held to your ear to better localize the source of the noise.
2. Loosen all of the compressor mounting hardware and retighten. Check the compressor clutch retainer. Be certain that the clutch field coil is mounted securely to the A/C compressor, and that the clutch plate and pulley are properly aligned and have the correct air gap.
3. To duplicate high-ambient temperature conditions (high head pressure), restrict the air flow through the A/C condenser. Install a manifold gauge set or a scan tool to be certain that the discharge pressure does not exceed 2760 kPa (400 psi).
4. Check the refrigerant system plumbing for incorrect routing, rubbing or interference, which can cause unusual noises. Also check the refrigerant lines and hoses for kinks or sharp bends that will restrict refrigerant flow, which can cause noises.
5. If the noise is from opening and closing of the high pressure relief valve, conduct the A/C Performance test and verify refrigerant charge level. Refer to «DIAGNOSIS AND TESTING»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
6. If the high pressure relief valve still does not seat properly, replace the A/C compressor. Refer to «COMPRESSOR, A/C, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .

STANDARD PROCEDURE - A/C CLUTCH INSPECTION

Note. The A/C clutch can be serviced in the vehicle. The refrigerant system can remain fully-charged during compressor clutch, pulley and bearing assembly, or coil replacement.

Scheme 96

Examine the friction surfaces of the pulley and the clutch plate (2) for wear. The pulley and clutch plate should be replaced if there is excessive wear or scoring.

If the friction surfaces are oily, inspect the shaft and nose area of the A/C compressor (1) for refrigerant oil. If refrigerant oil is found, the compressor shaft seal is leaking and the A/C compressor must be replaced.

Check the pulley bearing for roughness or excessive leakage of grease. Replace the pulley and bearing assembly, if required.

Note. The A/C clutch can be serviced with the refrigerant system fully-charged.

Note. Typical A/C compressor and clutch assembly shown in illustrations.

Scheme 97

Scheme 98

Scheme 99

1. Disconnect and isolate the negative battery cable.
2. Remove the accessory drive belt. Refer to «BELT, SERPENTINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__removal) .
3. Disconnect the engine wire harness from the A/C clutch coil connector (1).
4. If required (depending on A/C compressor application), remove the A/C clutch coil connector and lead from the connector bracket (2).
5. If required, remove the A/C compressor from the engine and support the compressor. Refer to «COMPRESSOR, A/C, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
6. Remove the compressor shaft bolt (3). A band-type oil filter wrench or a strap wrench may be used to hold the clutch plate (4) from rotating during bolt removal. CAUTION: Do not pry between the clutch plate and the pulley and bearing assembly to remove the clutch plate from the compressor shaft as this may damage the clutch plate. NOTE: Use care not to lose any clutch shim(s) during removal of the clutch plate, as they may be reused during the clutch plate installation process.
7. Tap the clutch plate (2) lightly with a plastic mallet to release it from the splines on the compressor shaft (1) and remove the clutch plate and shim(s) (3).
8. Using A/C Snap Ring Pliers (special tool #9764, Pliers, A/C Snap Ring) (1) or equivalent, remove the snap ring (2) that secures the pulley and bearing assembly (3) to the A/C compressor and remove the pulley and bearing assembly.
9. Using A/C Snap Ring Pliers (special tool #9764, Pliers, A/C Snap Ring) (1) or equivalent, remove the snap ring (4) that secures the A/C clutch coil (2) to the A/C compressor (3) and remove the coil.

3.0L ENGINE

Note. The A/C condenser must be replaced if an internal failure of the A/C compressor has occurred. Refer to CONDENSER, A/C, REMOVAL .

Note. The A/C compressor may be removed and repositioned without disconnecting the refrigerant lines or discharging the refrigerant system. Discharging is not necessary if servicing the A/C clutch, clutch coil or engine.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 100

Scheme 101

1. Disconnect and isolate the negative battery cable.
2. Remove the engine trim cover.
3. Recover the refrigerant from the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
4. Disconnect the mass air flow sensor wire harness connector and remove the engine air cleaner housing. Refer to «BODY, AIR CLEANER, REMOVAL»(ref-466389-S28200693672012042500000) .
5. Remove the accessory drive belt. Refer to «BELT, SERPENTINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__removal) .
6. Remove the nuts (1 and 3) that secure the A/C suction line (2) and A/C discharge line (4) to the A/C compressor.
7. Disconnect the refrigerant lines from the A/C compressor and remove and discard the seals.
8. Install plugs in, or tape over all of the opened refrigerant line fittings and the compressor ports.
9. Raise and support the vehicle.
10. Remove the front belly pan.
11. Remove the bolts (2 and 5) that secure the A/C compressor (6) to the engine.
12. Lower the vehicle.
13. Disconnect the engine wire harness from the A/C clutch electrical connector (1).
14. Support the A/C compressor, remove the nut (4) and stud (3) that secures the A/C compressor to the engine and remove the compressor.

3.6L ENGINE

Note. The A/C condenser must be replaced if an internal failure of the A/C compressor has occurred. Refer to CONDENSER, A/C, REMOVAL .

Note. The A/C compressor may be removed and repositioned without disconnecting the refrigerant lines or discharging the refrigerant system. Discharging is not necessary if servicing the A/C clutch, clutch coil or engine.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 102

Scheme 103

1. Disconnect and isolate the negative battery cable.
2. Remove the engine trim cover.
3. Recover the refrigerant from the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
4. Remove the air cleaner housing. Refer to «BODY, AIR CLEANER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. Remove the accessory drive belt. Refer to «BELT, SERPENTINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__removal) .
6. Remove the nuts (1 and 3) that secure the A/C suction line (2) and A/C discharge line (3) to the A/C compressor.
7. Disconnect the refrigerant lines from the A/C compressor and remove and discard the seals.
8. Install plugs in, or tape over all of the opened refrigerant line fittings and the compressor ports.
9. Disconnect the engine wire harness from the A/C compressor (2).
10. Remove the nut (5) and position the heater tube and bracket (4) out of the way.
11. Support the A/C compressor and remove the stud (3) and the three bolts (1).
12. Remove the A/C compressor from the engine compartment.

5.7L ENGINE

Note. The A/C condenser must be replaced if an internal failure of the A/C compressor has occurred. Refer to CONDENSER, A/C, REMOVAL .

Note. The A/C compressor may be removed and repositioned without disconnecting the refrigerant lines or discharging the refrigerant system. Discharging is not necessary if servicing the A/C clutch, clutch coil or engine.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 104

Scheme 105

1. Disconnect and isolate the negative battery cable.
2. Remove the air cleaner housing and resonator.
3. Recover the refrigerant from the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
4. Remove the accessory drive belt. Refer to «BELT, SERPENTINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__removal) .
5. Remove the nuts (2) that secure the A/C suction line (1) and A/C discharge line (3) to the A/C compressor.
6. Disconnect the refrigerant lines from the A/C compressor and remove and discard the seals.
7. Install plugs in, or tape over all of the opened refrigerant line fittings and the compressor ports.
8. Raise and support the vehicle.
9. Remove the front belly pan.
10. Disconnect the engine wire harness from the A/C clutch electrical connector (2).
11. Remove the two bolts (3) that secure the A/C compressor (1) to the engine.
12. Support the A/C compressor and remove the nut (5) and stud (4).
13. Remove the A/C compressor from the engine compartment.

Note. Typical A/C compressor and clutch assembly shown in illustrations.

Scheme 106

1. Align the dowel pin on the back of the A/C clutch coil (2) with the hole in the front of the A/C compressor (3) and install the coil onto the compressor. Depending on compressor application, be certain that the A/C clutch coil wire lead is properly routed so that it is not pinched between the A/C compressor and the coil. CAUTION: The snap ring must be fully and properly seated in the groove or it will vibrate out, resulting in a clutch failure and severe damage to the A/C compressor. NOTE: A new snap ring must be used to secure the A/C clutch coil to the A/C compressor. The bevel side of the snap ring must face outward. On Denso compressor models, both snap ring eyelets must be oriented to the right or to the left of the coil dowel pin location on the front of the A/C compressor.
2. Using A/C Snap Ring Pliers (special tool #9764, Pliers, A/C Snap Ring) (1) or equivalent, install the snap ring (4) that secures the A/C clutch coil to the A/C compressor. Be certain that the snap ring is fully and properly seated in the groove and oriented correctly. CAUTION: If required (depending on A/C compressor application), be certain to position the A/C clutch coil wire lead so that damage will not occur during A/C compressor pulley and bearing installation. CAUTION: When installing the pulley and bearing assembly, DO NOT mar the friction surfaces of the pulley or premature failure of the A/C clutch will result.
3. Install the pulley and bearing assembly (1) onto the A/C compressor. If necessary, tap the pulley gently with a block of wood (2) placed on the pulley friction surface. CAUTION: The snap ring must be fully and properly seated in the groove or it will vibrate out, resulting in a clutch failure and severe damage to the A/C compressor. NOTE: A new snap ring must be used to secure the pulley and bearing assembly to the A/C compressor. The bevel side of the snap ring must face outward.
4. Using A/C Snap Ring Pliers (special tool #9764, Pliers, A/C Snap Ring) (1) or equivalent, install the snap ring (2) that secures the pulley and bearing assembly (3) to the A/C compressor. Be certain that the snap ring is fully and properly seated in the groove.
5. If the original clutch plate (2) and pulley and bearing assembly are to be reused, reinstall the original shim(s) (3) onto the compressor shaft (1). If a new clutch plate and pulley and bearing assembly are being used, install a trial stack of shims 2.54 mm (0.010 in.) thick onto the compressor shaft.
6. Install the clutch plate (4) onto the front of the A/C compressor (5).
7. Install the compressor shaft bolt (3). Tighten the bolt to 19 N.m (168 in. lbs.). NOTE: The shims may compress after tightening the shaft bolt. Check the air gap in four or more places to verify the air gap is correct. Spin the pulley before performing a final check of the air gap. NOTE: On models with the clutch plate recessed into the pulley, use a 90° wire gap gauge to measure the clutch air gap. On other models, use a blade type feeler gauge to measure the air gap.
8. With the clutch plate assembled tight against the shim(s), measure the air gap between the clutch plate and the pulley and bearing assembly. The air gap should be between 0.35 - 0.60 mm (0.014 - 0.024 in.). If the air gap is not between specifications, add or subtract shims as needed until the correct air gap is obtained. CAUTION: If required (depending on A/C compressor application), be certain that the A/C clutch coil wire lead is properly routed so that it is not pinched between the A/C compressor and the coil connector bracket.
9. If required (depending on A/C compressor application), route the A/C clutch coil wire lead behind the connector bracket (2) and install the A/C clutch coil connector (1) to the bracket.
10. If removed, install the A/C compressor to the engine. Refer to «COMPRESSOR, A/C, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
11. Connect the engine wire harness to the A/C clutch coil connector.
12. Install the accessory drive belt. Refer to «BELT, SERPENTINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__installation) .
13. Reconnect the negative battery cable.

Note. The A/C condenser must be replaced if an internal failure of the A/C compressor has occurred. Refer to CONDENSER, A/C, REMOVAL .

Note. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be removed from the new A/C compressor. Refer to OIL, REFRIGERANT, STANDARD PROCEDURE .

Note. Replacement of the refrigerant line O-ring seals and gaskets is required anytime a refrigerant line is disconnected. Failure to replace the rubber O-ring seals and metal gaskets may result in a refrigerant system leak.

Note. LHD model shown in illustrations. RHD model similar.

1. If the A/C compressor (6) is being replaced, the refrigerant oil in the old compressor must be first drained and measured. Then the oil in the new A/C compressor must be drained. Finally, the new compressor must be refilled with the same amount of new refrigerant oil that was drained out of the old compressor. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
2. Position the A/C compressor to the engine and install the stud (3). Tighten the stud to 10 N.m (89 in. lbs.).
3. Install and hand tighten the nut (4) that secures the A/C compressor to the engine.
4. Raise and support the vehicle.
5. Install and hand tighten the two bolts (2 and 5) that secure A/C compressor to the engine. Tighten the bolts to 28 N.m (21 ft. lbs.).
6. Tighten the two bolts to 28 N.m (21 ft. lbs.) using the following sequence: Bolt at rear of compressor. Bolt at front of compressor.
7. Install the belly pan.
8. Lower the vehicle.
9. Tighten the nut at the front of the A/C compressor to 28 N.m (21 ft. lbs.).
10. Connect the engine wire harness to the A/C clutch electrical connector (1).
11. Remove the tape or plugs from the opened refrigerant line fittings and the compressor ports.
12. Lubricate new seals with clean refrigerant oil and install them onto the refrigerant line fittings. Use only the specified seals as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
13. Connect the A/C suction line (2) and the A/C discharge line (4) to the A/C compressor (4).
14. Install the nuts (1 and 3) that secure the refrigerant lines to the A/C compressor. Tighten the nuts to 20 N.m (15 ft. lbs.). NOTE: The A/C condenser must be replaced if an internal failure of the A/C compressor has occurred. Refer to «CONDENSER, A/C, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
15. Install the accessory drive belt. Refer to «BELT, SERPENTINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__installation) .
16. Install the engine air cleaner housing and connect the wire harness to the mass air flow sensor. Refer to «BODY, AIR CLEANER, INSTALLATION»(ref-466389-S06925811102012042500000) .
17. Evacuate and charge the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
18. Install the engine trim cover.
19. Reconnect the negative battery cable.

Note. The A/C condenser must be replaced if an internal failure of the A/C compressor has occurred. Refer to CONDENSER, A/C, REMOVAL .

Note. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be removed from the new A/C compressor. Refer to OIL, REFRIGERANT, STANDARD PROCEDURE .

Note. Replacement of the refrigerant line O-ring seals and gaskets is required anytime a refrigerant line is disconnected. Failure to replace the rubber O-ring seals and metal gaskets may result in a refrigerant system leak.

Note. LHD model shown in illustrations. RHD model similar.

1. If the A/C compressor (2) is being replaced, the refrigerant oil in the old compressor must be first drained and measured. Then the oil in the new A/C compressor must be drained. Finally, the new compressor must be refilled with the same amount of new refrigerant oil that was drained out of the old compressor. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
2. Position the A/C compressor to the engine and install the stud (3). Tighten the stud to 10 N.m (89 in. lbs.).
3. Loosely install the three bolts (1) that secure the A/C compressor to the engine.
4. Reposition the heater tube and bracket (4) onto the stud and install the loosely install the nut (5).
5. Tighten the bolts and nut to 28 N.m (21 ft. lbs.) using the following sequence: Upper bolt at front of compressor. Lower bolt at front of compressor. Bolt at rear of compressor. Nut at rear of compressor.
6. Connect the engine wire harness to the A/C compressor.
7. Remove the tape or plugs from the opened refrigerant line fittings and the compressor ports.
8. Lubricate new seals with clean refrigerant oil and install them onto the refrigerant line fittings. Use only the specified seals as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
9. Install the A/C suction line (2) and the A/C discharge line (4) onto the A/C compressor.
10. Install the nuts (1 and 3) that secure the refrigerant lines to the A/C compressor. Tighten the nuts to 20 N.m (15 ft. lbs.).
11. Install the accessory drive belt. Refer to «BELT, SERPENTINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__installation) . NOTE: The A/C condenser must be replaced if an internal failure of the A/C compressor has occurred. Refer to «CONDENSER, A/C, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
12. Install the air cleaner housing. Refer to «BODY, AIR CLEANER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
13. Reconnect the negative battery cable.
14. Evacuate and charge the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
15. Install the engine trim cover

Note. The A/C condenser must be replaced if an internal failure of the A/C compressor has occurred. Refer to CONDENSER, A/C, REMOVAL .

Note. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be removed from the new A/C compressor. Refer to OIL, REFRIGERANT, STANDARD PROCEDURE .

Note. Replacement of the refrigerant line O-ring seals and gaskets is required anytime a refrigerant line is disconnected. Failure to replace the rubber O-ring seals and metal gaskets may result in a refrigerant system leak.

Note. LHD model shown in illustrations. RHD model similar.

1. If the A/C compressor (1) is being replaced, the refrigerant oil in the old compressor must be first drained and measured. Then the oil in the new A/C compressor must be drained. Finally, the new compressor must be refilled with the same amount of new refrigerant oil that was drained out of the old compressor. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
2. Position the A/C compressor to the engine and install the stud (4). Tighten the stud to 10 N.m (89 in. lbs.).
3. Loosely install the two bolts (3) and one nut (5) that secure the A/C compressor to the engine.
4. Tighten the nut and bolts to 28 N.m (21 ft. lbs.) using the following sequence: Nut at front of compressor. Bolt at front of compressor. Bolt at rear of compressor.
5. Connect the engine wire harness to the A/C clutch electrical connector (2).
6. Install the front belly pan.
7. Lower the vehicle.
8. Remove the tape or plugs from the opened refrigerant line fittings and the compressor ports.
9. Lubricate new seals with clean refrigerant oil and install them onto the refrigerant line fittings. Use only the specified seals as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
10. Install the A/C suction line (1) and the A/C discharge line (3) onto the A/C compressor.
11. Install the nuts (2) that secure the refrigerant lines to the A/C compressor. Tighten the nuts to 20 N.m (15 ft. lbs.).
12. Install the accessory drive belt. Refer to «BELT, SERPENTINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__installation) . NOTE: The A/C condenser must be replaced if an internal failure of the A/C compressor has occurred. Refer to «CONDENSER, A/C, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
13. Install the resonator and air cleaner housing.
14. Reconnect the negative battery cable.
15. Evacuate and charge the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .

Note. Gasoline engine model shown in illustration. Diesel engine model similar.

Scheme 107

The A/C condenser (1) is located at the front of the engine compartment, behind the grille. The A/C condenser is a heat exchanger that allows the high-pressure refrigerant gas being discharged by the A/C compressor to give up its heat to the air passing over the condenser fins, which causes the refrigerant to cool and change to a liquid state.

The A/C condenser is equipped with integral mounting tabs (2 and 7), a tapping block for the A/C discharge and liquid lines (3), mounting provisions for the power steering cooler (4), an integral A/C receiver/drier (5), and an integral automatic transmission cooler with a tapping block (6) for the transmission cooler lines.

When air passes through the fins of the A/C condenser, the high-pressure refrigerant gas within the A/C condenser gives up its heat. The refrigerant then condenses as it leaves the A/C condenser and becomes a high-pressure liquid. The volume of air flowing over the condenser fins is critical to the proper cooling performance of the A/C system. Therefore, it is important that there are no objects placed in front of the radiator grille openings at the front of the vehicle or foreign material on the condenser fins that might obstruct proper air flow. Also, any factory-installed air seals or shrouds must be properly reinstalled following radiator or A/C condenser service.

Note. Replacement of the refrigerant line O-ring seals and gaskets is required anytime a refrigerant line is disconnected. Failure to replace the rubber O-ring seals and metal gaskets could result in a refrigerant system leak.

The A/C condenser has no serviceable parts. The O-ring seals used on the connections are made from a special type of rubber not affected by R-134a refrigerant. The O-ring seals and gaskets must be replaced whenever a refrigerant line is disconnected from the A/C condenser.

The A/C condenser cannot be repaired and must be replaced if leaking or damaged.

Scheme 108

Scheme 109

Scheme 110

1. Disconnect and isolate the negative battery cable.
2. On 5.7L and 3.6L models, remove the air cleaner housing, air intake tube and resonator, as equipped.
3. Remove the engine trim cover, if equipped.
4. Recover the refrigerant from the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
5. Remove the grille. Refer to «GRILLE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
6. Remove the bolt (2) that secures the A/C liquid line (5) to the upper radiator support.
7. Remove the nut (6) that secures the A/C discharge line (4) and A/C liquid line to the A/C condenser (1).
8. Disconnect the A/C discharge line and A/C liquid line from the A/C condenser and remove and discard the seals.
9. Install plugs in, or tape over the opened refrigerant line fittings and the condenser ports. NOTE: Illustration shown with radiator removed from view for clarity.
10. Remove the hood latch assembly from the radiator crossmember and position it out of the way. Refer to «LATCH, HOOD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
11. Disengage the two plastic air dams from the front of engine compartment and position them out of the way.
12. Position the two radiator crossmember support bars out of the way.
13. Disconnect the automatic transmission cooler lines (1) from the transmission fluid cooler (2). Refer to «TUBES AND HOSES, TRANSMISSION OIL COOLER, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
14. Install plugs in, or tape over the automatic transmission cooler line fittings and the fluid cooler ports.
15. If equipped with 3.0L diesel engine, remove the charge air cooler.
16. If equipped, remove the power steering fluid cooler (3) from the A/C condenser (4) and position it out of the way. Refer to «COOLER, POWER STEERING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/manual-power-steering/#steering-system) .
17. Disengage the two retaining tabs (1 and 2) that secure A/C condenser to the radiator.
18. Tip the A/C condenser forward and carefully remove from engine compartment.

Note. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to OIL, REFRIGERANT, STANDARD PROCEDURE .

Note. If only the A/C condenser is being replaced, add 30 milliliters (1 fluid ounce) of refrigerant oil to the refrigerant system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.

Note. Replacement of the refrigerant line seals is required anytime a refrigerant line is disconnected. Failure to replace the rubber and metal seals could result in a refrigerant system leak.

Note. Be certain that each of the radiator and condenser air dams are installed in their proper locations. These air dams are required for the A/C and engine cooling systems to perform as designed.

1. Position the A/C condenser (4) into the engine compartment.
2. Engage the two retaining tabs (1 and 2) that secure A/C condenser to the radiator.
3. If equipped, install the power steering fluid cooler (3) onto the A/C condenser. Refer to «COOLER, POWER STEERING, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/manual-power-steering/#steering-system) .
4. If equipped with 3.0L diesel engine, install the charge air cooler. NOTE: Illustration shown with radiator removed from view for clarity.
5. Remove the tape or plugs from the automatic transmission cooler line fittings and the fluid cooler ports.
6. Connect the automatic transmission cooler lines (1) to the transmission fluid cooler (2).
7. Reposition the two radiator crossmember support bars.
8. Reposition the two plastic air dams to the front of engine compartment and install the push-pin retainers.
9. Install the hood latch assembly to the radiator crossmember. Refer to «LATCH, HOOD, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
10. Remove the tape or plugs from the opened refrigerant line fittings and the condenser ports.
11. Lubricate new seals with clean refrigerant oil and install them onto the refrigerant line fittings. Use only the specified seals as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
12. Connect the A/C liquid line (5) and A/C discharge line (4) to the A/C condenser (1).
13. Install the nut (6) that secures the A/C discharge and liquid line to the A/C condenser. Tighten the nut to 20 N.m (15 ft. lbs.).
14. Install the bolt (2) that secures the A/C liquid line to the upper radiator support. Tighten the bolt securely.
15. Install the grille. Refer to «GRILLE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
16. On 5.7L and 3.6L models, install the air cleaner housing, air intake tube and resonator, as equipped.
17. Install the engine trim cover, if equipped.
18. Reconnect the negative battery cable.
19. Evacuate the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
20. If the A/C condenser is being replaced, add 30 milliliters (1 fluid ounce) of refrigerant oil to the refrigerant system. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
21. Charge the refrigerant system. Refer to «REFRIGERANT SYSTEM CHARGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__refrigerant-system-charge) .
22. Check the automatic transmission fluid level and refill as required.

Note. LHD model shown in illustration. RHD model similar.

Scheme 111

The heater core (1) is mounted into the left side of the HVAC air distribution housing, which is located behind the instrument panel. The heater core is a heat exchanger made of rows of aluminum tubes and fins. The heater core is positioned within the air distribution housing so that only the selected amount of air entering the housing passes through the heater core, before being distributed through the heater-A/C system ducts and outlets. One end of the heater core is fitted with a tank (2) that includes the fittings for the heater core tubes (3)

The heater core can be serviced without removing the HVAC housing from the vehicle.

When the engine is running, engine coolant is circulated at all times from the engine through hoses to the heater core. As the coolant flows through the engine and into the heater core, heat is removed from the engine and transferred to the heater core tubes and fins. Air is directed through the heater core and picks up the heat from the heater core fins and tubes and becomes distributed into the HVAC air distribution housing. The blend-air doors allow control of the output air temperature by regulating the amount of air flowing through the heater core. The blower motor speed controls the volume of air flowing through the HVAC housing.

The heater core cannot be repaired and must be replaced if restricted, leaking or damaged.

Note. Take the proper precautions to protect the front face of the instrument panel from cosmetic damage while performing this procedure.

Note. LHD model shown in illustrations. RHD model similar.

Scheme 112

1. Disconnect and isolate the negative battery cable.
2. Drain the engine cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
3. Remove the passenger side instrument panel silencer.
4. Remove the glove box, glove box shelf and the trim panel, located behind the glove box. Refer to «GLOVE BOX, INSTRUMENT PANEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
5. Remove the nut (1) that secures the passenger side end of the HVAC housing (3) to the instrument panel support (2).
6. Remove the front floor console. Refer to «CONSOLE, FLOOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
7. Remove the radio. Refer to «RADIO, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/entertainment-systems/#audio-and-video-service-information) .
8. Remove the bin from the center of the instrument panel.
9. Remove the four nuts (1) that secure the HVAC housing to the center of the instrument panel support. NOTE: Illustration shown with instrument panel removed from view for clarity.
10. On LHD, remove the driver side instrument panel silencer.
11. Remove the push pin (3) that secures the left side floor ducts (1) to the instrument panel.
12. Disconnect the left side floor ducts from the HVAC housing (2). NOTE: Removal of the instrument panel from the vehicle is not required to perform this procedure. It is only necessary to position the instrument panel so that removal of the heater core is possible.
13. Position the instrument panel to gain full access to the heater core located on the left side of the HVAC air distribution housing. Refer to «PANEL, INSTRUMENT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) . NOTE: Take proper precautions to protect the carpeting from engine coolant. Have absorbent toweling readily available to clean up any spills.
14. Remove the two clamps (2 and 6) that secure the heater tubes (1) to the heater core (3).
15. Disconnect the heater core tubes from the heater core and remove and discard the O-ring seals.
16. Install plugs in, or tape over the opened heater core tubes and heater core ports.
17. Remove the screw (7) that secures the heater core retaining bracket (5) to the air distribution housing and position the bracket out of the way. NOTE: If the foam seal around the heater core is deformed or damaged, it must be replaced.
18. Carefully pull the heater core out of the air distribution housing.

Note. LHD model shown in illustrations. RHD model similar.

1. Carefully install the heater core (3) into the left side of the HVAC air distribution housing (4).
2. Reposition the heater core retaining bracket (5) and install the screw (7). Tighten the screw to 2.2 N.m (20 in. lbs.).
3. Remove the tape or plugs from the heater core tubes (1) and heater core ports.
4. Lubricate new rubber O-ring seals with clean engine coolant and install them onto the heater core tubes. Use only the specified O-ring as they are made of a special material for the engine cooling system.
5. Connect the heater core tubes to the heater core.
6. Install the two clamps (2 and 6) that secure the heater core tubes to the heater core. Tighten the screws on the clamps to 1.7 N.m (15 in. lbs.). NOTE: Illustration shown with instrument panel removed from view for clarity.
7. Connect the left side floor ducts to the HVAC housing (2).
8. Reposition and install the instrument panel as necessary. Refer to «PANEL, INSTRUMENT, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
9. Install the push pin (3) that secures the left side floor ducts to the instrument panel.
10. On LHD models, install the driver side instrument panel silencer.
11. Install the four nuts (1) that secure the HVAC housing to the center of the instrument panel support. Tighten the nuts to 4.5 N.m (40 in. lbs.).
12. Install the bin into the center of the instrument panel.
13. Install the radio. Refer to «RADIO, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/entertainment-systems/#audio-and-video-service-information) .
14. Install the floor console. Refer to «CONSOLE, FLOOR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
15. Install the nut (1) that secures the passenger side end of the HVAC housing (3) to the instrument panel support (2). Tighten the nut to 4.5 N.m (40 in. lbs.).
16. Install the IP trim panel, glove box shelf and the glove box. Refer to «GLOVE BOX, INSTRUMENT PANEL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
17. Install the passenger side instrument panel silencer.
18. Reconnect the negative battery cable.
19. If the heater core is being replaced, flush the cooling system. Refer to «REVERSE FLUSHING»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__reverse-flushing) .
20. Refill the engine cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .

Scheme 113

The high side service port (1) is located on the A/C liquid line, near the upper radiator support. The low side service port (2) is located on the A/C suction line, near the left strut tower. Refrigerant system service ports are used to recover, recycle, evacuate, charge and test the A/C refrigerant system. Unique sizes are used on the two service ports for the R-134a refrigerant system to ensure the proper connections are made when using refrigerant system service equipment, and that the system is not accidentally contaminated with R-12 refrigerant, or by service equipment used for R-12 refrigerant.

Note. Protective caps aid in service port sealing and help protect the refrigerant system from contamination. Remember to always reinstall the protective caps onto the service ports when refrigerant system service is complete.

Each of the service ports has a threaded plastic protective cap installed over it from the factory.

The high side and low side A/C service port valve cores and the protective caps are serviceable items.

Scheme 114

Note. Typical A/C service port shown in illustration.

1. Remove the protective cap (1) from the service port (2).
2. Recover the refrigerant from the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
3. Using a Schrader-type valve core tool, remove the valve core (3) from the service port.
4. Install a plug in, or tape over the opened service port(s).

Note. Typical A/C service port shown in illustration.

1. Lubricate the valve core (3) with clean refrigerant oil prior to installation. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
2. Remove the tape or plug from the service port (2). CAUTION: Damage may result to a service port valve core if the valve core is not fully seated in the A/C service port. Such damage can result in a loss of refrigerant.
3. Install and tighten the valve core into the service port(s) using a Schrader type valve core tool.
4. Evacuate and charge the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . NOTE: The protective cap helps aid in service port sealing and helps protect the refrigerant system from contamination. Remember to always reinstall the protective cap onto the service port when refrigerant system service is complete.
5. Install the protective cap (1) onto the service port.

Note. Gasoline engine model shown in illustration. Diesel engine model similar.

The A/C receiver/drier (5) stores unnecessary refrigerant, filters the refrigerant, helps remove moisture from the refrigerant and retains any refrigerant vapor that may leave the A/C condenser (1) until it becomes a liquid. The A/C receiver/drier is on the high-side of the A/C system and is located on the left side of the A/C condenser.

The A/C receiver/drier is integral to the A/C condenser and must be replaced with the condenser as an assembly.

The A/C receiver/drier performs a filtering action to prevent foreign material that may be in the refrigerant from contaminating the A/C expansion valve and the A/C compressor. Refrigerant enters the A/C receiver/drier as a high-pressure, low temperature liquid. Desiccant inside the A/C receiver/drier absorbs any moisture which may have entered and become trapped within the refrigerant system. In addition, during periods of high demand operation of the A/C system, the A/C receiver/drier acts as a reservoir to store surplus refrigerant.

The A/C receiver/drier is integral to the A/C condenser and has no serviceable parts.

The A/C receiver/drier cannot be repaired and the A/C condenser must be replaced if the receiver/drier is leaking or damaged, or if an internal failure of the A/C compressor has occurred. Refer to CONDENSER, A/C, REMOVAL .

Note. LHD model shown in illustration. RHD model similar.

Scheme 115

The A/C evaporator (1) for the heating-A/C system is located within the HVAC housing, behind the instrument panel. The A/C evaporator and insulator (2) are positioned in the HVAC housing so that all air entering the housing must pass over the evaporator fins before it is distributed through the heating-A/C system ducts and outlets. However, air passing over the evaporator fins will only be conditioned when the A/C compressor is engaged and circulating refrigerant through the A/C evaporator.

The A/C evaporator tubes (4) are connected and sealed to the A/C expansion valve by use of rubber O-rings (5) and a tapping block (3).

The A/C evaporator can only be serviced by removing and disassembling the HVAC housing assembly.

Refrigerant enters the A/C evaporator from the A/C expansion valve as a low-temperature, low-pressure mixture of liquid and gas. As air flows over the fins of the A/C evaporator, the humidity in the air condenses on the fins, and the heat from the air is absorbed by the refrigerant. Heat absorption causes the refrigerant to boil and vaporize. The refrigerant becomes a low-pressure gas when it leaves the A/C evaporator.

Note. Replacement of the refrigerant line O-ring seals and gaskets is required anytime a refrigerant line or expansion valve is disconnected. Failure to replace the rubber O-ring seals and metal gaskets could result in a refrigerant system leak.

The A/C evaporator has no serviceable parts except for the O-ring seals. The O-ring seals used on the connections are made from a special type of rubber not affected by R-134a refrigerant. The O-ring seals must be replaced whenever the A/C expansion valve is removed from the A/C evaporator.

The A/C evaporator cannot be repaired and must be replaced if leaking or damaged.

Note. LHD model shown in illustration. RHD model similar.

1. Remove the HVAC housing assembly. Refer to «HOUSING, HVAC, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
2. Disassemble the HVAC housing as necessary to access the A/C evaporator (2). Refer to «HOUSING, HVAC, DISASSEMBLY»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
3. Remove the tapping block (1) from the evaporator tubes.
4. Lift the A/C evaporator and insulator (3) out of the lower half of the HVAC housing (4).
5. If required, remove the insulator from the A/C evaporator. If the insulator is deformed or damaged, it must be replaced.

Note. If the A/C evaporator is being replaced, add 60 milliliters (2 fluid ounces) of refrigerant oil to the refrigerant system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.

Note. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to OIL, REFRIGERANT, STANDARD PROCEDURE .

Note. Replacement of the refrigerant line seals is required anytime the A/C expansion valve is removed from the A/C evaporator. Failure to replace the rubber and metal seals may result in a refrigerant system leak.

Note. LHD model shown in illustration. RHD model similar.

1. If removed, install the insulator (3) over the A/C evaporator (2). If the insulator is deformed or damaged, it must be replaced.
2. Install the A/C evaporator into the lower half of the HVAC housing (4). Make sure that the evaporator drain within the HVAC housing is clean and unrestricted and that the insulator and evaporator are properly positioned in the housing.
3. Install the tapping block (1) onto the evaporator tubes.
4. Assemble the HVAC housing. Refer to «HOUSING, HVAC, ASSEMBLY»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
5. Install the HVAC housing assembly. Refer to «HOUSING, HVAC, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
6. If the A/C evaporator is being replaced, add 60 milliliters (2 fluid ounces) of refrigerant oil to the refrigerant system. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.

Note. 5.7L engine model shown in illustrations. Other models similar.

1. Disconnect and isolate the negative battery cable.
2. On 5.7L and 3.6L models, remove the air cleaner housing, air intake tube and resonator, as equipped.
3. Remove the engine trim cover, if equipped.
4. Recover the refrigerant from the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
5. Remove the grille. Refer to «GRILLE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
6. Disconnect the engine wire harness from the A/C pressure transducer (3) and remove the transducer from the A/C discharge line (4), if required. Refer to «TRANSDUCER, A/C PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
7. Remove the bolt (2) that secures the A/C liquid line (5) to the upper radiator support.
8. Remove the nut (6) that secures the A/C discharge line and A/C liquid line to the A/C condenser (1).
9. Disconnect the A/C discharge line and A/C liquid line from the A/C condenser.
10. Separate the liquid line fitting from the discharge line fitting and remove and discard the seals.
11. Remove the nut (2) that secures the A/C discharge line (3) to the A/C compressor.
12. Disconnect the A/C discharge line from the A/C compressor and remove and discard the seal.
13. Remove the A/C discharge line from the engine compartment.
14. Install plugs in, or tape over the opened refrigerant line fittings and the compressor and condenser ports.

Note. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to OIL, REFRIGERANT, STANDARD PROCEDURE .

Note. Replacement of the refrigerant line seals is required anytime a refrigerant line is disconnected. Failure to replace the rubber and metal seals could result in a refrigerant system leak.

Note. 5.7L engine model shown in illustrations. Other models similar.

1. Position the A/C discharge line (3) into the engine compartment.
2. Remove the tape or plugs from the opened refrigerant line fittings and the compressor and condenser ports.
3. Lubricate new seals with clean refrigerant oil and install them onto the refrigerant line fittings. Use only the specified seals as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
4. Connect the A/C discharge line to the A/C compressor.
5. Install the nut (2) that secures the A/C discharge line to the A/C compressor. Tighten the nut to 20 N.m (15 ft. lbs.).
6. Engage the A/C liquid line (5) to the A/C discharge line (4) and connect the lines to the A/C condenser (1).
7. Install the nut (6) that secures the A/C discharge and liquid lines to the A/C condenser. Tighten the nut to 20 N.m (15 ft. lbs.).
8. Install the bolt (2) that secures the A/C liquid line to the upper radiator support. Tighten the bolt securely.
9. If removed, install the A/C pressure transducer (3) onto the A/C discharge line. Tighten the A/C pressure transducer to 5.1 N.m (45 in. lbs.).
10. Connect the engine wire harness to the A/C pressure transducer.
11. Install the grille. Refer to «GRILLE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
12. On 5.7L and 3.6L models, install the air cleaner housing, air intake tube and resonator, as equipped.
13. Install the engine trim cover, if equipped.
14. Reconnect the negative battery cable.
15. Evacuate the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
16. Adjust the refrigerant oil level. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
17. Charge the refrigerant system. Refer to «REFRIGERANT SYSTEM CHARGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__refrigerant-system-charge) .

Note. The A/C liquid line is serviced in two sections.

Note. LHD model with 5.7L engine shown in illustrations. RHD model and other engines similar.

Scheme 116

1. Disconnect and isolate the negative battery cable.
2. On 5.7L and 3.6L models, remove the air cleaner housing, air intake tube and resonator, as equipped.
3. Remove the engine trim cover, if equipped.
4. Recover the refrigerant from the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
5. Remove the nut (2) that secures the front section of the A/C liquid line (3) to the rear section of the A/C liquid line (1).
6. Disconnect the A/C liquid lines from each other and remove and discard the seal.
7. Remove the grille. Refer to «GRILLE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
8. Remove the bolt (2) that secures the front section of the A/C liquid line (5) to the upper radiator support.
9. Remove the nut (6) that secures the A/C discharge line (4) and A/C liquid line to the A/C condenser (1).
10. Disconnect the A/C discharge line and A/C liquid line from the A/C condenser.
11. Separate the A/C liquid line from the A/C discharge line and remove and discard the seals.
12. Remove the front section of the A/C liquid line from the engine compartment.
13. Install plugs in, or tape over all the opened refrigerant line fittings and the condenser ports.

REAR

Note. The rear section of the A/C liquid line is only serviced with the rear section of the A/C suction line.

Scheme 117

Scheme 118

1. Disconnect and isolate the negative battery cable.
2. On 5.7L and 3.6L models, remove the air cleaner housing, air intake tube and resonator, as equipped.
3. Remove the engine trim cover, if equipped.
4. Recover the refrigerant from the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
5. Remove the evaporative emissions purge solenoid valve from the A/C liquid and suction line bracket located on the left front strut tower and position it out of the way. Refer to «SOLENOID, EVAPORATIVE EMISSIONS PURGE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) .
6. Remove the nut (2) that secures the front section of the A/C suction line (3) to the rear section of the A/C suction line (1).
7. Disconnect the A/C suction lines from each other and remove and discard the seal.
8. Remove the nut (2) that secures the front section of the A/C liquid line (3) to the rear section of the A/C liquid line (1).
9. Disconnect the A/C liquid lines from each other and remove and discard the seal.
10. Remove the windshield wiper arms and wiper module. Refer to «LINKAGE, WIPER ARM, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/wiperwasher-systems/#wiper-system-washer-system-service-information) .
11. Remove the cowl extension silencer. Refer to «SILENCER, COWL EXTENSION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
12. Remove the nut (2) that secures the A/C liquid and suction line assembly (1) to the stud (3) located on the left front strut tower.
13. Remove the bolt (4) that secures the A/C liquid and suction line assembly to the cowl panel bracket.
14. Remove the nut (6) that secures the A/C liquid and suction line assembly to the A/C expansion valve (5).
15. Disengage the A/C liquid and suction line assembly from the stud located on the strut tower.
16. Disconnect the A/C liquid and suction line assembly from the A/C expansion valve.
17. Remove the A/C liquid and suction line assembly from the engine compartment and remove and discard the seals.
18. Install plugs in, or tape over all the opened refrigerant line fittings and expansion valve ports.

Note. When replacing multiple A/C system components, refer to the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to OIL, REFRIGERANT, STANDARD PROCEDURE .

Note. Replacement of the refrigerant line O-ring seals and gaskets is required anytime a refrigerant line is disconnected. Failure to replace the rubber O-ring seals and metal gaskets could result in a refrigerant system leak.

Note. LHD model with 5.7L engine shown in illustrations. RHD model and other engines similar.

FRONT

1. Position the front section of the A/C liquid line (5) into the engine compartment.
2. Remove the tape or plugs from the opened refrigerant line fittings and the condenser ports.
3. Lubricate new seals with clean refrigerant oil and install them onto the refrigerant line fittings. Use only the specified seals as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
4. Engage the A/C liquid line to the A/C discharge line (4) and connect the lines to the A/C condenser (1).
5. Install the nut (6) that secures the A/C discharge and liquid lines to the A/C condenser. Tighten the nut to 20 N.m (15 ft. lbs.).
6. Install the bolt (2) that secures the A/C liquid line to the upper radiator support. Tighten the bolt securely.
7. Install the grille. Refer to «GRILLE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
8. Connect the front section of the A/C liquid line (3) to the rear section of the A/C liquid line (1).
9. Install the nut (2) that secures the two sections of the A/C liquid line together. Tighten the nut to 20 N.m (15 ft. lbs.).
10. On 5.7L and 3.6L models, install the air cleaner housing, air intake tube and resonator, as equipped.
11. Install the engine trim cover, if equipped.
12. Reconnect the negative battery cable.
13. Evacuate the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
14. Adjust the refrigerant oil level. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
15. Charge the refrigerant system. Refer to «REFRIGERANT SYSTEM CHARGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__refrigerant-system-charge) .

Note. The rear section of the A/C liquid line is only serviced with the rear section of the A/C suction line.

1. Position the A/C liquid and suction line assembly (1) into the engine compartment.
2. Remove the tape or plugs from the opened refrigerant line fittings and the expansion valve ports.
3. Lubricate new seals with clean refrigerant oil and install them onto the refrigerant line fittings. Use only the specified seals as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
4. Connect the A/C liquid and suction line assembly to the A/C expansion (5).
5. Engage the A/C liquid and suction line assembly to stud (3) located on the left front strut tower.
6. Install the nut (6) that secures the A/C liquid and suction line assembly to the A/C expansion valve. Tighten the nut to 20 N.m (15 ft. lbs.).
7. Install the bolt (4) that secures the A/C liquid and suction line assembly to the cowl panel bracket. Tighten the bolt securely.
8. Install the nut (2) that secures the A/C liquid and suction line assembly to the stud located on the strut tower. Tighten the nut securely.
9. Install the cowl extension silencer. Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
10. Install the windshield wiper module and arms. Refer to «LINKAGE, WIPER ARM, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/wiperwasher-systems/#wiper-system-washer-system-service-information) .
11. Connect the front section of the A/C liquid line (3) to the rear section of the A/C liquid line (1).
12. Install the nut (2) that secures the two sections of the A/C liquid line together. Tighten the nut to 20 N.m (15 ft. lbs.).
13. Connect the front section of the A/C suction line (3) to the rear section of the A/C suction line (1).
14. Install the nut (2) that secures the two sections of the A/C suction line together. Tighten the nut to 20 N.m (15 ft. lbs.).
15. Install the evaporative emissions purge solenoid valve. Refer to «SOLENOID, EVAPORATIVE EMISSIONS PURGE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) .
16. On 5.7L and 3.6L models, install the air cleaner housing, air intake tube and resonator, as equipped.
17. Install the engine trim cover, if equipped.
18. Reconnect the negative battery cable.
19. Evacuate the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
20. Adjust the refrigerant oil level. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
21. Charge the refrigerant system. Refer to «REFRIGERANT SYSTEM CHARGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__refrigerant-system-charge) .

Note. The A/C liquid line is serviced in two sections.

Note. LHD model with 5.7L engine shown in illustrations. RHD model and other engines similar.

1. Disconnect and isolate the negative battery cable.
2. On 5.7L and 3.6L models, remove the air cleaner housing, air intake tube and resonator, as equipped.
3. Remove the engine trim cover, if equipped.
4. Recover the refrigerant from the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
5. Remove the nut (2) that secures the front section of the A/C suction line (3) to the rear section of the A/C suction line (1).
6. Disconnect the A/C suction lines from each other and remove and discard the seal.
7. Remove the nut (2) that secures the A/C suction line (1) to the A/C compressor.
8. Disconnect the A/C suction line from the A/C compressor and remove and discard the seal.
9. Remove the front section of the A/C suction line from the engine compartment.
10. Install plugs in, or tape over all of the opened refrigerant line fittings and the compressor port.

Note. The rear section of the A/C suction line is only serviced with the rear section of the A/C liquid line.

1. Disconnect and isolate the negative battery cable.
2. On 5.7L and 3.6L models, remove the air cleaner housing, air intake tube and resonator, as equipped.
3. Remove the engine trim cover, if equipped.
4. Recover the refrigerant from the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
5. Remove the evaporative emissions purge solenoid valve from the A/C liquid and suction line bracket located on the left front strut tower and position it out of the way. Refer to «SOLENOID, EVAPORATIVE EMISSIONS PURGE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) .
6. Remove the nut (2) that secures the front section of the A/C suction line (3) to the rear section of the A/C suction line (1).
7. Disconnect the A/C suction lines from each other and remove and discard the seal.
8. Remove the nut (2) that secures the front section of the A/C liquid line (3) to the rear section of the A/C liquid line (1).
9. Disconnect the A/C liquid lines from each other and remove and discard the seal.
10. Remove the windshield wiper arms and wiper module. Refer to «LINKAGE, WIPER ARM, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/wiperwasher-systems/#wiper-system-washer-system-service-information) .
11. Remove the cowl extension silencer. Refer to «SILENCER, COWL EXTENSION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
12. Remove the nut (2) that secures the A/C suction and liquid line assembly (1) to the stud (3) located on the left front strut tower.
13. Remove the bolt (4) that secures the A/C suction and liquid line assembly to the cowl panel bracket.
14. Remove the nut (6) that secures the A/C suction and liquid line assembly to the A/C expansion valve (5).
15. Disengage the A/C suction and liquid line assembly from the stud located on the strut tower.
16. Disconnect the A/C suction and liquid line assembly from the A/C expansion valve.
17. Remove the A/C suction and liquid line assembly from the engine compartment and remove and discard the seals.
18. Install plugs in, or tape over all the opened refrigerant line fittings and expansion valve ports.

Note. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to OIL, REFRIGERANT, STANDARD PROCEDURE .

Note. Replacement of the refrigerant line seals is required anytime a refrigerant line is disconnected. Failure to replace the rubber and metal seals could result in a refrigerant system leak.

Note. LHD model with 5.7L engine shown in illustrations. RHD model and other engines similar.

1. Position the front section of the A/C suction line (2) into the engine compartment.
2. Remove the tape or plugs from the opened refrigerant line fittings and the compressor port.
3. Lubricate new seals with clean refrigerant oil and install them onto the refrigerant line fittings. Use only the specified seals as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
4. Connect the A/C suction line to the A/C compressor (4).
5. Install the nut (5) that secures the A/C suction line to the A/C compressor. Tighten the nut to 20 N.m (15 ft. lbs.).
6. Connect the front section of the A/C suction line (3) to the rear section of the A/C suction line (1).
7. Install the nut (2) that secures the two sections of the A/C suction line together. Tighten the nut to 20 N.m (15 ft. lbs.).
8. On 5.7L and 3.6L models, install the air cleaner housing, air intake tube and resonator, as equipped.
9. Install the engine trim cover, if equipped.
10. Reconnect the negative battery cable.
11. Evacuate the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
12. Adjust the refrigerant oil level. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
13. Charge the refrigerant system. Refer to «REFRIGERANT SYSTEM CHARGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__refrigerant-system-charge) .

Note. The rear section of the A/C suction line is only serviced with the rear section of the A/C liquid line.

1. Position the A/C suction and liquid line assembly (1) into the engine compartment.
2. Remove the tape or plugs from the opened refrigerant line fittings and the expansion valve ports.
3. Lubricate new seals with clean refrigerant oil and install them onto the refrigerant line fittings. Use only the specified seals as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
4. Connect the A/C suction and liquid line assembly to the A/C expansion (5).
5. Engage the A/C suction and liquid line assembly to stud (3) located on the left front strut tower.
6. Install the nut (6) that secures the A/C suction and liquid line assembly to the A/C expansion valve. Tighten the nut to 20 N.m (15 ft. lbs.).
7. Install the bolt (4) that secures the A/C suction and liquid line assembly to the cowl panel bracket. Tighten the bolt securely.
8. Install the nut (2) that secures the A/C suction and liquid line assembly to the stud located on the strut tower. Tighten the nut securely.
9. Install the cowl extension silencer. Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
10. Install the windshield wiper module and arms. Refer to «LINKAGE, WIPER ARM, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/wiperwasher-systems/#wiper-system-washer-system-service-information) .
11. Connect the front section of the A/C liquid line (3) to the rear section of the A/C liquid line (1).
12. Install the nut (2) that secures the two sections of the A/C liquid line together. Tighten the nut to 20 N.m (15 ft. lbs.).
13. Connect the front section of the A/C suction line (3) to the rear section of the A/C suction line (1).
14. Install the nut (2) that secures the two sections of the A/C suction line together. Tighten the nut to 20 N.m (15 ft. lbs.).
15. Install the evaporative emissions purge solenoid valve. Refer to «SOLENOID, EVAPORATIVE EMISSIONS PURGE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) .
16. On 5.7L and 3.6L models, install the air cleaner housing, air intake tube and resonator, as equipped.
17. Install the engine trim cover, if equipped.
18. Reconnect the negative battery cable.
19. Evacuate the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
20. Adjust the refrigerant oil level. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
21. Charge the refrigerant system. Refer to «REFRIGERANT SYSTEM CHARGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__refrigerant-system-charge) .

REFRIGERANT OIL LEVEL

When an A/C system is assembled at the factory, all components except the A/C compressor are refrigerant oil free. After the refrigerant system has been charged and operated, the refrigerant oil in the A/C compressor is dispersed throughout the refrigerant system. The receiver/drier, A/C evaporator, A/C condenser and the A/C compressor will each retain a significant amount of the needed refrigerant oil.

It is important to have the correct amount of refrigerant oil in the A/C system. This ensures proper lubrication of the A/C compressor. Too little oil will result in damage to the A/C compressor, while too much oil will reduce the cooling capacity of the A/C system and consequently result in higher discharge air temperatures.

Note. Most reclaim/recycling equipment will measure the lubricant being removed during recovery. This amount of lubricant should be added back into the system. Refer to the reclaim/recycling equipment manufacturers instructions.

It will not be necessary to check the oil level in the A/C compressor or to add oil, unless there has been an oil loss. An oil loss may occur due to a rupture or leak from a refrigerant line, a connector fitting, a component, or a component seal. If a leak occurs, add 30 milliliters (1 fluid ounce) of refrigerant oil to the refrigerant system after the repair has been made. Refrigerant oil loss will be evident at the leak point by the presence of a wet, shiny surface around the leak.

Refrigerant oil must be added when an A/C condenser, A/C evaporator or A/C receiver/drier is replaced. See the Refrigerant Oil Capacities chart.

The refrigerant oil level in a new A/C compressor must first be adjusted prior to compressor installation. Refer to COMPRESSOR OIL DRAIN PROCEDURE .

REFRIGERANT OIL TYPE

*Always use the type of PAG oil listed for the model being serviced. See A/C Underhood Specification Label located in the engine compartment. Do not mix different types of PAG oils.

REFRIGERANT OIL CAPACITIES

COMPRESSOR OIL DRAIN PROCEDURE

The A/C compressor is filled with refrigerant oil from the factory. Use the following procedure to drain and measure refrigerant oil from the A/C compressor.

1. Drain all of the refrigerant oil from the old A/C compressor into a clean measured container.
2. Drain all of the refrigerant oil from the new A/C compressor into a clean measured container.
3. Refill the new A/C compressor with the same amount of refrigerant oil that was drained out of the old compressor. Use only clean refrigerant oil of the type specified for the A/C compressor in the vehicle.
4. Install the new A/C compressor onto the engine. Refer to «COMPRESSOR, A/C, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .

REFRIGERANT CHARGE CAPACITY

REFRIGERANT CHARGE CAPACITY

Scheme 119

The A/C expansion valve controls the amount of refrigerant entering the A/C evaporator and is of a thermostatic expansion valve (TXV) design. The A/C expansion valve consists of an aluminum H-valve type body (1) with an integral thermal sensor (2) and is located at the dash panel between the A/C refrigerant lines and the A/C evaporator.

The A/C expansion valve controls the high-pressure, low temperature liquid refrigerant from the A/C liquid line and converts it into a low-pressure, low-temperature mixture of liquid and gas before it enters the A/C evaporator. A mechanical sensor in the A/C expansion valve monitors the temperature and pressure of the refrigerant leaving the A/C evaporator through the A/C suction line, and adjusts the orifice size at the liquid line port to let the proper amount of refrigerant into the evaporator to meet the vehicle A/C cooling requirements. Controlling the refrigerant flow through the A/C evaporator ensures that none of the refrigerant leaving the A/C evaporator is still in a liquid state, which could damage the A/C compressor.

Note. Replacement of the refrigerant line O-ring seals is required anytime a refrigerant line is disconnected from the expansion valve. Failure to replace the rubber O-ring seals could result in a refrigerant system leak.

The A/C expansion valve is factory calibrated and cannot be adjusted or repaired and must be replaced if inoperative or damaged.

DIAGNOSIS AND TESTING - A/C EXPANSION VALVE

Note. The A/C expansion valve should only be tested following testing of the A/C compressor.

Note. Liquid CO 2 is required to test the A/C expansion valve. This material is available from most welding supply facilities. Liquid CO 2 is also available from companies which service and sell fire extinguishers.

When testing the A/C expansion valve, the work area and the vehicle temperature must be 21° to 27° C (70° to 85° F). To test the expansion valve

1. Connect a charging station or manifold gauge set to the refrigerant system service ports. Verify the refrigerant charge level.
2. Close all doors, windows and vents to the passenger compartment.
3. Set the A/C-heater controls so that the A/C compressor is operating, the temperature control is in the highest temperature position, the mode-air doors is directing air output to the floor and the blower motor operating is operating at the highest speed.
4. Start the engine and allow it to idle. After the engine has reached normal operating temperature, allow the passenger compartment to heat up. This will create the need for maximum refrigerant flow into the A/C evaporator.
5. If the refrigerant charge is sufficient, the discharge (high pressure) gauge should read 827 kPa to 1655 kPa (120 psi to 240 psi). The suction (low pressure) gauge should read 207 kPa to 345 kPa (30 psi to 50 psi). If OK, refer to 6 . If not OK, replace the inoperative A/C expansion valve. WARNING: Protect the skin and eyes from exposure to liquid CO 2 or personal injury can result.
6. If the suction (low pressure) gauge reads within the specified range, freeze the A/C expansion valve for 30 seconds using liquid CO 2 or another suitable super-cold material. Do not spray R-134a or R-12 refrigerant on the A/C expansion valve for this test. The suction (low pressure) gauge reading should drop by 69 kPa (10 psi). If OK, refer to 7 . If not OK, replace the inoperative A/C expansion valve.
7. Allow the expansion valve control head to thaw. The suction (low pressure) gauge reading should stabilize at 207 kPa to 345 kPa (30 psi to 50 psi). If not OK, replace the inoperative A/C expansion valve.
8. When the expansion valve testing is complete, test the overall A/C system performance. Refer to «DIAGNOSIS AND TESTING»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .

Note. LHD model with 5.7L engine shown in illustrations. RHD model and other engines similar.

Scheme 120

1. Disconnect and isolate the negative battery cable.
2. On 3.6Land 5.7L models, remove the air cleaner housing, air intake tube and resonator, as equipped.
3. Remove the engine trim cover, if equipped.
4. Recover the refrigerant from the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
5. Remove the evaporative emissions purge solenoid valve from the A/C liquid and suction line bracket located on the left front strut tower and position it out of the way. Refer to «SOLENOID, EVAPORATIVE EMISSIONS PURGE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) .
6. Remove the nut (2) that secures the front section of the A/C suction line (3) to the rear section of the A/C suction line (1).
7. Disconnect the A/C suction lines from each other and remove and discard the seal.
8. Remove the nut (2) that secures the front section of the A/C liquid line (3) to the rear section of the A/C liquid line (1).
9. Disconnect the A/C liquid lines from each other and remove and discard the seal.
10. Remove the windshield wiper arms and wiper module. Refer to «LINKAGE, WIPER ARM, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/wiperwasher-systems/#wiper-system-washer-system-service-information) .
11. Remove the cowl extension silencer. Refer to «SILENCER, COWL EXTENSION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
12. Remove the nut (2) that secures the A/C liquid and suction line assembly (1) to the stud (3) located on the left front strut tower.
13. Remove the bolt (4) that secures the A/C liquid and suction line assembly to the cowl panel bracket.
14. Remove the nut (6) that secures the A/C liquid and suction line assembly to the A/C expansion valve (5).
15. Disengage the A/C liquid and suction line assembly from the stud located on the strut tower.
16. Disconnect the A/C liquid and suction line assembly from the A/C expansion valve.
17. Remove the A/C liquid and suction line assembly from the engine compartment and remove and discard the seals.
18. Remove the two bolts (1) that secure the A/C expansion valve (2) to the evaporator tube tapping block.
19. Remove the A/C expansion valve from the evaporator tubes and remove and discard the seals.
20. Install plugs in, or tape over the opened refrigerant line fittings and evaporator ports.

Note. When replacing multiple A/C system components, see the Refrigerant Oil Capacities chart to determine how much oil should be added to the refrigerant system. Refer to OIL, REFRIGERANT, STANDARD PROCEDURE .

Note. Replacement of the refrigerant line seals is required anytime the A/C expansion valve is removed from the A/C evaporator. Failure to replace the rubber and metal seals may result in a refrigerant system leak.

Note. LHD model with 5.7L engine shown in illustrations. RHD model and other engines similar.

1. Remove the tape or plugs from all the opened refrigerant line fittings and evaporator ports.
2. Lubricate new seals with clean refrigerant oil and install them onto the evaporator tube and refrigerant line fittings. Use only the specified seals as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
3. Install the A/C expansion valve (2) onto the evaporator tubes.
4. Install the two bolts (1) that secure the A/C expansion valve to the evaporator tube tapping block. Tighten the bolts to 11 N.m (97 in. lbs.).
5. Position the A/C liquid and suction line assembly (1) into the engine compartment.
6. Remove the tape or plugs from the opened refrigerant line fittings and the expansion valve ports.
7. Lubricate new seals with clean refrigerant oil and install them onto the refrigerant line fittings. Use only the specified seals as they are made of a special material for the R-134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
8. Connect the A/C liquid and suction line assembly to the A/C expansion (5).
9. Engage the A/C liquid and suction line assembly to stud (3) located on the left front strut tower.
10. Install the nut (6) that secures the A/C liquid and suction line assembly to the A/C expansion valve. Tighten the nut to 20 N.m (15 ft. lbs.).
11. Install the bolt (4) that secures the A/C liquid and suction line assembly to the cowl panel bracket. Tighten the bolt securely.
12. Install the nut (2) that secures the A/C liquid and suction line assembly to the stud located on the strut tower. Tighten the nut securely.
13. Install the cowl extension silencer. Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
14. Install the windshield wiper module and arms. Refer to «LINKAGE, WIPER ARM, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/wiperwasher-systems/#wiper-system-washer-system-service-information) .
15. Connect the front section of the A/C liquid line (3) to the rear section of the A/C liquid line (1).
16. Install the nut (2) that secures the two sections of the A/C liquid line together. Tighten the nut to 20 N.m (15 ft. lbs.).
17. Connect the front section of the A/C suction line (3) to the rear section of the A/C suction line (1).
18. Install the nut (2) that secures the two sections of the A/C suction line together. Tighten the nut to 20 N.m (15 ft. lbs.).
19. Install the evaporative emissions purge solenoid valve. Refer to «SOLENOID, EVAPORATIVE EMISSIONS PURGE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) .
20. On 3.6L and 5.7L models, install the air cleaner housing, air intake tube and resonator, as equipped.
21. Install the engine trim cover, if equipped.
22. Reconnect the negative battery cable.
23. Evacuate the refrigerant system. Refer to «PLUMBING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
24. Adjust the refrigerant oil level. Refer to «OIL, REFRIGERANT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
25. Charge the refrigerant system. Refer to «REFRIGERANT SYSTEM CHARGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information__refrigerant-system-charge) .

Scheme 121

Note. LHD model shown in illustration. RHD model similar.

An Electric Positive Temperature Coefficient (PTC) heater unit (1) is used on vehicles when equipped with the 3.0L diesel engine. The PTC heater unit aids in passenger compartment heating by compensating for the lower engine coolant temperatures produced by the diesel engine. The PTC heater unit is mounted in the HVAC air distribution housing, downstream of the heater core and is controlled by the Powertrain Control Module (PCM) and the Totally Integrated Power Module (TIPM).

The PTC heater consists of a molded plastic mounting plate (2) with an integral wire connector receptacle (3). Concealed behind the mounting plate are four heating elements with fins (4) that transfer the heat produced by the PTC heater to the conditioned air flowing within the air distribution housing. A retaining feature (5) is molded onto the opposite end of the heater unit to support the heater unit inside the air distribution housing. The PTC heater unit is connected to the vehicle electrical system through the instrument panel wire harness and the PTC heater jumper harness.

The PTC heater unit is accessed for service by removing the instrument panel.

The Positive Temperature Coefficient (PTC) heater unit dissipates 1 kW of electrical power through 4 heating bars. The Powertrain Control Module (PCM) and the Totally Integrated Power Module (TIPM) operate three relays for the PTC heater unit. The PTC heater unit is split into three "banks". Each bank is driven separately based on alternator load. This allows for lower in-rush current and optimum battery charging. After a bank has been turned on, another bank can only be turned on 10 seconds after the previous. On average, the PTC banks are not switched more than 25 times for each vehicle start. Electrical power output is between 900-1050 W.

The control system for the PTC heater unit is diagnosed using a scan tool. Prior to replacing a PTC heater unit, check for any Diagnostic Trouble Codes (DTCs) related to the heating and A/C system, PCM and TIPM. Initiate the Actuator Calibration function to verify that the concern is not a heating and A/C system calibration issue. Refer to STANDARD PROCEDURE .

The PTC heater unit cannot be adjusted or repaired and must be replaced if inoperative or damaged.

POSITIVE TEMPERATURE COEFFICIENT (PTC) HEATER UNIT

Note. Refer to appropriate Wiring Information for circuit descriptions and diagrams. Wiring Information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

Prior to replacing the Positive Temperature Coefficient (PTC) heater unit, check for any Diagnostic Trouble Codes (DTCs) related to the heating and A/C system, Powertrain Control Module (PCM) and Totally Integrated Power Module (TIPM). Repair as necessary. Also, initiate the Actuator Calibration function to verify that the concern is not a heating and A/C system calibration issue. Refer to STANDARD PROCEDURE .

1. Disconnect and isolate the negative battery cable.
2. Disconnect the wire harness connector from the PTC heater unit. Refer to «UNIT, HEATER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
3. Using an ohmmeter, check for continuity between all of the PTC heater unit terminals. In each case there should be continuity. If OK, repair the wire harness circuits between the PTC heater unit and the PCM and the TIPM. If not OK, replace the PTC heater unit.

Scheme 122

Note. PTC heater shown in illustration removed from distribution housing for clarity.

Scheme 123

1. Disconnect and isolate the negative battery cable.
2. Remove the instrument panel. Refer to «PANEL, INSTRUMENT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) . NOTE: To disconnect the wire harness connector from the heater unit, pull upward on the connector lock while pulling the connector away from the heater unit.
3. Disengage the wire connector lock (1) and disconnect the wire harness connector (2) from the positive temperature coefficient (PTC) heater unit (3). NOTE: LHD model shown in illustration. RHD model similar.
4. Remove the two screws (1) that secure the PTC heater unit (2) to the driver side of the HVAC air distribution housing (3).
5. Carefully remove the PTC heater unit from the air distribution housing by pulling it straight out of the housing.

Note. LHD model shown in illustration. RHD model similar.

Scheme 124

1. Carefully install the positive temperature coefficient (PTC) heater unit (2) into the driver side of the HVAC air distribution housing (3). Make sure to engage the top end of the heater unit to the plastic molded pin located inside of the air distribution housing, on the passenger side of the housing.
2. Install the two screws (1) that secure the PTC heater unit to the air distribution housing. Tighten the screws to 2 N.m (17 in. lbs.). NOTE: PTC heater shown in illustration removed from distribution housing for clarity.
3. Connect the wire harness connector (1) to the PTC heater unit (2) while pulling downward on the connector lock (3). Make sure the wire harness connector and lock are fully engaged.
4. Install the instrument panel. Refer to «PANEL, INSTRUMENT, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
5. Reconnect the negative battery cable.

See also:
• ENGINE COOLING SYSTEM
• STANDARD PROCEDURE
• COVER, COWL PANEL
• WARNING
• OPERATION
• OPERATION
• MODULE, PASSIVE ENTRY, REMOVAL
• RADIO, REMOVAL
• LINKAGE, WIPER ARM, REMOVAL
• REVERSE FLUSHING
• BATTERY, AGM, DIAGNOSIS AND TESTING
• BELT, SERPENTINE, REMOVAL
• BODY, AIR CLEANER, REMOVAL
• BELT, SERPENTINE, INSTALLATION
• COOLER, POWER STEERING, REMOVAL
• SOLENOID, EVAPORATIVE EMISSIONS PURGE, REMOVAL
• UNIT, HEATER, DESCRIPTION
• PLUMBING, WARNING
• PLUMBING, CAUTION
• DIAGNOSIS AND TESTING - REFRIGERANT SYSTEM LEAKS
• A/C CLUTCH COIL
• REFRIGERANT OIL LEVEL
• DIAGNOSIS AND TESTING - A/C EXPANSION VALVE
• REFRIGERANT SYSTEM CHARGE
• SYSTEM EMPTY
• SYSTEM LOW
• LEAK TEST
• COIL RESISTANCE TEST
• COIL CURRENT DRAW TEST
• COMPRESSOR OIL DRAIN PROCEDURE