Home ReviewsRefund
Home/Cadillac/SRX/Cadillac SRX II (2009-2012)/Repair manual/Automatic HVAC System/Heating, Ventilation, and Air Conditioning
Contents Wiring diagrams Section: Automatic HVAC System All sections

Heating, Ventilation, and Air Conditioning Cadillac SRX II

Automatic HVAC System 53 illustrations ~5173 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
A/C Compressor Mounting Bolt58 N.m43 lb ft
A/C Compressor Mounting Nut22 N.m12 lb ft
A/C Line to Shock Tower Bracket Nut9 N.m80 lb in
Air Distribution Duct Screws2 N.m18 lb in
Air Inlet Housing Fasteners2.5 N.m23 lb in
Air Outlet Duct Screws2 N.m17 lb in
Blower Motor Mounting Screws1.5 N.m13 lb in
Compressor Pressure Relief Valve8 N.m70 lb in
Condenser Mounting Bolts9 N.m80 lb in
Discharge Hose at Compressor Bolt9 N.m80 lb in
Heater and A/C Evaporator and Blower Module Fastener1.4 N.m12 lb in
Heater Core Inlet/Outlet Tube Bolt2.5 N.m23 lb in
Heater Hose Bracket Nuts9 N.m80 lb in
HVAC Module Mounting Bolts9 N.m80 lb in
HVAC Module Mounting Nuts9 N.m80 lb in
HVAC Module Screws1 N.m9 lb in
Instrument Panel Outer Air Outlet Fastener2.5 N.m22 lb in
Liquid Line at Condenser9 N.m80 lb in
Receiver Dehydrator Bolt and Bracket Bolt6 N.m53 lb in
Refrigerant Pressure Sensor5 N.m44 lb in
Suction Hose at Compressor Bolt9 N.m80 lb in
Suction Line Bracket Screw2 N.m18 lb in
Surge Tank Outlet Hose Bracket Nuts9 N.m80 lb in
TXV Bolts6 N.m53 lb in
TXV Stud6 N.m53 lb in

Refrigerant System Specifications

ApplicationSpecification
MetricEnglish
Abrupt Refrigerant Loss60 ml 12.0 oz. 1
PAG Oil GM P/N 12378526 for United States PAG Oil GM P/N 88900060 for Canada
Compressor Replacement
NOTE: Compressor failure can occur if the oil removed during refrigerant recovery is not replaced. The service compressor is shipped with 74 ml 2 (2.5 oz. 2 ) of PAG oil.
Condenser Replacement30 ml 21.0 oz. 2
Evaporator Replacement90 ml 23.0 oz. 2
Any Line Set (Hose/Tube or Tube Assembly) Replacement30 ml 21.0 oz. 2
Total System PAG Oil Capacity110.0 ml3.7 oz.
R-134a
Refrigerant Charge0.73 kg1.61 lb
1 Abrupt refrigerant loss due to large leak, hose rupture, collision, or pressure relief valve opening. Conditions that allow the refrigerant to seep or bleed off over time do not cause this oil loss. Upon replacement of a component that caused a large refrigerant loss, also add the required amount of oil for the particular component. 2 If more than the specified amount of PAG oil was drained from a component, add the amount drained.
NOTE
Compressor failure can occur if the oil removed during refrigerant recovery is not replaced.

Refrigerant System Capacities

Handling of Refrigerant Lines and Fittings

CAUTIONTo avoid system damage use only R-134a dedicated tools when servicing the A/C system.
  1. Keep all metal tubing lines free of dents or kinks. Any line restrictions will cause the loss of system capacity.
  2. Never bend a flexible hose line to a radius of less than four times the diameter of the hose.
  3. Never allow a flexible hose line to come within 65 mm (2-1/2 in) of the exhaust manifold.
  4. Inspect flexible hose lines regularly for leaks or brittleness.
  5. Replace flexible hose lines with new lines if you find signs of deterioration or leaking.
  6. Discharge the refrigeration system of all refrigerant before disconnecting any fitting in the refrigeration system.
  7. Proceed very cautiously regardless of the gauge readings.
  8. Open the fittings very slowly.
  9. If you notice pressure when you loosen a fitting, allow the pressure to bleed off as described Discharging, Adding Oil, Evacuating, and Charging Procedures for A/C System.
  10. Cap or tape any refrigerant line immediately after it is opened. This will prevent the entrance of moisture and dirt, which can cause internal compressor wear or plugged lines in the condenser, the evaporator core, the expansion valve, or the compressor inlet screens. NOTE: Use two proper wrenches to connect the fittings.
  11. Back up the opposing fitting to prevent distortion of the connecting lines or the components.
  12. Keep the sealing surfaces in perfect condition. A burr or a piece of dirt may cause a refrigerant leak.
  13. When seal washers are used, always install the seal washer without lubrication.
  14. When O-rings are used, always lightly coat the new O-ring seal with mineral base 525 viscosity refrigerant oil prior to installation.

Special Tools

  1. J 39400-A: Halogen Leak Detector
  2. J 41447: R-134A A/C Tracer Dye-Box of 24
  3. J 42220: Universal 12V Leak Detection Lamp
  4. J 43872: Fluorescent Dye Cleaner
  5. J 46297: A/C Dye Injector Kit
  6. J 46297-12: Replacement Dye Cartridges

Refrigerant Leak Testing

Note. General Motors vehicles are now manufactured with fluorescent dye installed directly into the air conditioning (A/C) system.

The fluorescent dye mixes and flows with the polyalkylene glycol (PAG) oil throughout the refrigerant system.

Verifying some passive leaks may require using the J 39400-A: Halogen Leak Detector, even though the A/C system contains fluorescent dye.

The only time that adding additional fluorescent dye is required is after flushing the A/C system.

Fluorescent Leak Detector

Fluorescent dye will assist in locating any leaks in the A/C system.

  1. Condensation on the evaporator core or the refrigerant lines may wash the PAG oil and fluorescent dye away from the actual leak. Condensation may also carry dye through the HVAC module drain.
  2. Leaks in the A/C system will be indicated in a light green or yellow color when using the leak detection lamp. Use the leak detection lamp in the following areas: All fittings or connections that use seal washers or O-rings All of the A/C components The A/C compressor shaft seal The A/C hoses and pressure switches The HVAC module drain tube, if the evaporator core is suspected of leaking The service port sealing caps The sealing cap is the primary seal for the service ports.
  3. Follow the instructions supplied with the J 42220: Universal 12V Leak Detection Lamp.
  4. To prevent false diagnosis in the future, thoroughly clean the residual dye from any area where leaks were found. Use a rag and the approved J 43872: Fluorescent Dye Cleaner.

Fluorescent Dye Injection

  1. Not all of the fluorescent dyes are compatible with PAG oil. Some types of dye decrease the oil viscosity or may chemically react with the oil.
  2. R-134A leak detection dye requires time to work. Depending upon the leak rate, a leak may not become visible for between 15 minutes and 7 days.
  3. To prevent false diagnosis, thoroughly clean any residual dye from the service port with a rag and the approved fluorescent dye cleaner J 43872: Fluorescent Dye Cleaner.

Halogen Leak Detector

WARNINGDo not operate the detector in a combustible atmosphere since its sensor operates at high temperatures or personal injury and/or damage to the equipment may result.

Ensure that the vehicle has at least 0.45 kg (1 lb) of refrigerant in the A/C refrigeration system in order to perform a leak test. Refer to Refrigerant Recovery and Recharging for recharging the A/C system.

Note. Halogen leak detectors are sensitive to the following items: Windshield washing solutions Many solvents and cleaners Some adhesives used in the vehicle

Clean and dry all surfaces in order to prevent a false warning. Liquids will damage the detector.

Note. Follow a continuous path in order to ensure that you will not miss any possible leaks. Test all areas of the system for leaks.

Follow the instructions supplied with the J 39400-A: Halogen Leak Detector.

Test Description

This test measures the operating efficiency of the A/C system under the following conditions

  1. The current ambient air temperature
  2. The current relative humidity
  3. The high side pressure of the A/C system
  4. The low side pressure of the A/C system
  5. The temperature of the air being discharged into the passenger compartment

The numbers below refer to the step numbers on the diagnostic table.

  1. 1: This step determines if the A/C system has at least the minimum refrigerant charge required to operate the system without damage.
  2. 2: This step measures the performance of the A/C system.
  3. 3: This step is to allow for vehicle variations as well as high ambient temperatures.
StepActionValuesYesNo
IMPORTANT: The ambient air temperature must be at least 16°C (60°F). Do not induce additional air flow across the front of the vehicle during the test. If you were sent here from a DTC diagnostic table, clear the DTC upon completion of this test.
1Park the vehicle inside or in the shade. Open the windows in order to ventilate the interior of the vehicle. If the A/C system was operating, allow the A/C system to equalize for about 5 minutes. Turn OFF the ignition. Install the J 43600 ACR 2000 Air Conditioning Service Center. See Special Tools . Record the ambient air temperature displayed on the J 43600 . See Special Tools . Record the low and high side STATIC pressure readings. Are both the low side and high side pressures above the specified value?More than 16°C (60°F) - 345 kPa (50 psi) More than 24°C (75°F) - 483 kPa (70 psi) More than 33°C (90°F) - 690 kPa (100 psi)Go to Step 2Go to Leak Testing
2IMPORTANT: Record the relative humidity and the ambient air temperature at the time of the test. Close the vehicle doors and windows. Open the driver door window 12.7-15.2 cm (5-6 in). Select the following HVAC control settings: The A/C is ON. The maximum blower speed The maximum blower speed selected on the auxiliary blower controls Recirculation mode The Face mode The coldest temperature setting Passenger setting is OFF All A/C outlets are OPEN Install the temperature probes of the J 43600 in the left and right center A/C air outlets. See Special Tools . Apply the parking brake. Place the transaxle/transmission in the following position: PARK. Start the engine. Operate the A/C system for 5 minutes. Inspect A/C components for the following conditions: Abnormal frost areas Unusual noises IMPORTANT: Make sure that the compressor is engaged when taking the data. Press the RESET button, before using the print function of the J 43600 . See Special Tools . Print the following information: The outlet air temperatures The low-side pressure The high-side pressure Compare the low and high side pressures and the output temperatures to the A/C Performance Table. Does all the data recorded fall within the specified ranges of the A/C Performance Table?Go to Step 8Go to Step 3
3If the pressures and temperatures recorded do not fall within the specified ranges of the A/C Performance Table: Continue to operate the A/C system for an additional 5 minutes. RESET the J 43600 and record the pressures and temperatures again. See Special Tools . Compare the low and high side pressures and the output temperature to the A/C Performance Table. Does all the data recorded fall within the specified ranges?Go to Step 8Go to Step 4
4Do the high and low side pressures fall within the specified ranges, but the outlet temperatures do not?Go to Air Conditioning (A/C) Diagnostics - Pressure Zone AGo to Step 5
5Is the low side pressure greater than the specified range, but the high side pressure within or less than the specified range?Go to Air Conditioning (A/C) Diagnostics - Pressure Zone BGo to Step 6
6Are the low and high side pressures both greater than the specified ranges?Go to Air Conditioning (A/C) Diagnostics - Pressure Zone CGo to Step 7
7Is the high side pressure greater than or within the specified range, but the low side pressure is less than the specified range?Go to Air Conditioning (A/C) Diagnostics - Pressure Zone DGo to Step 8
8Operate the system in order to verify the test results. Did you find the same results?System OKGo to Symptoms - HVAC Systems - Automatic
IMPORTANT
The ambient air temperature must be at least 16°C (60°F). Do not induce additional air flow across the front of the vehicle during the test. If you were sent here from a DTC diagnostic table, clear the DTC upon completion of this test.
IMPORTANT
Record the relative humidity and the ambient air temperature at the time of the test.
IMPORTANT
Make sure that the compressor is engaged when taking the data. Press the RESET button, before using the print function of the J 43600 . See Special Tools .
Ambient TemperatureRelative HumidityLow Side Service Port PressureHigh Side Service Port PressureMaximum Left Center Discharge Air Temperature
13-18°C (55-65°F)0-100%151-213 kPa (22-31 psi)427-902 kPa (62-131 psi)7°C (43°F)
19-24°C (66-75°F)Less than 40%151-241 kPa (22-35 psi)558-1047 kPa (81-152 psi)8°C (46°F)
Greater than 40%165-261 kPa (24-38 psi)668-1129 kPa (97-164 psi)9°C (48°F)
25-29°C (76-85°F)Less than 35%186-261 kPa (27-38 psi)923-1288 kPa (134-187 psi)10°C (50°F)
35-50%192-275 kPa (28-40 psi)957-1302 kPa (139-189 psi)12°C (52°F)
Greater than 50%206-289 kPa (30-42 psi)992-1322 kPa (144-192 psi)13°C (54°F)
30-35°C (86-95°F)Less than 30%213-296 kPa (31-43 psi)1191-1598 kPa (173-232 psi)13°C (55°F)
30-50%220-310 kPa (32-45 psi)1212-1577 kPa (176-229 psi)14°C (63°F)
Greater than 50%234-323 kPa (34-47 psi)1219-1557 kPa (177-226 psi)15°C (66°F)
36-41°C (96-105°F)Less than 20%248-323 kPa (36-47 psi)1529-1929 kPa (222-280 psi)17°C (61°F)
20-40%248-337 kPa (36-49 psi)1522-1880 kPa (221-273 psi)18°C (63°F)
Greater than 40%261-344 kPa (38-50 psi)1508-1839 kPa (219-267 psi)18°C (64°F)
42-46°C (106-115°F)Less than 20%282-358 kPa (41-52 psi)1867-2197 kPa (271-319 psi)19°C (70°F)
Greater than 20%289-365 kPa (42-53 psi)1853-2129 kPa (269-309 psi)20°C (68°F)
47-49°C (116-120°F)Below 30%316-385 kPa (46-56 psi)2122-2418 kPa (308-251 psi)20°C (72°F)

A/C Performance Table

Scheme 1

Scheme 1: A/C System Pressure - Zone Classification
Scheme 1: A/C System Pressure - Zone Classification

This test measures the operating efficiency of the A/C system under the following conditions

  1. The current ambient air temperature
  2. The current relative humidity
  3. The high side pressure of the A/C system
  4. The low side pressure of the A/C system
  5. The temperature of the air being discharged into the passenger compartment

The numbers below refer to the step numbers on the diagnostic table.

  1. 1: This step determines if the A/C system has at least the minimum refrigerant charge required to operate the system without damage.
  2. 2: This step measures the performance of the A/C system.
  3. 3: This step is to allow for vehicle variations as well as high ambient temperatures.
StepActionValuesYesNo
IMPORTANT: The ambient air temperature must be at least 16°C (60°F). Do not induce additional air flow across the front of the vehicle during the test. If you were sent here from a DTC diagnostic table, clear the DTC upon completion of this test.
1Park the vehicle inside or in the shade. Open the windows in order to ventilate the interior of the vehicle. If the A/C system was operating, allow the A/C system to equalize for about 5 minutes. Turn OFF the ignition. Install the J 43600 ACR 2000 Air Conditioning Service Center. See Special Tools . Record the ambient air temperature displayed on the J 43600 . See Special Tools . Record the low and high side STATIC pressure readings. Are both the low side and high side pressures above the specified value?More than 16°C (60°F) - 345 kPa (50 psi) More than 24°C (75°F) - 483 kPa (70 psi) More than 33°C (90°F) - 690 kPa (100 psi)Go to Step 2Go to Leak Testing
2IMPORTANT: Record the relative humidity and the ambient air temperature at the time of the test. Close the vehicle doors and windows. Open the driver door window 12.7-15.2 cm (5-6 in). Select the following HVAC control settings: The A/C is ON. The maximum blower speed The maximum blower speed selected on the auxiliary blower controls Recirculation mode The Face mode The coldest temperature setting Passenger setting is OFF All A/C outlets are OPEN Install the temperature probes of the J 43600 in the left and right center A/C air outlets. See Special Tools . Apply the parking brake. Place the transaxle/transmission in the following position: PARK. Start the engine. Operate the A/C system for 5 minutes. Inspect A/C components for the following conditions: Abnormal frost areas Unusual noises IMPORTANT: Make sure that the compressor is engaged when taking the data. Press the RESET button, before using the print function of the J 43600 . See Special Tools . Print the following information: The outlet air temperatures The low-side pressure The high-side pressure Compare the low and high side pressures and the output temperatures to the A/C Performance Table. Does all the data recorded fall within the specified ranges of the A/C Performance Table?Go to Step 8Go to Step 3
3If the pressures and temperatures recorded do not fall within the specified ranges of the A/C Performance Table: Continue to operate the A/C system for an additional 5 minutes. RESET the J 43600 and record the pressures and temperatures again. See Special Tools . Compare the low and high side pressures and the output temperature to the A/C Performance Table. Does all the data recorded fall within the specified ranges?Go to Step 8Go to Step 4
4Do the high and low side pressures fall within the specified ranges, but the outlet temperatures do not?Go to Air Conditioning (A/C) Diagnostics - Pressure Zone AGo to Step 5
5Is the low side pressure greater than the specified range, but the high side pressure within or less than the specified range?Go to Air Conditioning (A/C) Diagnostics - Pressure Zone BGo to Step 6
6Are the low and high side pressures both greater than the specified ranges?Go to Air Conditioning (A/C) Diagnostics - Pressure Zone CGo to Step 7
7Is the high side pressure greater than or within the specified range, but the low side pressure is less than the specified range?Go to Air Conditioning (A/C) Diagnostics - Pressure Zone DGo to Step 8
8Operate the system in order to verify the test results. Did you find the same results?System OKGo to Symptoms - HVAC Systems - Automatic
IMPORTANT
The ambient air temperature must be at least 16°C (60°F). Do not induce additional air flow across the front of the vehicle during the test. If you were sent here from a DTC diagnostic table, clear the DTC upon completion of this test.
IMPORTANT
Record the relative humidity and the ambient air temperature at the time of the test.
IMPORTANT
Make sure that the compressor is engaged when taking the data. Press the RESET button, before using the print function of the J 43600 . See Special Tools .
Ambient TemperatureRelative HumidityLow Side Service Port PressureHigh Side Service Port PressureMaximum Left Center Discharge Air Temperature
13-18°C (55-65°F)0-100%165-213 kPa (24-31 psi)999-1350 kPa (145-196 psi)7°C (43°F)
19-24°C (66-75°F)Less than 40%179-241 kPa (26-35 psi)1061-1412 kPa (154-205 psi)8°C (46°F)
Greater than 40%179-254 kPa (26-37 psi)1150-1502 kPa (167-218 psi)9°C (48°F)
25-29°C (76-85°F)Less than 35%192-254 kPa (28-37 psi)1267-1550 kPa (184-225 psi)9°C (48°F)
35-50%199-261 kPa (29-38 psi)1322-1570 kPa (139-189 psi)10°C (50°F)
Greater than 50%206-275 kPa (30-40 psi)1350-1632 kPa (196-237 psi)12°C (52°F)
30-35°C (86-95°F)Less than 30%206-268 kPa (30-39 psi)1433-1729 kPa (208-251 psi)12°C (52°F)
30-50%213-282 kPa (31-41 psi)1460-1750 kPa (212-254 psi)13°C (55°F)
Greater than 50%220-303 kPa (32-44 psi)1488-1777 kPa (216-258 psi)14°C (57°F)
36-41°C (96-105°F)Less than 20%213-275 kPa (31-40 psi)1632-1908 kPa (237-277 psi)13°C (55°F)
20-40%220-296 kPa (32-43 psi)1639-1922 kPa (238-279 psi)14°C (57°F)
Greater than 40%234-310 kPa (34-45 psi)1660-1922 kPa (241-279 psi)15°C (59°F)
42-46°C (106-115°F)Less than 20%227-289 kPa (33-42 psi)1832-2067 kPa (266-300 psi)14°C (57°F)
Greater than 20%241-310 kPa (35-45 psi)1832-2067 kPa (266-300 psi)15°C (59°F)
47-49°C (116-120°F)Below 30%241-310 kPa (36-46 psi)1991-2232 kPa (308-251 psi)17°C (61°F)

A/C Performance Table

Scheme 2

Scheme 2: A/C System Pressure - Zone Classification
Scheme 2: A/C System Pressure - Zone Classification

Air Conditioning (A/C) Diagnostics - Pressure Zone A

StepActionYesNo
DEFINITION: The high and low side pressures may be normal or slightly less than normal. Air Delivery Concern Slight Refrigerant Under Charge Refrigerant Contamination
1Were you sent here from the A/C System Performance Test?Go to Step 2Go to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU)
2Did the customer mention that the A/C system output temperatures are good at first, but then turn warm during extended drives?Go to Step 3Go to Step 4
3Increase engine speed to 1,500 RPM. During extended operation of the A/C system, does the low side pressure decrease?Go to Air Conditioning (A/C) Diagnostics - Pressure Zone DGo to Step 4
4Refer to the pressures recorded during the A/C system performance test. WARNING: Refer to Moving Parts and Hot Surfaces Warning . Inspect for the following conditions: The high side pressure is slightly greater than the specified pressure ranges in the A/C System performance Table but still near Zone A on the A/C Pressure-Zone Classification Chart. Refer to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU) . The discharge line is hot. The suction line is cool. Do the listed conditions exist?Go to Step 7Go to Step 5
5Refer to the pressures recorded during the A/C system performance test. Inspect for the following conditions: The low side pressure is slightly lower than the specified pressure ranges but still near Zone A on the A/C Pressure-Zone Classification Chart. Refer to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU) . The discharge line is warm-to-hot. The suction line is cool-to-warm. Do the listed conditions exist?Go to Step 6Go to Air Temperature Malfunction
6The A/C system may be undercharged. Leak test the A/C system. Refer to Leak Testing . Evacuate and Recharge the A/C system to specifications. Refer to Refrigerant Recovery and Recharging . Is the repair complete?Go to Step 11
7The A/C system may be contaminated. View the J 43600 ACR 2000 Air Conditioning Service Center information screen for detection of foreign gases in the A/C system. See Special Tools . Do foreign gases exist?Go to Step 8Go to Step 9
8Evacuate the A/C system to a scavenging tank. Refer to Refrigerant Recovery and Recharging . Recharge the A/C system to specifications. Is the repair complete?Go to Step 11
9The A/C system may contain too much moisture or air. Evacuate and recharge the A/C system to specifications. Refer to Refrigerant Recovery and Recharging . Operate the A/C system and inspect the panel outlet air temperatures. Refer to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU) . Are the panel outlet temperatures within the specified ranges of the A/C Performance Test Table?Go to Step 11Go to Step 10
10Record the low and high side pressures and the I/P panel outlet air temperature. Compare the panel outlet temperatures and pressure to those listed in the A/C System Performance Chart. Refer to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU) . Are the high and low side pressures and I/P panel outlet temperatures within specifications?Go to Step 11Go to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU)
11Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Symptoms - HVAC Systems - Automatic .

Air Conditioning (A/C) Diagnostics - Pressure Zone B

StepActionValueYesNo
DEFINITION: The low side pressure is higher than normal and the high side pressure is lower than normal. Malfunctioning A/C Compressor Refrigerant Under Charge
1Were you sent here from the A/C System Performance Test?Go to Step 2Go to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU)
2Refer to the pressures recorded during the A/C System Performance Test. Inspect for the following conditions: WARNING: Refer to Moving Parts and Hot Surfaces Warning . The low side pressure is greater than the specified pressure range of the A/C Performance Table. Refer to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU) . The high side pressure is less than the specified pressure range of the A/C Performance Table. Refer to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU) . The low side refrigerant line at the compressor feels cool-to-cold. The high side refrigerant line at the compressor feels warm-to-hot. Do the listed conditions exist?Go to Step 3Go to Step 7
3The A/C system may be undercharged or have compressor or expansion valve problems. Leak test the A/C system. Refer to Leak Testing . Note any potential leaks for later repair. Recover the refrigerant charge from the vehicle. Refer to Refrigerant Recovery and Recharging . Record the weight of the recovered refrigerant. Is the recovered amount below the specified values?Standard AC 0.57 kg (1.26 lbs) Rear AC (C57) 0.80 kg (1.76 lbs)Go to Step 4Go to Step 6
4The system is low on refrigerant charge. Repair any leaks noted in step 3 above. Evacuate and Recharge the A/C system to specifications. Refer to Refrigerant Recovery and Recharging . Is the repair complete?Go to Step 5
5Record the low and the high side pressures and the I/P panel outlet temperatures. Refer to step 2 of the Air Conditioning (A/C) System Performance Test. Compare the panel outlet temperatures and pressures to those listed in the A/C System Performance Chart. Are the high and low side pressures and I/P panel outlet temperatures within specification?System OKGo to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU)
6The thermal expansion valve needs to be replaced. Replace the thermal expansion valve. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement . Repair any leaks noted in step 3 above. Evacuate and recharge the A/C system to specifications. Refer to Refrigerant Recovery and Recharging . Is the repair complete?Go to Step 5
7Refer to the pressures recorded during the A/C System Performance Test. Inspect for the following conditions: WARNING: Refer to Moving Parts and Hot Surfaces Warning . The low side pressure is greater than the specified pressure range of the A/C Performance Table. Refer to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU) . The high side pressure is less than the specified pressure range of the A/C Performance Table. Refer to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU) . The low side refrigerant line at the compressor feels warm. The high side refrigerant line at the compressor feels warm to hot. Do the listed conditions exist?Go to Step 8Go to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU)
8The system could be low charged or there could be a problem with the A/C compressor. Verify that the compressor is engaging properly. Verify that the A/C system performance data was taken with the compressor clutch engaged for more than 10 seconds. Raise the engine RPM to 1,200. Record the low and high side pressures and the I/P panel outlet temperatures. Refer to step 2 of the Air Conditioning (A/C) System Performance Test. Compare the panel outlet temperatures and pressures to those listed in the A/C System Performance Chart. Are the high and low side pressures and I/P panel outlet temperatures within specification?Go to Step 3Go to Step 9
9With the engine speed raised to over 2,000 RPM and the A/C compressor clutch engaged, listen for any unusual compressor noises. Any unusual noises heard?Go to Step 3Go to Step 10
10Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement (LF1) or Air Conditioning Compressor Replacement (LAU) . Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging . Is the repair complete?Go to Step 11
11Operate the system in order to verify the repair. Did you find and correct the condition?System OKGo to Symptoms - HVAC Systems - Automatic .

Air Conditioning (A/C) Diagnostics - Pressure Zone C

StepActionYesNo
DEFINITION: The low and the high side pressures are both higher than normal. Restricted Condenser Air Flow Cooling Fan Malfunction Expansion Device Malfunction
1Were you sent here from the A/C System Performance Test?Go to Step 2Go to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU)
2Start the engine. Make sure that the A/C is ON. Inspect for proper cooling fan operation. Refer to Cooling Fan Description and Operation (LAU) or Cooling Fan Description and Operation (LF1) . Are the cooling fans ON and operating properly?Go to Step 3Go to Step 5
3Visually inspect for the following conditions: Damaged condenser cooling fins Missing or misaligned air baffles Restricted front end air flow Do any of these conditions exist?Go to Step 4Go to Step 6
4Repair the air flow restriction. Is the repair complete?Go to Step 7
5Repair the fault to the cooling fan operation. Refer to Cooling Fan Description and Operation (LAU) or Cooling Fan Description and Operation (LF1) . Is the repair complete?Go to Step 7
6Air is in the refrigerant system, or the system is overcharged. Refer to the view screen on J 43600 ACR 2000 Air Conditioning Service Center for foreign gas content in the refrigerant. See Special Tools . Recover and recharge the A/C system. Refer to Refrigerant Recovery and Recharging . Is the repair complete?Go to Step 7
7Record the low and high side pressures and the I/P panel outlet air temperature after you have performed the repairs. Compare the pressures and the panel outlet temperature to those listed in the A/C Performance Chart. Refer to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU) . Are the readings within the specified ranges listed in the A/C Performance table?Go to Step 8Go to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU)
8Operate the system in order to verify the repair. Did you find and correct the condition?System OKGo to Symptoms - HVAC Systems - Automatic

Air Conditioning (A/C) Diagnostics - Pressure Zone D

StepActionValueYesNo
DEFINITION: The low side pressure is lower than normal and the high side pressure is higher than normal. A restriction in the A/C system Debris in the system
1Were you sent here from the A/C System Performance Test?Go to Step 2Go to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU)
2WARNING: Refer to Moving Parts and Hot Surfaces Warning . Feel the liquid line at the front of dash.Is the liquid line cold at the front of dash?Go to Step 3Go to Step 8
3Feel along the surfaces of the following low side components: The compressor discharge hose The Condenser The liquid line between the condenser and the expansion device Did you detect an abrupt drop in temperature along the surfaces of any of the listed components?Go to Step 7Go to Step 4
4Feel the liquid line at the expansion device location for extreme cold, possibly accompanied by heavy frost. Feel along the liquid line beyond the expansion device location for warm temperature. Is the liquid line extremely cold at the expansion device location and warm beyond the expansion device location?Go to Step 11Go to Step 5
5Feel along the surfaces of the following low side components: The evaporator inlet tube between the expansion device and the evaporator core The evaporator outlet tube between the evaporator core and the compressor suction hose The compressor suction hose Did you feel an abrupt temperature change along the surfaces of the listed components?Go to Step 7Go to Step 6
6Feel along the surfaces of the low and the high side components: The evaporator inlet tube between the expansion device and the evaporator core The evaporator outlet tube and the compressor The compressor suction hose The compressor discharge hose The condenser The evaporator inlet tube between the condenser and the expansion device Are the temperatures of these components only mildly warm?Go to Step 14Go to Step 8
7Recover the refrigerant. Refer to Refrigerant Recovery and Recharging . Remove the restriction from the component, or replace the component which produced an abrupt temperature drop. Is the repair complete?Go to Step 9
8Recover the refrigerant and evacuate the system. Refer to Refrigerant Recovery and Recharging . Record the weight of the recovered refrigerant. Compare the weight of the recovered refrigerant with the system capacity. Refer to Refrigerant System Specifications . Is the weight of the recovered refrigerant charge greater than 75 percent of the total system capacity?Go to Step 9Go to Step 10
9Recharge the A/C system. Refer to Refrigerant Recovery and Recharging . Is the cooling performance improved?Go to Step 21Go to Step 10
10Leak test the system. Refer to Leak Testing . Repair any leaks found. Are the repairs complete?Go to Step 21
11The expansion device is restricted. Replace the expansion device. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement . If the expansion device was restricted, note the type of debris present. Are metal flakes present?Go to Step 12Go to Step 13
12Remove the compressor hose from the vehicle. Refer to Air Conditioning Condenser and Evaporator Hose Replacement (LF1) or Air Conditioning Condenser and Evaporator Hose Replacement (LAU) . Inspect the hose for debris by blowing shop air through one end of the hose while covering the other end with a shop towel. Observe the amount of debris collected in the shop towel. Did a large amount of debris collect in the shop towel?Go to Step 18Go to Step 20
13If the expansion device was restricted with a brown or black residue, perform the following procedure: Flush the A/C system. Refer to Flushing . Replace the desiccant bag. Refer to Receiver and Dehydrator Replacement . Are the repairs complete?Go to Step 21
14Recover the refrigerant. Refer to Refrigerant Recovery and Recharging . Disconnect the compressor hoses from the compressor. Refer to Air Conditioning Condenser and Evaporator Hose Replacement (LF1) or Air Conditioning Condenser and Evaporator Hose Replacement (LAU) . Is debris present in the compressor suction port?Go to Step 15Go to Step 19
15Remove the debris from the suction port. Inspect the expansion device for damage or debris. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement . Did you find evidence of damage or debris?Go to Step 17Go to Step 16
16If the expansion device does not show any signs of damage or debris, perform the following procedure: Remove the compressor hose from the vehicle. Refer to Air Conditioning Condenser and Evaporator Hose Replacement (LF1) or Air Conditioning Condenser and Evaporator Hose Replacement (LAU) . Inspect the hose for debris by blowing shop air through one end of the hose while covering the other end with a shop towel. Observe the amount of debris collected in the shop towel. Did a large amount of debris collect in the shop towel?Go to Step 18Go to Step 19
17Replace the expansion device. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement . If the expansion device was restricted, observe the type of debris present. Are metal flakes present?Go to Step 12Go to Step 13
18If a large amount of debris was collected in the shop towel from the suction hose, replace the desiccant bag. Refer to Receiver and Dehydrator Replacement . Is the repair complete?Go to Step 19
19Install the compressor hoses. Refer to Air Conditioning Condenser and Evaporator Hose Replacement (LF1) or Air Conditioning Condenser and Evaporator Hose Replacement (LAU) . Are the repairs complete?Go to Step 21
20Install the compressor hose. Refer to Air Conditioning Condenser and Evaporator Hose Replacement (LF1) or Air Conditioning Condenser and Evaporator Hose Replacement (LAU) . Recharge the A/C system. Refer to Refrigerant Recovery and Recharging . Are the repairs complete?Go to Step 21
21Record the low and the high side pressures and the panel outlet air temperature after you perform the repairs. Compare the pressures and the panel outlet temperature to those listed in the A/C Performance Chart. Refer to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU) . Are the readings within the specified ranges as shown on the A/C Performance Chart?Go to Step 22Go to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU)
22Operate the system in order to verify the repair. Did you find and correct the condition?System OKGo to Symptoms - HVAC Systems - Automatic

Heating Performance Diagnostic

StepActionYesNo
DEFINITION: Heating system performance.
1Were you sent here from Symptoms or another diagnostic table?Go to Step 2Go to Symptoms - HVAC Systems - Automatic
2Start the engine. Allow the engine to idle. Does the engine reach a normal operating temperature?Go to Step 3Go to Step 9
3WARNING: Refer to Moving Parts and Hot Surfaces Warning . Select the FLOOR mode. Select the minimum blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Does the inlet heater hose feel warmer than the outlet heater hose?Go to Step 7Go to Step 4
4Install a thermometer into the center I/P PANEL air outlet. Secure a thermometer to the heater core outlet hose. Select the PANEL mode. Select the maximum blower speed. Select the warmest temperature setting. Record the temperature at the following locations: The center I/P PANEL air outlet The heater core outlet hose Compare the recorded temperatures. Are the 2 temperature readings about equal?Go to Step 5Go to Step 6
5Inspect and repair the following areas of the vehicle for cold air leaks: The cowl The recirculation door The HVAC module case Perform the necessary repairs. Are the repairs complete?Go to Step 10
6Inspect the temperature door operation. Refer to Diagnostic System Check - Vehicle . Perform any necessary repairs. Are the repairs complete?Go to Step 10
7Turn OFF the engine. Backflush the heater core. Start the engine. Select the FLOOR mode. Select the minimum blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Does the inlet heater hose feel warmer than the outlet heater hose?Go to Step 8Go to Step 10
8Replace the heater core. Refer to Heater Core Replacement . Is the repair complete?Go to Step 10
9Repair the low engine temperature concern. Refer to Engine Fails To Reach Normal Operating Temperature . Is the repair complete?Go to Step 10
10Operate the system in order to verify the repair. Did you find and correct the condition?System OKGo to Step 2

Defrosting Insufficient

StepActionYesNo
DEFINITION: Time required to defrost the windshield is longer than normal.
1Were you sent here from Symptoms or another diagnostic table?Go to Step 2Go to Symptoms - HVAC Systems - Automatic
2Start the engine. Select the DEFROST mode. Select the maximum blower speed. Does sufficient air flow from the defroster outlets?Go to Step 3Go to Step 10
3Measure the engine operating temperature. Does engine reach a normal operating temperature?Go to Step 4Go to Step 8
4Select the minimum blower speed. Select the maximum temperature setting. WARNING: Refer to Moving Parts and Hot Surfaces Warning . Feel the temperature of the inlet and outlet hoses at the heater core. Does the inlet hose feel warmer than the outlet hose?Go to Step 11Go to Step 5
5Test the operation of the A/C compressor clutch. Does the A/C compressor clutch engage?Go to Step 7Go to Step 6
6Repair the A/C compressor clutch. Refer to Air Conditioning Compressor Malfunction . Is the repair complete?Go to Step 14
7Perform the A/C system performance test. Refer to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU) . Is the A/C system operating within the specifications?Go to Step 9Go to Step 12
8Repair the low engine temperature concern. Refer to Engine Fails To Reach Normal Operating Temperature . Is the repair complete?Go to Step 14
9Inspect for correct operation of the recirculation door. Is the recirculation door operating correctly?Go to Step 14Go to Step 13
10Repair the air delivery concern. Refer to Diagnostic Starting Point - Vehicle . Is the repair complete?Go to Step 14
11Repair the heating concern. Refer to Heating Performance Diagnostic . Is the repair complete?Go to Step 14
12Repair the A/C performance concern. Refer to Symptoms - HVAC Systems - Automatic . Is the repair complete?Go to Step 14
13Repair the recirculation door concern. Refer to Diagnostic Starting Point - Vehicle . Is the repair complete?Go to Step 14
14Operate the system in order to verify the repair. Did you find and correct the problem?System OKGo to Step 2

Noise Diagnosis - Auxiliary Blower Motor

StepActionYesNo
DEFINITION: Noise originating from the auxiliary blower motor.
1Were you sent here from Symptoms or another diagnostic table?Go to Step 2Go to Diagnostic System Check - Vehicle
2Sit inside the vehicle. Close the vehicle doors and windows. Turn ON the ignition, with the engine OFF. Cycle the auxiliary blower motor through all of the speeds in order to determine where and when the noise occurs. Is a noise evident during auxiliary blower operation?Go to Step 3Go to Step 12
3Inspect for excessive vibration at each auxiliary blower motor speed by feeling the auxiliary blower case. Is excess vibration present?Go to Step 5Go to Step 4
4Listen to the auxiliary blower motor at each blower speed. Is the auxiliary blower motor making a squeaking or chirping noise?Go to Step 10Go to Step 12
5Inspect the blower motor and the blower motor housing for proper installation. Is the blower motor or the blower motor housing touching the vehicles body and causing the vibration?Go to Step 9Go to Step 6
6Remove the auxiliary blower motor. Refer to Auxiliary Blower Motor Replacement . Inspect the auxiliary blower motor impeller for deposits of foreign material. Inspect the auxiliary blower motor for deposits of foreign material. Did you find foreign material on the auxiliary blower motor?Go to Step 8Go to Step 7
7Inspect the auxiliary blower motor for the following conditions: Cracked blades A loose impeller retainer Improper impeller alignment Did you find any of these conditions?Go to Step 9Go to Step 11
8Remove the foreign material. Is the action complete?Go to Step 11
9Install the component so there is no contact with the vehicles body. Is the action complete?Go to Step 12
10Replace the auxiliary blower motor. Refer to Auxiliary Blower Motor Replacement . Is the repair complete?Go to Step 12
11Install the auxiliary blower motor. Refer to Auxiliary Blower Motor Replacement . Is the action complete?Go to Step 12
12Operate the system in order to verify the repair. Did you find and correct the condition?System OKGo to Step 2

Noise Diagnosis - Blower Motor

StepActionYesNo
DEFINITION: Noise originating from the blower motor.
1Were you sent here from Symptoms or another diagnostic table?Go to Step 2Go to
2Inspect the air inlet grille for debris. Is debris present?Go to Step 8Go to Step 3
3Sit inside the vehicle. Close the vehicle doors and windows. Turn ON the ignition, with the engine OFF. Cycle the blower motor through all of the speeds and modes in order to determine where and when the noise occurs. Is a noise evident during the blower operation?Go to Step 4Go to Step 11
4Inspect for excessive vibration at each blower motor speed by feeling the blower case. Is excess vibration present?Go to Step 6Go to Step 5
5Listen to the blower motor at each speed. Is the blower motor making a squeaking or chirping noise?Go to Step 9Go to Step 11
6Remove the blower motor. Refer to Blower Motor Replacement . Inspect the blower motor impeller for deposits of foreign material. Inspect the blower motor for deposits of foreign material. Did you find any foreign material on the blower motor or blower motor impeller?Go to Step 8Go to Step 7
7Inspect the blower motor for the following conditions: Cracked blades A loose impeller retainer Improper impeller alignment Did you find any of these conditions?Go to Step 9Go to Step 10
8Remove the foreign material. Is the action complete?Go to Step 10
9Replace the blower motor. Refer to Blower Motor Replacement . Is the repair complete?Go to Step 11
10Install the blower motor. Refer to Blower Motor Replacement . Is the action complete?Go to Step 11
11Operate the system in order to verify the repair. Did you find and correct the condition?System OKGo to Step 2

Air Conditioning Compressor Oil Diagnosis

Note. To avoid repeat compressor failure, always inspect the condition of the refrigerant oil and take the appropriate corrective action before installing the replacement compressor.

ConditionCorrective Action
Clean Oil no debris presentNo corrective action necessary.
Clean Oil with debris presentInspect the suction port of the replacement compressor for presence of a suction screen. If the Replacement Compressor does NOT contain a suction screen, Install Suction Screen in the line. Replace desiccant or component containing the desiccant. Replace desiccant filter if applicable. Remove and inspect high pressure side filter (if applicable). Remove, inspect, clean, or replace orifice tube. If the system has a front orifice tube and is equipped with a filter in the rear auxiliary line, remove, inspect, clean, or replace the filter. If the system has a front orifice tube and is not equipped with a filter in the rear auxiliary line, remove the filter in the auxiliary TXV and Install a universal inline A/C Filter P/N 89016656 (AC Delco P/N 15-10413) as close to the rear TXV as possible.
Dark brown/black and/or pungent/unusual odor with no debris presentReplace desiccant or component containing the desiccant. Replace desiccant filter if applicable. Flush refrigerant system. Refer to Flushing
Dark brown/black and/or pungent/unusual odor with debris presentReplace desiccant or component containing the desiccant. Replace desiccant filter if applicable. Flush refrigerant system. Refer to Flushing Inspect the suction port of the replacement compressor for presence of a suction screen. If the replacement compressor does NOT contain a suction screen, install suction screen. Remove and inspect high pressure side filter (if applicable). Remove, inspect, clean, or replace orifice tube. If the system has a front orifice tube and is equipped with a filter in the rear auxiliary line, remove, inspect, clean, or replace the filter. If the system has a front orifice tube and is not equipped with a filter in the rear auxiliary line, remove the filter in the auxiliary TXV and install a universal inline A/C Filter P/N 89016656 (AC Delco P/N 15-10413) as close to the rear TXV as possible.
Oil OverchargeFlush refrigerant system. Refer to Flushing
Refrigerant ContaminationFlush refrigerant system. Refer to Flushing
Hybrid Polyolester Refrigerant Oil (POE) ContaminationFlush refrigerant system. Refer to Flushing Replace desiccant or component containing the desiccant. Replace desiccant filter if applicable.

Noise Diagnosis - Air Conditioning (A/C) System

StepActionYesNo
1Were you sent here from Symptoms or another diagnostic table?Go to Step 2Go to Symptoms - HVAC Systems - Automatic
2A/C system noises can be generally categorized into 3 areas: Screeching, squealing, chirping noises Moaning noises Vibration/rattle noises Start the engine. Ensure that the A/C is ON. Is a screeching, squealing noise heard when the A/C is ON?Go to Step 3Go to Step 6
3With the engine OFF, inspect the drive belt for excessive wear. Refer to Drive Belt Falls Off and Excessive Wear Diagnosis . Is the drive belt excessively worn?Go to Step 14Go to Step 4
4Inspect the drive belt tension. Refer to Drive Belt Tensioner Diagnosis . Is the drive belt tension correct?Go to Step 15Go to Step 5
5Inspect the drive belt for excessive oil coverage. Is the drive belt covered with oil?Go to Step 13Go to Step 6
6Start the engine. Ensure that the A/C is ON. Is the compressor locked up?Go to Step 19Go to Step 7
7Using a stethoscope, listen to the A/C compressor for any abnormal noises. Is the compressor causing an abnormal noise?Go to Step 11Go to Step 8
8Listen to the A/C compressor components and mounting for noise concerns using a stethoscope. Are any of these components loose, damaged or excessively worn?Go to Step 16Go to Step 9
9Idle the engine. Engage the A/C. Using a stethoscope, move around the entire refrigerant plumbing system, inspecting for any abnormal noises caused by component ground-out. Are any of the A/C components grounding out and causing a noise?Go to Step 21Go to Step 10
101. Idle the engine in PARK with the A/C on. 2. Using a stethoscope, move around the entire A/C system testing for any abnormal noises caused by a component. Do any of the A/C components cause an abnormal noise?Go to Step 17Go to Step 20
11Verify that the A/C system is properly charged. Refer to Refrigerant System Specifications . Is the A/C system properly charged?Go to Step 19Go to Step 16
12Recharge the A/C system to specification. Refer to Refrigerant Recovery and Recharging . Is the abnormal compressor noise still present?Go to Step 20Go to Step 21
13Repair the oil leak. Refer to the appropriate repair procedure in Engine Mechanical. Is the repair complete?Go to Step 21
14Replace the drive belt. Refer to Drive Belt Replacement . Is the replacement complete?Go to Step 21
15Replace the drive belt tensioner. Refer to Drive Belt Replacement . Is the replacement complete?Go to Step 21
16Repair or replace the A/C compressor mounting component. Is the repair complete?Go to Step 21
17Repair or replace the component which is causing the moaning concern as needed. Is the repair complete?Go to Step 21
18Correctly route or insulate the A/C component. Is the repair complete?Go to Step 21
19Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement (LF1) or Air Conditioning Compressor Replacement (LAU) . Is the replacement complete?Go to Step 21
20The concern may be caused by an engine related component. Refer to Vibration Analysis - Engine . Did you find and correct the condition?Go to Step 21
21Operate the system in order to verify the repair. Did you find and correct the condition?System OKGo to Step 2

Noise Diagnosis - HVAC Module

StepActionYesNo
DEFINITION: Noise originating from the HVAC module.
1Were you sent here from Symptoms or another diagnostic table?Go to Step 2Go to Symptoms - HVAC Systems - Automatic
2Start the engine. Cycle through all of the following: Blower motor speeds HVAC modes Temperature control settings Determine the type of noise: Scrape, pop Tick/click, chirp or groaning Air rush/whistle Is a scrape or pop noise evident when selecting modes or temperature settings?Go to Step 6Go to Step 3
3Is a tick/click, chirping, groaning or scraping noise present, but decreases as blower motor speed is decreased?Go to Step 6Go to Step 4
4Is an air rush/whistle noise evident in all modes but not all temperature settings?Go to Step 6Go to Step 5
5Is an air rush/whistle noise evident only in defrost or floor mode?Go to Step 6Go to Step 6
6Remove the instrument panel (I/P) carrier. Refer to Instrument Panel Tie Bar Replacement . Is the action complete?Go to Step 7
7Inspect the air flow doors for proper operation. Inspect the ducts for obstructions or foreign materials. Were any of these conditions found?Go to Step 10Go to Step 8
8Inspect the mode and temperature doors and seals for warping or cracking. Are the doors in normal condition?Go to Step 11Go to Step 9
9Replace the appropriate door and/or seals. Is the repair complete?Go to Step 11
10Remove any obstructions or foreign material found. Is the action complete?Go to Step 11
11Install the I/P carrier. Refer to Instrument Panel Tie Bar Replacement . Is the action complete?Go to Step 12
12Operate the system to verify the repair. Did you find and correct the condition?System OKGo to Step 2

Odor Diagnosis

StepActionYesNo
DEFINITION: Odor originating or noticed through the HVAC system.
1Were you sent here from Symptoms or another diagnostic table?Go to Step 2Go to Symptoms - HVAC Systems - Automatic
2Sit inside the vehicle. Close all of the doors and windows. Start the engine. Allow the engine idle at normal operating temperature. Select the maximum blower speed. Select the PANEL air outlet mode. Select the coldest temperature setting. Cycle through all of the blower speeds, modes and temperatures to define what type of odor is present. Musty smell Coolant smell Oil smell Does the odor have a musty smell?Go to Step 3Go to Step 8
3Inspect the HVAC filter and the air inlet grille for debris. Refer to Passenger Compartment Air Filter Replacement . Is debris present?Go to Step 4Go to Step 5
4Remove any debris. Is the action complete?Go to Step 15
5Inspect for wet carpeting. Is the carpet wet?Go to Step 6Go to Step 14
6Inspect for the following conditions: Water leaks around the windshield Blockage of the HVAC module drain Leaks around the door seals Is a leak present?Go to Step 7Go to Step 14
7Repair the leak as necessary. Is the repair complete?Go to Step 15
8Does the odor have a coolant smell?Go to Step 9Go to Step 12
9Inspect the cooling system for leaks. Refer to Loss of Coolant . Is a leak present?Go to Step 10Go to Step 12
10Inspect for coolant leaking inside the vehicle or for a film build-up on the windshield. Is the condition present?Go to Step 11Go to Step 15
11Replace the heater core. Refer to Heater Core Replacement . Is the repair complete?Go to Step 15
12Does the odor have an oily smell?Go to Step 13Go to Step 15
13Inspect the engine compartment for any leaks. Refer to the following procedures: Oil Leak Diagnosis for the 3.0L LF1engine or for the 2.8L LAUL engine Power Steering Fluid Leaks . Repair any oil leaks. Is the repair complete?Go to Step 15
14A musty odor can be caused by mold or mildew build-up on the evaporator or the heater core or inside of the HVAC module. Refer to Odor Correction . Is the action complete?Go to Step 15
15Operate the system in order to verify the repair. Did you find and correct the condition?System OKGo to Step 2

Eliminating Air Conditioning Odor

Odors may be emitted from the air conditioning system primarily at start up in hot, humid climates. The following conditions may cause the odor

  1. Debris is present in the HVAC module.
  2. Microbial growth on the evaporator core

When the blower motor fan is turned on, the microbial growth may release an unpleasant musty odor into the passenger compartment. To remove odors of this type, the microbial growth must be eliminated. Perform the following procedure

Deodorize the evaporator core using Deodorizing Aerosol Kit.

Perform the following steps in order to deodorize the A/C system

  1. Ensure that the plenum that draws outside air into the HVAC module is clear of debris.
  2. Disable the A/C compressor clutch operation by disconnecting the clutch coil electrical connector.
  3. Dry the evaporator core by performing the following steps: Start the engine. Select the maximum temperature setting. Select the recirculation mode. Run the blower motor on high for 10 minutes.
  4. Locate an area in the air conditioning duct between the blower motor and the evaporator core downstream of the blower motor.
  5. Drill a 3.175 mm (0.125 in) hole where the hole will not interfere with or damage the following components: The blower motor The evaporator core Any other operating part the of system
  6. Wear safety goggles and latex gloves in order to perform the following actions: Select the maximum blower speed. Insert the deodorizer extension tube into the hole to the mark on the extension tube. Use short spray bursts and vary the direction of spray for a 2-3 minute period of time.
  7. Shut the engine OFF. Allow the vehicle to sit for 3-5 minutes.
  8. Seal the 3.175 mm (0.125 in) hole with body sealer or RTV gasket compound.
  9. Start the engine.
  10. Operate the blower motor on high for 15-20 minutes to dry.
  11. Reconnect the A/C compressor clutch coil electrical connector.
  12. Verify proper clutch operation.
  13. Using the scan tool enable the afterblow. Refer to «Afterblow Enabling»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#hvac-system-automatic__afterblow-enabling) .
  1. GE-8800: ACR 2000 Air Conditioning Service Center
  2. GE-45037-A: A/C Oil Injector
WARNINGTo prevent personal injury, avoid breathing A/C Refrigerant and lubricant vapor or mist. Work in a well ventilated area. To remove refrigerant from the A/C System, use service equipment designed for recovery that is certified to meet the requirements of the appropriate SAE Standards. If an accidental system discharge occurs, ventilate the work area before continuing service. Additional health and safety information may be obtained from the refrigerant, refrigerant recovery, and lubricant manufacturers.
WARNINGFor personal protection, goggles and lint-free gloves should be worn and a clean cloth wrapped around fittings, valves, and connections when doing work that includes opening the refrigerant system. If refrigerant comes in contact with any part of the body severe frostbite and personal injury can result. The exposed area should be flushed immediately with cold water and prompt medical help should be obtained.
CAUTIONYou must replace the desiccant if the A/C refrigerant system has been open to atmosphere for more than four hours, or if the A/C refrigerant oil has been contaminated. Failure to replace the desiccant will result in damage to the A/C refrigerant system.
CAUTIONR-134a is the only approved refrigerant for use in this vehicle. The use of any other refrigerant may result in poor system performance or component failure.
CAUTIONTo avoid system damage use only R-134a dedicated tools when servicing the A/C system.
CAUTIONUse only Polyalkylene Glycol Synthetic Refrigerant Oil (PAG) for internal circulation through the R-134a A/C system and only 525 viscosity mineral oil on fitting threads and O-rings. If lubricants other than those specified are used, compressor failure and/or fitting seizure may result.
CAUTIONR-12 refrigerant and R-134a refrigerant must never be mixed, even in the smallest of amounts, as they are incompatible with each other. If the refrigerants are mixed, compressor failure is likely to occur. Refer to the manufacturer instructions included with the service equipment before servicing.

The GE-8800: service center is a complete air conditioning service center for R-134a. The ACR 2000 recovers, recycles, evacuates and recharges A/C refrigerant quickly, accurately and automatically. The unit has a display screen that contains the function controls and displays prompts that will lead the technician through the recover, recycle, evacuate and recharge operations. R-134a is recovered into and charged out of an internal storage vessel. The ACR 2000 automatically replenishes this vessel from an external source tank in order to maintain a constant 5.45-6.82 kg (12-15 lbs) of A/C refrigerant.

The ACR 2000 has a built in A/C refrigerant identifier that will test for contamination, prior to recovery and will notify the technician if there are foreign gases present in the A/C system. If foreign gases are present, the ACR 2000 will not recover the refrigerant from the A/C system.

The ACR 2000 also features automatic air purge, single pass recycling and an automatic oil drain.

Refer to the GE-8800: service center ACR 2000 manual for operation and setup instruction. Always recharge the A/C System with the proper amount of R-134a. Refer to Refrigerant System Specifications

A/C Refrigerant System Oil Charge Replenishing

If oil was removed from the A/C system during the recovery process or due to component replacement, the oil must be replenished. Oil can be injected into a charged system using GE-45037-A: injector. For the proper quantities of oil to add to the A/C refrigerant system, refer to Refrigerant System Specifications

  1. GE-8800: ACR 2000 Air Conditioning Service Center
  2. GE-45268: Flush Adapter Kit
  3. GE-41447: Leak Detection Dye
  4. GE-42220: Universal 12V Leak Detection Lamp

For equivalent regional tools. Refer to Special Tools

Note. Flushing with the GE-8800: ACR 2000 Air Conditioning Service Center is not intended to remove metal from the A/C system.

Flushing is intended to remove the following

Recovery & Flushing Procedure

  1. Contaminated polyalkylene glycol (PAG) oil
  2. Desiccant, following a desiccant bag failure
  3. Overcharge of PAG oil
  4. Refrigerant contamination

Scheme 3

Scheme 3
Scheme 3
  1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  2. Remove the thermal expansion valve (TXV). Refer to «Air Conditioning Evaporator Thermal Expansion Valve Replacement»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  3. Install the stud for the GE 45268: Flush Adapter Kit kit onto the GE 45268-115.
  4. Install the GE 45268-115 in place of the TXV.
  5. Install the TXV mounting bolts. Tighten: Tighten the bolts to 7 N.m (62 lb in).
  6. Connect the evaporator line to the GE 45268-115.
  7. Install the TXV block fitting nut. Tighten: Tighten the bolts to 17 N.m (12.5 lb ft).
  8. Remove the A/C compressor. Refer to «Air Conditioning Compressor Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) or «Air Conditioning Compressor Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  9. Install GE 45268-10 to the A/C compressor hose assembly.
  10. Install the nut and bolt from the GE 45268: Flush Adapter Kit kit to the GE 45268-10 and compressor hose assembly. Tighten: Tighten the bolts to 17 N.m (12.5 lb ft).
  11. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil. Perform the following procedure: NOTE: The filter inside GE 45268-1 is serviceable. Remove and discard the check valve from the filter. Service the filter with ACDelco P/N GF 470, before each flush. Install the port plugs GE 45268-9 onto the GE 45268-10. Install the fitting GE 45268-7 onto the GE 45268-10. Install the fitting GE 45268-8 onto the GE 45268-10. Connect GE 45268-1 flush filter to the suction port of GE 45268-7 flush adapter. Connect the blue hose from the GE 8800: ACR 2000 Air Conditioning Service Center to the GE 45268-1 flush filter adapter. Connect the red hose from the GE 8800: ACR 2000 Air Conditioning Service Center to the GE 45268-8 flush adapter.
  12. Reverse flow refrigerant flush is recommended for desiccant bag failure. Replace the A/C condenser when the A/C flush is complete and perform the following procedure: NOTE: The filter inside GE 45268-1 is serviceable. Remove and discard the check valve from the filter. Service the filter with ACDelco P/N GF 470, before each flush. Install the port plugs GE 45268-9 onto the J 45268-10. Install the fitting GE 45268-7 onto the J 45268-10. Install the fitting GE 45268-8 onto the J 45268-10. Connect GE 45268-1 flush filter to the discharge port of GE 45268-7 flush adapter. Connect the blue hose from GE 8800: ACR 2000 Air Conditioning Service Center to the GE 45268-1 flush filter adapter. Connect the red hose from GE 8800: ACR 2000 Air Conditioning Service Center to the GE 45268-8 flush adapter.
  13. Flush the A/C system. Follow the instructions supplied with the GE 8800: ACR 2000 Air Conditioning Service Center.
  14. Disconnect the red hose on the GE 8800: ACR 2000 Air Conditioning Service Center from the GE 45268-10.
  15. Disconnect the blue hose on the GE 8800: ACR 2000 Air Conditioning Service Center from the GE 45268-1.
  16. Remove GE 45268-1 from the GE 45268-10.
  17. Remove the GE 45268-10 from the A/C compressor hose assembly.
  18. If you will reinstall the removed A/C compressor, perform the following procedure: Remove the A/C compressor drain plug. Drain the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor. Install the A/C compressor drain plug. Tighten: Tighten the drain plug to 16 N.m (12 lb ft). Add the total system capacity of PAG oil to the A/C compressor. Refer to «Refrigerant System Specifications»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-specifications)
  19. If you will replace the A/C compressor after flushing the system, perform the following procedure: Determine if the new service compressor is shipped with PAG oil. Refer to the «Refrigerant System Specifications»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-specifications) If the service compressor is shipped with PAG oil, DO NOT drain the new PAG oil from the compressor. Deduct the amount of PAG oil shipped with the service compressor from the amount of PAG oil listed in the capacities table. Refer to «Refrigerant System Specifications»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-specifications) Add the calculated amount to the compressor, as needed.
  20. Add one bottle of GE 41447: Leak Detection Dye directly to the A/C Compressor.
  21. Install the A/C compressor. Refer to «Air Conditioning Compressor Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) or «Air Conditioning Compressor Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  22. Remove GE 45268-115.
  23. Inspect the TXV for debris. Clean or replace as needed.
  24. Install the TXV. Refer to «Air Conditioning Evaporator Thermal Expansion Valve Replacement»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  25. Evacuate and recharge the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  26. Leak test the fittings using GE 42220: Universal 12V Leak Detection Lamp.

Draining Procedure

  1. Drain the refrigerant oil from the crankcase and rear head ports into a clean, graduated container.
  2. Rotate the compressor shaft to assist in draining the compressor.
  3. Measure and record the amount of oil drained from the removed compressor. This measurement will be used during installation of the replacement compressor.
  4. Inspect oil drained from removed compressor. Refer to «Air Conditioning Compressor Oil Diagnosis»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-compressor-oil-diagnosis) .
  5. Properly discard the used refrigerant oil.
  6. Clean the graduated cylinder.
  7. Drain bolt and drain the refrigerant oil from the crankcase and rear head ports into a clean, graduated container.
  8. Rotate the compressor shaft to assist in draining the compressor.

Balancing Procedure

  1. Refer to the amount of refrigerant oil recorded during the compressor removal.
  2. If the amount of oil recorded from the removed compressor is less than or equal to 75 ml (2.5 fl. oz.), add 75 ml of the new PAG oil back into the new compressor through the compressor suction port.
  3. If the amount of oil recorded from the removed compressor is greater than 75 ml (2.5 fl. oz.), add the equivalent amount of the new PAG oil back into the new compressor through the compressor suction port.
  4. Rotate the clutch driver three times to lubricate the internal compressor components.
  5. If necessary, refer to «Refrigerant System Specifications»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-specifications) .

Scheme 4

Scheme 4: Air Conditioning Compressor Replacement (LF1)
Scheme 4: Air Conditioning Compressor Replacement (LF1)
CalloutComponent Name
Preliminary Procedures Recover the refrigerant. Refer to Refrigerant Recovery and Recharging . Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle Remove front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement . Remove the drive belt from the compressor. Refer to Drive Belt Replacement . Disconnect the A/C compressor electrical connector. Remove the air conditioning condenser and evaporator hose from the compressor. Refer to Air Conditioning Condenser and Evaporator Hose Replacement (LF1)
1A/C Compressor Bolt CAUTION: Refer to Fastener Caution . Tighten: 58 N.m (43 lb ft)
2A/C Compressor Nut Tighten: 22 N.m (12 lb ft)
3A/C Compressor Bolt Tighten: 58 N.m (43 lb ft)
4A/C Compressor Procedure Remove and discard sealing washers. Refer to Air Conditioning System Seal Replacement . When replacing the A/C compressor, balance the compressor oil. Refer to Air Conditioning Compressor Oil Balancing .
CAUTION
Refer to Fastener Caution .

Scheme 5

Scheme 5: Air Conditioning Compressor Replacement (LAU)
Scheme 5: Air Conditioning Compressor Replacement (LAU)
CalloutComponent Name
Preliminary Procedures Recover the refrigerant. Refer to Refrigerant Recovery and Recharging . Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle Remove front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement . Remove the drive belt. Refer to Drive Belt Replacement . Disconnect the A/C compressor electrical connector. Remove the air conditioning condenser and evaporator hose. Refer to Air Conditioning Condenser and Evaporator Hose Replacement (LAU)
1A/C Compressor Bolt CAUTION: Refer to Fastener Caution . Tighten: 22 N.m (22 lb ft)
2A/C Compressor Procedure Remove and discard sealing washers. Refer to Air Conditioning System Seal Replacement . When replacing the A/C compressor, balance the compressor oil. Refer to Air Conditioning Compressor Oil Balancing .
CAUTION
Refer to Fastener Caution .

Scheme 6

Scheme 6: Compressor Pressure Relief Valve Replacement (LF1)
Scheme 6: Compressor Pressure Relief Valve Replacement (LF1)
CalloutComponent Name
Preliminary Procedures Recover the refrigerant. Refer to Refrigerant Recovery and Recharging . Remove the air conditioning compressor. Refer to Air Conditioning Compressor Replacement (LF1) or Air Conditioning Compressor Replacement (LAU) .
1Compressor Pressure Relief Valve CAUTION: Refer to Fastener Caution . Procedure: Remove and discard sealing washers. Refer to Air Conditioning System Seal Replacement . Tighten: 8 N.m (70 lb in)
CAUTION
Refer to Fastener Caution .

Scheme 7

Scheme 7: Compressor Pressure Relief Valve Replacement (LAU)
Scheme 7: Compressor Pressure Relief Valve Replacement (LAU)
CalloutComponent Name
Preliminary Procedures Recover the refrigerant. Refer to Refrigerant Recovery and Recharging . Remove the air conditioning compressor. Refer to Air Conditioning Compressor Replacement (LAU) .
1Compressor Pressure Relief Valve CAUTION: Refer to Fastener Caution . Procedure: Remove and discard sealing washers. Refer to Air Conditioning System Seal Replacement . Tighten: 8 N.m (70 lb in)
CAUTION
Refer to Fastener Caution .

Scheme 8

Scheme 8: Air Conditioning Compressor Bracket Replacement (LAU)
Scheme 8: Air Conditioning Compressor Bracket Replacement (LAU)
CalloutComponent Name
Preliminary Procedures: Remove the compressor. Refer to Air Conditioning Compressor Replacement (LAU)
1A/C Compressor Bracket Bolts (Qty 3). CAUTION: Refer to Fastener Caution . Tighten: 58 N.m (43 lb ft)
2A/C Comperssor Bracket
CAUTION
Refer to Fastener Caution .

Removal Procedure

  1. Remove the seal washer from the A/C refrigerant component.
  2. Inspect the seal washer for any signs of damage.
  3. Inspect the A/C refrigerant components for damage or burrs. Repair or replace as necessary.
  4. Discard the sealing washer.

Installation Procedure

  1. Inspect the new seal washer for any signs of cracks, cuts, or damage. Do not use a damaged seal washer.
  2. Using a lint-free clean, dry cloth, clean the sealing surfaces of the A/C refrigerant components.
  3. Carefully install the new seal washer onto the A/C refrigerant component.
  4. The washer must completely bottom against the surface of the fitting.
  5. Assemble the remaining A/C refrigerant components. Refer to the appropriate repair procedure.
  1. Disassemble the A/C refrigerant components. Refer to the appropriate repair procedure For compression style fittings use a back up wrench on the fitting (2) and loosen the fitting nut (1). For banjo style fittings remove the bolt retaining the banjo type fitting.
  2. Remove the O-ring seal from the A/C refrigerant component.
  3. Inspect the O-ring seal for signs of damage to help determine the root cause of the failure.
  4. Inspect the A/C refrigerant components for damage or burrs. Repair if necessary.
  5. Cap or tape the A/C refrigerant components.
  6. Discard the O-ring seal.
  1. Inspect the new O-ring seal for any sign or cracks, cuts, or damage. Replace if necessary.
  2. Remove the cap or tape from the A/C refrigerant components.
  3. Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the A/C refrigerant components.
  4. Lightly coat the new O-ring seal with mineral base 525 viscosity refrigerant oil.
  5. Carefully slide the new O-ring seal onto the A/C refrigerant component.
  6. The O-ring seal must be fully seated.
  7. Assemble the A/C components. Refer to the appropriate repair procedure. For compression style fittings use a back up wrench on the fitting (2) and tighten the fitting nut (1) to specification. For banjo style fittings install the bolt retaining the banjo type fitting and tighten to specification.
  1. Recover the refrigerant from the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  2. Remove the intake manifold cover. refer to «Intake Manifold Cover Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2)
  3. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-28l-30l-repair-instructions) or «Air Cleaner Assembly Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-28l-30l-repair-instructions)
  4. Remove the radiator air lower deflector. Refer to «Radiator Air Lower Deflector Replacement»(/cadillac/srx/ii-2009-2012/remont/exterior-body-panels/#bumpers-and-fascia)
  5. Remove the air conditioning condenser and air conditioning evaporator tube nut (1) at thermal expansion valve.
  6. Remove the air conditioning condenser and air conditioning evaporator tube (2) from thermal expansion valve.
  7. Remove the air conditioning condenser and air conditioning evaporator tube nut (1) at condenser.
  8. Remove the air conditioning condenser and air conditioning evaporator tube (2) from condenser.
  9. Remove the air conditioning condenser and evaporator hose nut (1) at air conditioning condenser and air conditioning evaporator tube.
  10. Remove the air conditioning condenser and evaporator hose (2) from air conditioning condenser and air conditioning evaporator tube
  11. Remove the air conditioning condenser and air conditioning evaporator tube nut (1) at the frame rail.
  12. Disengage tube retainers from body.
  13. Remove the air conditioning condenser and air conditioning evaporator tube (2) from vehicle.
  1. Install the air conditioning condenser and air conditioning evaporator tube (2) to the vehicle.
  2. Engage tube retainers from body.
  3. Install the air conditioning condenser and air conditioning evaporator tube nut (1) at the frame rail and tighten to 15 N.m (11 lb in).
  4. Install the air conditioning condenser and evaporator hose (2) from air conditioning condenser and air conditioning evaporator tube
  5. Install the air conditioning condenser and evaporator hose nut (1) at air conditioning condenser and air conditioning evaporator tube and tighten to 15 N.m (11 lb in).
  6. Install the air conditioning condenser and air conditioning evaporator tube (2) from condenser.
  7. Install the air conditioning condenser and air conditioning evaporator tube nut (1) at condenser and tighten to 15 N.m (11 lb in).
  8. Install the air conditioning condenser and air conditioning evaporator tube (2) from thermal expansion valve.
  9. Install the air conditioning condenser and air conditioning evaporator tube nut (1) at thermal expansion valve and tighten to 15 N.m (11 lb in).
  10. Install the radiator air lower deflector. Refer to «Radiator Air Lower Deflector Replacement»(/cadillac/srx/ii-2009-2012/remont/exterior-body-panels/#bumpers-and-fascia)
  11. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-28l-30l-repair-instructions) or «Air Cleaner Assembly Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-28l-30l-repair-instructions)
  12. Install the intake manifold cover. refer to «Intake Manifold Cover Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2)
  13. Evacuate and charge the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  1. Recover the refrigerant from the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  2. Raise and support the vehicle. Refer to «Air Cleaner Assembly Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-28l-30l-repair-instructions)
  3. Remove the front bumper fascia. Refer to «Front Bumper Fascia Replacement»(/cadillac/srx/ii-2009-2012/remont/exterior-body-panels/#bumpers-and-fascia)
  4. Disconnect the air conditioning pressure sensor electrical connector.
  5. Remove the air conditioning condenser and evaporator hose bolt (1) at the compressor.
  6. Remove the air conditioning condenser and evaporator hose (2) from the compressor.
  7. Remove the air conditioning condenser and evaporator hose nut (1) at the air conditioning condenser and air conditioning evaporator tube.
  8. Remove the air conditioning condenser and evaporator hose (2) from air conditioning condenser and air conditioning evaporator tube.
  9. Remove the air conditioning condenser and evaporator hose nut (1) at the condenser.
  10. Remove the air conditioning condenser and evaporator hose (2) from the condenser.
  11. Remove the air conditioning condenser and evaporator hose (2) from vehicle.
  12. Remove and discard all sealing washers.
  13. Transfer the air conditioning pressure sensor if necessary.
  1. Install new sealing washers. Refer to «Air Conditioning System Seal Replacement»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  2. Install the air conditioning condenser and evaporator hose (2) to the condenser.
  3. Install the air conditioning condenser and evaporator hose nut (1) at the condenser and tighten to 15 N.m (11 lb in).
  4. Install the air conditioning condenser and evaporator hose (2) to the air conditioning condenser and air conditioning evaporator tube.
  5. Install the air conditioning condenser and evaporator hose nut (1) to air conditioning condenser and air conditioning evaporator tube and tighten to 15 N.m (11 lb in).
  6. Install the air conditioning condenser and evaporator hose (2) to the compressor.
  7. Install the air conditioning condenser and evaporator hose bolt (1) at compressor and tighten to 15 N.m (11 lb in).
  8. Connect the air conditioning pressure sensor electrical connector.
  9. Install the front bumper fascia. Refer to «Front Bumper Fascia Replacement»(/cadillac/srx/ii-2009-2012/remont/exterior-body-panels/#bumpers-and-fascia)
  10. Lower the vehicle.
  11. Evacuate and charge the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  1. Recover the refrigerant from the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  2. Raise and support the vehicle. Refer to «Air Cleaner Assembly Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/testing-diagnostics/#engine-control-system-fuel-system-28l-30l-repair-instructions)
  3. Remove the front bumper fascia. Refer to «Front Bumper Fascia Replacement»(/cadillac/srx/ii-2009-2012/remont/exterior-body-panels/#bumpers-and-fascia)
  4. Remove the air conditioning condenser and evaporator hose bolt (1) at the compressor.
  5. Remove the air conditioning condenser and evaporator hose (2) from the compressor.
  6. Remove the air conditioning condenser and evaporator hose nut (1) at the air conditioning condenser and air conditioning evaporator tube.
  7. Remove the air conditioning condenser and evaporator hose (2) from air conditioning condenser and air conditioning evaporator tube.
  8. Remove the air conditioning condenser and evaporator hose nut (1) at the condenser.
  9. Remove the air conditioning condenser and evaporator hose (2) from the condenser.
  10. Remove the air conditioning condenser and evaporator hose (2) from vehicle.
  11. Remove and discard all sealing washers.
  1. Install new sealing washers. Refer to «Air Conditioning System Seal Replacement»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  2. Install the air conditioning condenser and evaporator hose (2) to the condenser.
  3. Install the air conditioning condenser and evaporator hose nut (1) at the condenser and tighten to 15 N.m (11 lb in).
  4. Install the air conditioning condenser and evaporator hose (2) to the air conditioning condenser and air conditioning evaporator tube.
  5. Install the air conditioning condenser and evaporator hose nut (1) to air conditioning condenser and air conditioning evaporator tube and tighten to 15 N.m (11 lb in).
  6. Install the air conditioning condenser and evaporator hose (2) to the compressor.
  7. Install the air conditioning condenser and evaporator hose bolt (1) at compressor and tighten to 15 N.m (11 lb in).
  8. Install the front bumper fascia. Refer to «Front Bumper Fascia Replacement»(/cadillac/srx/ii-2009-2012/remont/exterior-body-panels/#bumpers-and-fascia)
  9. Lower the vehicle.
  10. Evacuate and charge the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  1. GE 50078: Electronic Leak Detector
  2. GE 46246: Valve Core Tool

For equivalent regional tools. Refer to Special Tools

  1. Recover the refrigerant from the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  2. Using the GE 46246: Valve Core Tool, remove the valve core from the service port.
  1. Install the valve core to the service port.
  2. Using the GE 46246: Valve Core Tool, tighten the valve core to 11 N.m (97 lb in).
  3. Evacuate and recharge the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/srx/ii-2009-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  4. Leak test the fittings of the component using GE 50078: Electronic Leak Detector.

Scheme 9

Scheme 9: Receiver and Dehydrator Replacement
Scheme 9: Receiver and Dehydrator Replacement
CalloutComponent Name
Preliminary Procedure: Remove the air conditioner condenser. Refer to Air Conditioning Condenser Replacement (LF1) or Air Conditioning Condenser Replacement (LAU)
1Receiver and Dehydrator Bracket Blot. CAUTION: Refer to Fastener Caution . Tighten: 6 N.m (53 lb in)
2Receiver and Dehydrator Bracket
3Receiver and Dehydrator Bolt Tighten: 6 N.m (53 lb in)
4Receiver and Dehydrator Procedure: Remove and discard O-ring seal. Refer to Air Conditioning O-Ring Seal Replacement
CAUTION
Refer to Fastener Caution .

Scheme 10

Scheme 10: Air Conditioning Evaporator Thermal Expansion Valve Replacement
Scheme 10: Air Conditioning Evaporator Thermal Expansion Valve Replacement
CalloutComponent Name
Preliminary Procedures Recover the refrigerant. Refer to Refrigerant Recovery and Recharging . Remove the air conditioning condenser and air conditioning evaporator tube from the TXV valve. Refer to Air Conditioning Condenser and Air Conditioning Evaporator Tube Replacement .
1Thermal Expansion Valve Bolt (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 6 N.m (53 lb in)
2Thermal Expansion Valve Tip: Remove and discard the sealing washers. Refer to Air Conditioning System Seal Replacement .
CAUTION
Refer to Fastener Caution .

Scheme 11

Scheme 11: Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LF1)
Scheme 11: Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LF1)
CalloutComponent Name
Preliminary Procedures Recover the refrigerant. Refer to Refrigerant Recovery and Recharging . Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement
1A/C Refrigerant Pressure Sensor CAUTION: Refer to Fastener Caution . Tighten: 5 N.m (44 lb in)
CAUTION
Refer to Fastener Caution .

Scheme 12

Scheme 12: Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LAU)
Scheme 12: Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LAU)
CalloutComponent Name
Preliminary Procedures Recover the refrigerant. Refer to Refrigerant Recovery and Recharging . Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement
1A/C Refrigerant Pressure Sensor CAUTION: Refer to Fastener Caution . Tighten: 5 N.m (44 lb in)
CAUTION
Refer to Fastener Caution .

Scheme 13

Scheme 13: Evaporator Air Temperature Sensor Replacement
Scheme 13: Evaporator Air Temperature Sensor Replacement
CalloutComponent Name
Preliminary Procedures Remove the instrument panel compartment. Refer to Instrument Panel Compartment Replacement . Reposition any wiring or hoses to gain access to evaporator temperature sensor.
1Evaporator Temperature Sensor Procedure Disconnect the wiring connector Rotate sensor 1/4 turn counter clock wise to remove

Scheme 14

Scheme 14: Air Conditioning Condenser Replacement (LF1)
Scheme 14: Air Conditioning Condenser Replacement (LF1)
CalloutComponent Name
Preliminary Procedures Recover the refrigerant. Refer to Refrigerant Recovery and Recharging Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement Remove the radiator air side baffles. Refer to Radiator Air Side Baffle Replacement - Left Side and Radiator Air Side Baffle Replacement - Right Side Remove the air conditioning condenser and air conditioning evaporator hose tube. Refer to Air Conditioning Condenser and Air Conditioning Evaporator Tube Replacement Remove the air conditioning condenser and evaporator hose. Refer to Air Conditioning Condenser and Evaporator Hose Replacement (LF1)
1Air Conditioning Condenser Bolts (Qty 2) CAUTION: Refer to Fastener Caution . Tighten: 9 N.m (80 lb in)
2Air Conditioning Condenser Tip: The air condition condenser is removed through the bottom.
CAUTION
Refer to Fastener Caution .

Scheme 15

Scheme 15: Air Conditioning Condenser Replacement (LAU)
Scheme 15: Air Conditioning Condenser Replacement (LAU)
CalloutComponent Name
Preliminary Procedures Recover the refrigerant. Refer to Refrigerant Recovery and Recharging Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement Remove the radiator air side baffle and deflector. Refer to Radiator Air Side Baffle Replacement - Left Side and Radiator Air Side Baffle Replacement - Right Side Remove the air conditioning condenser and air conditioning evaporator hose tube. Refer to Air Conditioning Condenser and Air Conditioning Evaporator Tube Replacement Remove the air conditioning condenser and evaporator hose. Refer to Air Conditioning Condenser and Evaporator Hose Replacement (LF1) or Air Conditioning Condenser and Evaporator Hose Replacement (LAU)
1Air Conditioning Condenser Bolts (Qty 2) CAUTION: Refer to Fastener Caution . Tighten: 9 N.m (80 lb in)
2Air Conditioning Condenser Tip: The air condition condenser is removed through the bottom.
CAUTION
Refer to Fastener Caution .

Scheme 16

Scheme 16: Heater and Air Conditioning Evaporator Module Replacement
Scheme 16: Heater and Air Conditioning Evaporator Module Replacement
CalloutComponent Name
Preliminary Procedures Recover the refrigerant. Refer to Refrigerant Recovery and Recharging . Remove the heater inlet hose from the heater core tube. Refer to Heater Inlet Hose Replacement (LF1) or Heater Inlet Hose Replacement (LAU) . Remove the heater outlet hose from the heater core tube. Refer to Heater Outlet Hose Replacement (LF1) or Heater Outlet Hose Replacement (LAU) . Remove the instrument panel tie bar. Refer to Instrument Panel Tie Bar Replacement .
1Heater and Air Conditioning Evaporator and Blower Module Fastener CAUTION: Refer to Fastener Caution . Procedure: With the aid of an assistant, remove the heater and air conditioning evaporator and blower module from the vehicle. Tighten: 1.4 N.m (12 lb in)
CAUTION
Refer to Fastener Caution .

Scheme 17

Scheme 17: Air Conditioning Evaporator Replacement
Scheme 17: Air Conditioning Evaporator Replacement
CalloutComponent Name
Preliminary Procedures Remove the heater and air conditioning evaporator and blower module. Refer to Heater and Air Conditioning Evaporator Module Replacement . Disconnect the heater and air conditioning evaporator and blower module assembly electrical connectors.
1Remove Heater Core Screw and Bracket CAUTION: Refer to Fastener Caution . Tighten: 2.5 N.m (23 lb in)
2Remove Heater Core retainer screw Procedure: Pull out the heater core. Tighten: 2.5 N.m (23 lb in)
3Heater and Blower and Air Conditioning Control Module Refer to Heater and Blower and Air Conditioning Control Module Replacement .
4A/C Evaporator Thermal Expansion Valve Fastener (Qty: 2) Tighten: 5 N.m (53 lb in)
5Air Conditioning Evaporator Thermal Expansion Valve Procedure: Remove and discard sealing washers.
6Heater and Air Conditioning Evaporator and Blower Module Case Screw (Qty: 11) Tighten: 1.5 N.m (9 lb in)
7Heater and Air Conditioning Evaporator and Blower Module Lower Case
8Air Conditioning Evaporator Core
CAUTION
Refer to Fastener Caution .

BOB 38185: Hose Clamp Pliers

For equivalent regional tools. Refer to Special Tools

  1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling - Vac-N-Fill(GE 47716)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system)
  2. Remove the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2)
  3. Disengage tension on the heater inlet hose clamp (1) at the engine using BOB 38185: Hose Clamp Pliers.
  4. Remove the heater inlet hose (2) from the engine.
  5. Release the clip from the quick disconnect (1) and remove the heater inlet hose (2) from the heater core tube.
  6. Remove the heater inlet hose from the vehicle.
  1. Install heater inlet hose to the vehicle.
  2. Install the heater inlet hose (2) to the heater core.
  3. Install the heater inlet hose (2) to the engine.
  4. Engage tension on the heater inlet hose clamp (1) at the engine using BOB 38185: Hose Clamp Pliers.
  5. Install the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2)
  6. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling - Vac-N-Fill(GE 47716)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system)

BOB 38185: Hose Clamp Pliers

For equivalent regional tools. Refer to Special Tools

  1. Drain the cooling system. Refer to «Cooling System Draining and Filling - Vac-N-Fill(GE 47716)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LAU)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system)
  2. Remove the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2)
  3. Disengage tension on the heater inlet hose clamp (1) at the engine using BOB 38185: Hose Clamp Pliers.
  4. Remove the heater inlet hose (2) from the engine.
  5. Release the clip from the quick disconnect (1) and remove the heater inlet hose (2) from the heater core tube.
  6. Remove the heater inlet hose from the vehicle.
  1. Install heater inlet hose to the vehicle.
  2. Install the heater inlet hose (2) to the heater core.
  3. Install the heater inlet hose (2) to the engine.
  4. Engage tension on the heater inlet hose clamp (1) at the engine using BOB 38185: Hose Clamp Pliers.
  5. Install the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2)
  6. Fill the cooling system. Refer to «Cooling System Draining and Filling - Vac-N-Fill(GE 47716)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LAU)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system)

BOB 38185: Hose Clamp Pliers

For equivalent regional tools. Refer to Special Tools

  1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling - Vac-N-Fill(GE 47716)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system)
  2. Remove the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2)
  3. Disengage tension on the heater outlet hose clamp (1) at the engine using BOB 38185: Hose Clamp Pliers.
  4. Remove the heater outlet hose (2) from the engine.
  5. Release the clip from the quick disconnect (1) and remove the heater outlet hose (2) from the heater core tube.
  6. Remove the heater outlet hose from the vehicle.
  1. Install heater outlet hose to the vehicle.
  2. Install the heater outlet hose (2) to the heater core.
  3. Install the heater outlet hose (2) to the engine.
  4. Engage tension on the heater outlet hose clamp (1) at the engine using BOB 38185: Hose Clamp Pliers.
  5. Install the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2)
  6. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LF1)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling - Vac-N-Fill (GE 47716)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system)

BOB 38185: Hose Clamp Pliers

For equivalent regional tools. Refer to Special Tools

  1. Drain the cooling system. Refer to «Cooling System Draining and Filling - Vac-N-Fill (GE 47716)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LAU)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system)
  2. Remove the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2)
  3. Disengage tension on the heater outlet hose clamp (1) at the engine using BOB 38185: Hose Clamp Pliers.
  4. Remove the heater outlet hose (2) from the engine.
  5. Release the clip from the quick disconnect (1) and remove the heater outlet hose (2) from the heater core tube.
  6. Remove the heater outlet hose from the vehicle.
  1. Install heater outlet hose to the vehicle.
  2. Install the heater outlet hose (2) to the heater core.
  3. Install the heater outlet hose (2) to the engine.
  4. Engage tension on the heater outlet hose clamp (1) at the engine using BOB 38185: Hose Clamp Pliers.
  5. Install the intake manifold cover. Refer to «Intake Manifold Cover Replacement»(/cadillac/srx/ii-2009-2012/remont/mechanical/#engine-mechanical-28l-or-30l-repair-instructions-on-vehicle-1-of-2)
  6. Fill the cooling system. Refer to «Cooling System Draining and Filling - Vac-N-Fill (GE 47716)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LAU)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system)

Scheme 18

Scheme 18: Heater Core Outlet Tube Replacement
Scheme 18: Heater Core Outlet Tube Replacement
CalloutComponent Name
Preliminary Procedure: Remove the heater and air conditioning evaporator case. Refer to Heater and Air Conditioning Evaporator Module Replacement .
1Heater Outlet Tube Boot
2Bracket Heater Core Outlet Tube Bolt CAUTION: Refer to Fastener Caution . Tighten: 2.5 N.m (23 lb in)
3Heater Core Outlet Tube Brace
4Heater Core Outlet Tube Clamp
5Heater Core Outlet Tube
CAUTION
Refer to Fastener Caution .

Scheme 19

Scheme 19: Heater Core Inlet Tube Replacement
Scheme 19: Heater Core Inlet Tube Replacement
CalloutComponent Name
Preliminary Procedure: Remove the heater and air conditioning evaporator case. Refer to Heater and Air Conditioning Evaporator Module Replacement .
1Heater Outlet Tube Boot
2Bracket Heater Core Inlet Tube Bolt CAUTION: Refer to Fastener Caution . Tighten: 2.5 N.m (23 lb in)
3Heater Core Outlet Tube Brace
4Heater Core Outlet Tube Clamp
5Heater Core Outlet Tube
CAUTION
Refer to Fastener Caution .

Scheme 20

Scheme 20: Heater Inlet Hose Connector Replacement (LF1)
Scheme 20: Heater Inlet Hose Connector Replacement (LF1)
CalloutComponent Name
Preliminary Procedures: Remove the heater inlet hose from heater core. Refer to Heater Outlet Hose Replacement (LF1)
1Heater Inlet Hose Connector Clamp Procedure: Reposition heater inlet hose connector clamp using BOB 38185: Hose Clamp Pliers. Special Tools: BOB 38185: Hose Clamp Pliers For equivalent regional tools. Refer to Special Tools
2Heater Inlet Hose Connector

Scheme 21

Scheme 21: Heater Inlet Hose Connector Replacement (LAU)
Scheme 21: Heater Inlet Hose Connector Replacement (LAU)
CalloutComponent Name
Preliminary Procedures: Remove the heater inlet hose from heater core. Refer to Heater Outlet Hose Replacement (LAU)
1Heater Inlet Hose Connector Clamp Procedure: Reposition heater inlet hose connector clamp using BOB 38185: Hose Clamp Pliers. Special Tools: BOB 38185: Hose Clamp Pliers For equivalent regional tools. Refer to Special Tools
2Heater Inlet Hose Connector

Scheme 22

Scheme 22: Heater Outlet Hose Connector Replacement (LF1)
Scheme 22: Heater Outlet Hose Connector Replacement (LF1)
CalloutComponent Name
Preliminary Procedures: Remove the heater outlet hose from heater core. Refer to Heater Outlet Hose Replacement (LF1)
1Heater Outlet Hose Connector Clamp Procedure: Reposition heater outlet hose connector clamp using BOB 38185: Hose Clamp Pliers. Special Tools: BOB 38185: Hose Clamp Pliers For equivalent regional tools. Refer to Special Tools
2Heater Outlet Hose Connector

Scheme 23

Scheme 23: Heater Outlet Hose Connector Replacement (LAU)
Scheme 23: Heater Outlet Hose Connector Replacement (LAU)
CalloutComponent Name
Preliminary Procedures: Remove the heater outlet hose from heater core. Refer to Heater Outlet Hose Replacement (LAU)
1Heater Outlet Hose Connector Clamp Procedure: Reposition heater outlet hose connector clamp using BOB 38185: Hose Clamp Pliers. Special Tools: BOB 38185: Hose Clamp Pliers For equivalent regional tools. Refer to Special Tools
2Heater Outlet Hose Connector

Scheme 24

Scheme 24: Passenger Compartment Air Filter Replacement
Scheme 24: Passenger Compartment Air Filter Replacement
CalloutComponent Name
Preliminary Procedure: Remove instrument panel compartment. Refer to Instrument Panel Compartment Replacement .
1Passenger Compartment Air Filter Service Lid Retainer (Qty: 3) Procedure: Release the retainer and open the service lid.
2Passenger Compartment Air Filter Lid
3Passenger Compartment Air Filter

Scheme 25

Scheme 25: Air Inlet Housing Replacement
Scheme 25: Air Inlet Housing Replacement
CalloutComponent Name
Preliminary Procedures Remove the Heater and Air Conditioning Evaporator and Blower Module. Refer to Heater and Air Conditioning Evaporator Module Replacement . Disconnect the electrical connectors as necessary.
1Air Inlet Housing Fastener (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten: 2.5 N.m (23 lb in)
2Air Inlet Housing
CAUTION
Refer to Fastener Caution .

Scheme 26

Scheme 26: Blower Motor Replacement
Scheme 26: Blower Motor Replacement
CalloutComponent Name
Preliminary Procedure Remove the instrument panel (I/P) insulator panel - right side. Refer to Instrument Panel Insulator Panel Replacement - Right Side . Disconnect the blower motor electrical connector.
1Blower Motor Fastener (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten: 1.7 N.m (15 lb in)
2Blower Motor
CAUTION
Refer to Fastener Caution .

Scheme 27

Scheme 27: Instrument Panel Outer Air Outlet Replacement - Left Side
Scheme 27: Instrument Panel Outer Air Outlet Replacement - Left Side
CalloutComponent Name
Preliminary Procedure: Remove the Instrument Panel Left Instrument Panel Side Trim Panel. Refer to Instrument Panel Side Trim Panel Replacement .
1Instrument Panel Outer Air Outlet Fastener CAUTION: Refer to Fastener Caution . Tighten: 2.5 N.m (22 lb in)
2Instrument Panel Outer Air Outlet Assembly Procedure Reach through the opening in the end of the instrument panel and depress the tabs on the bottom of the air outlet assembly. While depressing the tabs, pull the air outlet assembly outward releasing it from the instrument panel.
CAUTION
Refer to Fastener Caution .

Scheme 28

Scheme 28: Instrument Panel Center Air Outlet Replacement
Scheme 28: Instrument Panel Center Air Outlet Replacement
CalloutComponent Name
1Radio Control Assembly Refer to Radio Control Assembly Replacement
2Instrument Panel Center Air Outlet Assembly Procedure: Unsnap the air outlet assemblies from the radio control assembly.

Scheme 29

Scheme 29: Instrument Panel Outer Air Outlet Replacement - Right Side
Scheme 29: Instrument Panel Outer Air Outlet Replacement - Right Side
CalloutComponent Name
Preliminary Procedure: Remove the Instrument Panel Right Instrument Panel Side Trim Panel. Refer to Instrument Panel Side Trim Panel Replacement .
1Instrument Panel Outer Air Outlet Fastener CAUTION: Refer to Fastener Caution . Tighten: 2.5 N.m (22 lb in)
2Instrument Panel Outer Air Outlet Assembly Procedure Reach through the opening in the end of the instrument panel and depress the tabs on the bottom of the air outlet assembly. While depressing the tabs, pull the air outlet assembly outward releasing it from the instrument panel.
CAUTION
Refer to Fastener Caution .

Scheme 30

Scheme 30: Instrument Panel Compartment Air and Radio Cooling Duct Replacement
Scheme 30: Instrument Panel Compartment Air and Radio Cooling Duct Replacement
CalloutComponent Name
Preliminary Procedure Remove the radio control. Refer to Radio Control Assembly Replacement . Disconnect the blower motor electrical connector.
1Instrument Panel Compartment Air and Radio Cooling Duct Fastener (Qty: 2) CAUTION: Refer to Fastener Caution .
2Instrument Panel Compartment Air and Radio Cooling Duct
CAUTION
Refer to Fastener Caution .

Scheme 31

Scheme 31: Floor Front Air Outlet Duct Replacement
Scheme 31: Floor Front Air Outlet Duct Replacement
CalloutComponent Name
Preliminary Procedures: Remove the front floor console. Refer to Floor Front Air Outlet Duct Replacement .
1Front Floor Console Front Air Duct (Qty: 3) Disconnect and transfer sensor on left duct, if equipped.

Scheme 32

Scheme 32: Front Floor Console Rear Air Outlet Replacement
Scheme 32: Front Floor Console Rear Air Outlet Replacement
CalloutComponent Name
1Front Floor Console Upper Cover Refer to Front Floor Console Rear Trim Panel Replacement - Upper .
2Front Floor Console Rear Air Outlet Assembly Procedure: Unsnap the rear air outlet assembly from the front floor console upper rear cover.

Scheme 33

Scheme 33: Windshield Defroster Nozzle Grille Replacement
Scheme 33: Windshield Defroster Nozzle Grille Replacement
CalloutComponent Name
1Windshield Defroster Nozzle Grille Assembly Procedure Use a flat bladed plastic trim tool in order to release the retainer clips securing the windshield defroster nozzle grille to the instrument panel assembly. When reinstalling the defroster nozzle grille start the installation at the left side of the vehicle and work to the right side of the vehicle. Do not begin the installation from the center.

Scheme 34

Scheme 34: Windshield Defroster Nozzle Duct Replacement
Scheme 34: Windshield Defroster Nozzle Duct Replacement
CalloutComponent Name
Preliminary Procedure Remove the instrument panel assembly. Refer to Instrument Panel Assembly Removal . Remove the air distributor duct. Refer to Air Distributor Duct Replacement
1Windshield Defroster Nozzle Duct Fasteners (Qty: 8) CAUTION: Refer to Fastener Caution .
2Windshield Defroster Nozzle Duct
CAUTION
Refer to Fastener Caution .

Scheme 35

Scheme 35: Air Distributor Duct Replacement
Scheme 35: Air Distributor Duct Replacement
CalloutComponent Name
Preliminary Procedures Remove the Instrument panel assembly. Refer to Instrument Panel Assembly Removal . Reposition any wiring or hoses to gain access to air duct.
1Air Distributor Duct Screw (Qty: 6) Tighten: 1.5 N.m (13.2 lb in)
2Air Distributor Duct

Scheme 36

Scheme 36: Side Window Defogger Outlet Duct Replacement - Left Side
Scheme 36: Side Window Defogger Outlet Duct Replacement - Left Side
CalloutComponent Name
Preliminary Procedure: Remove the instrument panel assembly. Refer to Instrument Panel Assembly Removal .
1Side Window Defogger Outlet Duct-Left Procedure Remove the Windshield Defroster Nozzle Duct Replacement. Refer to Windshield Defroster Nozzle Duct Replacement Remove the Side Window Defogger Outlet Duct-Left. Remove the Side Window Defogger Outlet Duct from vehicle.

Scheme 37

Scheme 37: Side Window Defogger Outlet Duct Replacement - Right Side
Scheme 37: Side Window Defogger Outlet Duct Replacement - Right Side
CalloutComponent Name
Preliminary Procedure: Remove the instrument panel assembly. Refer to Instrument Panel Assembly Removal .
1Side Window Defogger Outlet Duct-Rightt Procedure Remove the Windshield Defroster Nozzle Duct Replacement. Refer to Windshield Defroster Nozzle Duct Replacement Remove the Side Window Defogger Outlet Duct-Right. Remove the Side Window Defogger Outlet Duct from vehicle.

Scheme 38

Scheme 38: Floor Air Outlet Duct Replacement - Left Side
Scheme 38: Floor Air Outlet Duct Replacement - Left Side
CalloutComponent Name
Preliminary Procedures Remove the instrument panel insulator panel - left side. Refer to Instrument Panel Insulator Panel Replacement - Left Side . Remove the instrument panel lower trim panel. Refer to Instrument Panel Lower Trim Panel Replacement - Left Side .
1Floor Air Outlet Duct Retainer (Qty: 4)
2Floor Air Outlet Duct

Scheme 39

Scheme 39: Floor Air Outlet Duct Replacement - Right Side
Scheme 39: Floor Air Outlet Duct Replacement - Right Side
CalloutComponent Name
Preliminary Procedures: Remove the instrument panel compartment. Refer to Instrument Panel Compartment Replacement .
1Remove fasteners (4)
2Floor Air Outlet Duct

Scheme 40

Scheme 40: Floor Rear Air Outlet Duct Replacement - Left Side
Scheme 40: Floor Rear Air Outlet Duct Replacement - Left Side
CalloutComponent Name
Preliminary Procedures: Remove the front floor carpet. Refer to Front Floor Panel Carpet Replacement .
1Front Floor Air Outlet Duct
2Rear Floor Air Outlet Duct

Scheme 41

Scheme 41: Floor Rear Air Outlet Duct Replacement - Right Side
Scheme 41: Floor Rear Air Outlet Duct Replacement - Right Side
CalloutComponent Name
Preliminary Procedures: Remove the front floor carpet. Refer to Front Floor Panel Carpet Replacement .
1Front Floor Air Outlet Duct
2Rear Floor Air Outlet Duct

Scheme 42

Scheme 42: Heater Core Replacement
Scheme 42: Heater Core Replacement
CalloutComponent Name
Preliminary Procedure Remove the instrument panel (I/P) insulator panel - left side. Refer to Instrument Panel Insulator Panel Replacement - Left Side . Remove the instrument panel (I/P) lower trim panel. Refer to Instrument Panel Lower Trim Panel Replacement - Left Side . Remove the heater inlet hose from the heater core tube. Refer to Heater Inlet Hose Replacement (LF1) or Heater Inlet Hose Replacement (LAU) . Remove the heater outlet hose from the heater core tube. Refer to Heater Outlet Hose Replacement (LF1) or Heater Outlet Hose Replacement (LAU) .
1Heater Core Tube Clamp (Qty: 2)
2Heater Core Tube Assembly Tip: Coolant may still be in the heater core, collect coolant or blow out heater core with compressed air.
3Heater Core Tube Seal (Qty: 2)
4Heater Core Bracket Fastener CAUTION: Refer to Fastener Caution . Tighten: 1.4 N.m (12 lb in)
5Heater Core Procedure: Pull out the heater core.
CAUTION
Refer to Fastener Caution .

Scheme 43

Scheme 43: Auxiliary Blower Motor Replacement
Scheme 43: Auxiliary Blower Motor Replacement
CalloutComponent Name
Preliminary Procedure Remove the Floor console. Refer to Front Floor Console Replacement . Disconnect all electrical connector. Remove front floor air outlet duct. Refer to Floor Front Air Outlet Duct Replacement Remove the blower motor bracket fastener at bottom of blower assembly.
1Auxilliary Blower Motor Fastener (Qty: 9) CAUTION: Refer to Fastener Caution . Tighten: 2.5 N.m (23 lb in)
2Auxilliary Blower Motor
CAUTION
Refer to Fastener Caution .

Illustration Tool Number/Description BOB 38185 J 38185 Hose Clamp Pliers GE 41447 J 41447 R-134a A/C Tracer Dye - Box of 24 GE 42220 J 42220 Universal 12V Leak Detection Lamp GE 8800 J 43600 ACR 2000 Air Conditioning Service Center GE 43872 J 43872 Fluorescent Dye Cleaner GE 44551 J 44551 Suction Screen Installation/Removal Kit GE 45037 J 45037 A/C Oil Injector GE 45268 J 45268 A/C Flushing Adapter Kit GE 50078 Electronic Leak Detector J 46246 Charge Port Valve Core Remover/Installer J 46297 A/C Dye Injector Kit GE 46297-12 J 46297-12 Replacement Dye Cartridges 7000086I Scan Tool Used for diagnosis of vehicle electrical system

Scheme 44

Scheme 44: Special Tools
Scheme 44: Special Tools

Scheme 45

Scheme 45
Scheme 45

Scheme 46

Scheme 46
Scheme 46

Scheme 47

Scheme 47
Scheme 47

Scheme 48

Scheme 48
Scheme 48

Scheme 49

Scheme 49
Scheme 49

Scheme 50

Scheme 50
Scheme 50

Scheme 51

Scheme 51
Scheme 51

Scheme 52

Scheme 52
Scheme 52

Scheme 53

Scheme 53
Scheme 53

See also:
• Symptoms - HVAC Systems - Automatic
• Moving Parts and Hot Surfaces Warning
• Air Temperature Malfunction
• Cooling Fan Description and Operation (LAU)
• Cooling Fan Description and Operation (LF1)
• Diagnostic System Check - Vehicle
• Diagnostic Starting Point - Vehicle
• Drive Belt Falls Off and Excessive Wear Diagnosis
• Drive Belt Tensioner Diagnosis
• Drive Belt Replacement
• Vibration Analysis - Engine
• Instrument Panel Tie Bar Replacement
• Loss of Coolant
• Oil Leak Diagnosis
• Power Steering Fluid Leaks
• Afterblow Enabling
• Fastener Caution
• Lifting and Jacking the Vehicle
• Front Wheelhouse Liner Replacement
• Air Cleaner Assembly Replacement (LF1)
• Radiator Air Lower Deflector Replacement
• Radio Control Assembly Replacement
• Front Floor Panel Carpet Replacement
• Refrigerant Recovery and Recharging
• Air Conditioning (A/C) Diagnostics - Pressure Zone A
• Refrigerant System Specifications
• Heating Performance Diagnostic
• Air Conditioning Compressor Oil Diagnosis

More articles — HVAC