Heating, Ventilation, and Air Conditioning Cadillac ATS I

Fastener Tightening Specifications

Fastener Tightening Specifications

Adhesives, Fluids, Lubricants, and Sealers

Adhesives, Fluids, Lubricants, and Sealers

Refrigerant System Specifications

Refrigerant System Capacities

Handling of Refrigerant Lines and Fittings

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.

Note. The following steps must be completed before using the symptom tables.

1. Perform the «Diagnostic Starting Point - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-starting-point-vehicle) before using the symptom tables in order to verify that all of the following are true: There are no DTCs set The control modules can communicate via the serial data link
2. Review the system operation in order to familiarize yourself with the system functions. Refer to «Symptoms - HVAC Systems - Automatic»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#hvac-system-automatic__symptoms-hvac-systems-automatic) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the HVAC System. Refer to «Checking Aftermarket Accessories»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
3. Verify the A/C compressor clutch turns freely and is not seized.
4. The A/C compressor will not operate in cold outside air temperatures .
5. The following could cause window fogging: Wet carpet or mats High humidity Interior water leak Blocked A/C evaporator drain tube Maximum passenger capacity Blocked body pressure relief valves
6. Inspect the air distribution system for causes of reduced air flow: Obstructed or dirty passenger compartment air filter, if equipped Blocked or damaged air inlet or outlet vents

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «Leak Testing»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__leak-testing)
2. «Noise Diagnosis - HVAC Module»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__noise-diagnosis-hvac-module)
3. «Noise Diagnosis - Air Conditioning (A/C) System»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__noise-diagnosis-air-conditioning-ac)
4. «Noise Diagnosis - Blower Motor»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__noise-diagnosis-blower-motor)
5. «Odor Diagnosis»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__odor-diagnosis)

Leak Testing

Special Tools

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

For equivalent regional tools. Refer to Special Tools .

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 GE-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 GE-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 GE-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 GE-43872 Fluorescent Dye Cleaner.

Halogen Leak Detector

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 (R-134a) 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 GE-39400-A Halogen Leak Detector.

Air Conditioning (A/C) System Performance Test (LFX, LTG)

Technicians repairing or servicing motor vehicle air conditioning (MVAC) must be trained and certified by an EPA approved organization. Certification is obtained by passing an EPA approved examination. (http://www.epa.gov/ozone/title6/609/technicians/609certs.html).

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

Test Description

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.

Air Conditioning (A/C) System Performance Test (LFX, LTG)

A/C Performance Table

Air Conditioning (A/C) System Performance Test (LCV)

Technicians repairing or servicing motor vehicle air conditioning (MVAC) must be trained and certified by an EPA approved organization. Certification is obtained by passing an EPA approved examination. (http://www.epa.gov/ozone/title6/609/technicians/609certs.html).

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

Test Description

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.

Air Conditioning (A/C) System Performance Test (LCV)

A/C Performance Table

A/C Diagnostics Chart

A/C Diagnostics Chart

Heating Performance Diagnostic

Heating Performance Diagnostic

Defrosting Insufficient

Defrosting Insufficient

Noise Diagnosis - Blower Motor

Noise Diagnosis - Blower Motor

Air Conditioning Compressor Oil Diagnosis

Air Conditioning Compressor Oil Diagnosis

Noise Diagnosis - Air Conditioning (A/C) System

Noise Diagnosis - Air Conditioning (A/C) System

Noise Diagnosis - HVAC Module

Noise Diagnosis - HVAC Module

Odor Diagnosis

Odor Diagnosis

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/ats/i-2012-2014/remont/automatic-hvac-system/#hvac-system-automatic__afterblow-enabling) .

Refrigerant Recovery and Recharging (R-134a)

Special Tools

1. GE-48800 CoolTech A/C Recharge Machine
2. J-43600 ACR 2000 Air Conditioning Service Center
3. J-45037 A/C Oil Injector

For equivalent regional tools, refer to Special Tools

Both the J-43600 ACR 2000 Air Conditioning Service Center and GE-48800 CoolTech A/C Recharge Machine are complete air conditioning service center for R-134a. Both units recovers, recycles, evacuates and recharges A/C refrigerant quickly, accurately and automatically. Both units have 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. Both units 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.

GE-48800 CoolTech A/C Recharge Machine is released as a required replacement for the previously essential J-43600 ACR 2000 Air Conditioning Service Center. The GE-48800 CoolTech A/C Recharge Machine is SAE J2788 compliant and meets GM requirements for A/C Refrigerant System Repairs on all General Motors vehicles, including Hybrid systems with Polyolester (POE) refrigerant oil.

Refer to the J-43600 ACR 2000 Air Conditioning Service Center or GE-48800 CoolTech A/C Recharge Machine manual for operation and setup instruction. Always recharge the A/C System with the proper amount of R-134a. Refer to Refrigerant System Specifications for the correct amount.

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 same quantity of PAG oil must be replenished. If no oil was removed from the A/C system during recovery, do not charge any PAG oil into the A/C system. Oil can be injected into a charged system using J-45037 A/C Oil Injector. For the proper quantities of oil to add to the A/C refrigerant system, refer to Refrigerant System Specifications .

Flushing (R-134a)

Special Tools

1. GE-41447 A/C Tracer Dye - Box of 24
2. GE-45268 A/C Flushing Adapter Kit
3. GE-48800 CoolTech A/C Recharge Machine
4. GE-50078 Enhanced Leak Detector

For equivalent regional tools, refer to Special Tools .

General Information

Note. Flushing is not intended to remove metal from the A/C system.

Flushing is intended to remove the following

1. Contaminated A/C Compressor oil
2. Desiccant, following a desiccant bag failure
3. Overcharge of A/C Compressor oil
4. Refrigerant contamination

Note. Warmer engine or ambient temperatures decreases the refrigerant recovery time during the A/C flush procedure.

Forward Flushing Setup

1. Install both GE-45268-9 (2) onto the GE-45268-10 (3).
2. Install the GE-45268-7 (4) onto the suction side of the GE-45268-10 (3).
3. Install the GE-45268-8 (1) onto the discharge side of the GE-45268-10 (3).

Reverse Flushing Setup

1. Install both GE-45268-9 (2) onto the GE-45268-10 (3).
2. Install the GE-45268-8 (4) onto the suction side of the GE-45268-10 (3).
3. Install the GE-45268-7 (1) onto the discharge side of the GE-45268-10 (3).

Flush Procedure

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
2. Remove the thermal expansion valve (TXV). Refer to «Air Conditioning Evaporator Thermal Expansion Valve Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Air Conditioning Evaporator Thermal Expansion Valve Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Air Conditioning Evaporator Thermal Expansion Valve Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
3. Install the TXV stud onto the GE-45268-115 adapter.
4. Install new sealing washers onto the evaporator core. Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
5. Install GE-45268-115 in place of the TXV.
6. Install TXV mounting bolts and tighten to 5 (44 lb in).
7. Install new washers onto the liquid line and suction hose. Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
8. Connect the liquid line and suction hose to the GE-45268-115.
9. Install the TXV block fitting nut and tighten to 22 (16 lb ft).
10. Remove the A/C compressor. Refer to «Air Conditioning Compressor Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Air Conditioning Compressor Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Air Conditioning Compressor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
11. Service the filter before each flush.
12. Install the GE-45268-10 to the A/C compressor to condenser hose assembly.
13. Connect the GE-45268-1 filter to GE-45268-7 adapter.
14. Connect the blue hose from the GE-48800 CoolTech A/C Recharge Machine to GE-45268-1 flush filter adapter.
15. Connect the red hose from the GE-48800 CoolTech A/C Recharge Machine to fitting GE-45268-8.
16. Flush the A/C system. Follow the instructions supplied with the GE-48800 Air Conditioning Service Center.
17. Disconnect the red hose from the GE-48800 CoolTech A/C Recharge Machine from GE-45268-8.
18. Disconnect the blue hose from the GE-48800 CoolTech A/C Recharge Machine to GE-45268-1 flush filter adapter.
19. Disconnect the GE-45268-1 flush filter from the GE-45268-10 flush adapter.
20. Remove the GE-45268-10 from the A/C compressor hose assembly.
21. 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 and tighten to 30 (22 lb ft). Add the total system capacity of PAG oil to the A/C compressor. Refer to «Refrigerant System Specifications»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-specifications) .
22. If you will replace the A/C compressor after flushing the system, perform the following procedure: Deduct 41 ml (1.4 oz), which is 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/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-specifications) . Add the calculated amount to the compressor, as needed.
23. Add one bottle of GE-41447 R-134A A/C Tracer Dye directly to the A/C Compressor.
24. Install the A/C compressor. Refer to «Air Conditioning Compressor Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Air Conditioning Compressor Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Air Conditioning Compressor Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
25. Remove the TXV block fitting nut.
26. Disconnect the liquid line and suction hose from the GE-45268-115.
27. Remove the TXV bolts retaining the GE-45268-115.
28. Remove the GE-45268-115.
29. Inspect the TXV for debris. Clean or replace as needed.
30. Install the TXV. Refer to «Air Conditioning Evaporator Thermal Expansion Valve Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Air Conditioning Evaporator Thermal Expansion Valve Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Air Conditioning Evaporator Thermal Expansion Valve Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
31. Evacuate and recharge the A/C system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
32. Leak test the fittings using GE-50078 Enhanced Leak Detector.

Draining Procedure

1. Remove the compressor crankcase oil drain plug from the removed compressor and drain the refrigerant oil from the crankcase into a clean, graduated container.
2. Drain the oil from both the suction and discharge ports into the same container. Rotate the compressor shaft to assist in draining the compressor.
3. Measure and record the amount of oil drained from the removed compressor. In addition, measure and record the amount of oil recovered during refrigerant recovery. 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/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-compressor-oil-diagnosis) .
5. Properly discard the used refrigerant oil.

Balancing Procedure

Note. The refrigerant oil in the A/C system must be balanced during compressor replacement.

Note. Check the oil volume in the replacement compressor.

The replacement compressor is shipped partially filled with refrigerant oil. The amount of oil has to be balanced according to below

1. Refer to the amounts of refrigerant oil recorded during the compressor removal and refrigerant recovery.
2. If the sum of the amount of oil drained from the removed compressor and the amount of oil removed during refrigerant recovery is: Less than 41 ml (1.4 oz), no balancing is required. Install the replacement compressor as is. It contains 41 ml (1.4 oz) of oil. More than 41 ml (1.4 oz), additional oil is required. Subtract 41 ml (1.4 oz) from the sum of removed oil (oil drained + oil recovered). This calculated difference is the amount of service PAG oil that needs to be added to the replacement compressor. Add the additional oil needed and install the replacement compressor.

Scheme 1

Air Conditioning Compressor Replacement (LFX)

Scheme 2

Air Conditioning Compressor Replacement (LCV)

Scheme 3

Air Conditioning Compressor Replacement (LTG)

Scheme 4

Air Conditioning Clutch Assembly Replacement (LCV, LFX, LTG)

Air Conditioning Clutch Drive Plate Adjustment

1. Install the air conditioning clutch plate assembly (2).
2. Measure the air gap between the pulley and the drive plate. Adjust the shims (3) to achieve a 0.30-0.60 mm (0.011-0.023 in) air gap.
3. Install the air conditioning compressor clutch pulley bolt (1) and tighten to 18 N.m (13 lb ft).

Scheme 5

Air Conditioning Compressor Bracket Replacement (LFX)

Removal Procedure

1. Disassemble the A/C refrigerant components. Refer to the appropriate repair procedure.
2. Cap or tape the A/C refrigerant components.
3. Remove the sealing washer (1) from the A/C refrigerant component.
4. Inspect the seal washer for signs of damage to help determine the root cause of the failure.
5. Inspect the A/C refrigerant components for damage or burrs. Repair if necessary.
6. DISCARD the sealing washer.

Installation Procedure

1. Inspect the new sealing washer for any signs of cracks, cuts, or damage. Do not use a damaged sealing washer.
2. Remove the cap or tape from the A/C refrigerant components.
3. Using a lint-free clean, dry cloth, clean the sealing surfaces of the A/C refrigerant components.
4. Carefully install the NEW sealing washer (1) onto the A/C refrigerant component. The sealing washer (1) 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
2. Cap or tape the A/C refrigerant components.
3. Remove the O-ring seal (1) from the A/C refrigerant component.
4. Inspect the O-ring seal for signs of damage to help determine the root cause of the failure.
5. Inspect the A/C refrigerant components for damage or burrs. Repair if necessary.
6. DISCARD the O-ring seal.

1. Inspect the new O-ring seal for any sign of cracks, cuts, or damage.
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 (1) onto the A/C refrigerant component.
6. The O-ring seal (1) must be fully seated.
7. Assemble the A/C components. Refer to the appropriate repair procedure.

1. Recover the air conditioning system refrigerant. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
2. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-36l-lfx-repair-instructions) .
3. Remove the air conditioning compressor hose nut (1)
4. Remove the air conditioning compressor and condenser hose (2) from air conditioning evaporator hose joint.
5. Remove and discard the sealing washer (3).
6. Remove the air conditioning compressor and condenser hose bolt (1) at the compressor.
7. Remove the air conditioning compressor and condenser hose (2) from the compressor.
8. Remove and discard the sealing washers (3).
9. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/ats/i-2012-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
10. Remove the left front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement»(/cadillac/ats/i-2012-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
11. Remove the air conditioning compressor and condenser hose nut (1) at the condenser.
12. Remove the air conditioning compressor and condenser hose (2) from the condenser.
13. Remove and discard the sealing washer (3) and replace with NEW sealing washers.
14. Remove the air conditioning compressor and condenser hose (1) from vehicle.

1. Install the air conditioning compressor and condenser hose to the vehicle.
2. Install NEW sealing washers (3) to the air conditioning compressor and condenser hose (2). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
3. Install the air conditioning compressor and condenser hose (2) to the condenser.
4. Install the air conditioning compressor and condenser hose nut (1) at the condenser and tighten to 22 N.m (16 lb ft).
5. Install the left front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement»(/cadillac/ats/i-2012-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
6. Lower the vehicle.
7. Install NEW sealing washers (3) to the air conditioning compressor and condenser hose (2). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) . Install the air conditioning compressor and condenser hose (2) to the compressor.
8. Install the air conditioning compressor and condenser hose bolt (1) at compressor and tighten to 22 N.m (16 lb ft).
9. Install NEW sealing washers (3) to the air conditioning compressor and condenser hose (2). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) . Install the air conditioning compressor and condenser hose (2) to the air conditioning evaporator hose joint.
10. Install the air conditioning compressor and condenser nut (1) to air conditioning evaporator hose (2) and tighten to 22 N.m (16 lb ft).
11. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-36l-lfx-repair-instructions) .
12. Evacuate and charge the A/C system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .

1. Recover the air conditioning system refrigerant. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
2. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-36l-lfx-repair-instructions) .
3. Remove the air conditioning compressor and condenser hose nut (1)
4. Remove the air conditioning compressor and condenser hose (2) from air conditioning evaporator hose joint.
5. Remove and discard the sealing washer (3).
6. Remove the air conditioning compressor and condenser hose bolt (1) at the compressor.
7. Remove the air conditioning compressor and condenser hose (2) from the compressor.
8. Remove and discard the sealing washers (3).
9. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/ats/i-2012-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
10. Remove the left front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement»(/cadillac/ats/i-2012-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
11. Remove the air conditioning compressor and condenser hose nut (1) at the condenser.
12. Remove the air conditioning compressor and condenser hose (2) from the condenser.
13. Remove and discard the sealing washer (3).
14. Lower the vehicle.
15. Remove the air conditioning compressor and condenser hose (1) from vehicle.

1. Install the air conditioning compressor and condenser hose to the vehicle.
2. Install NEW sealing washer (3) to the air conditioning compressor and condenser hose (2). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/ats/i-2012-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
4. Install the air conditioning compressor and condenser hose (2) to the condenser.
5. Install the air conditioning compressor and condenser hose nut (1) at the condenser and tighten to 22 N.m (16 lb ft).
6. Install the left front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement»(/cadillac/ats/i-2012-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
7. Lower the vehicle.
8. Install NEW sealing washers (3) to the air conditioning compressor hose (2). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) . Install the air conditioning compressor and condenser hose (2) to the compressor.
9. Install the air conditioning compressor and condenser hose bolt (1) at compressor and tighten to 22 N.m (16 lb ft).
10. Install NEW sealing washer (3) to the air conditioning compressor and condenser hose (2). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) . Install the air conditioning compressor and condenser hose (2) to the air conditioning evaporator hose joint.
11. Install the air conditioning compressor and condenser hose nut (1) to air conditioning evaporator hose (2) and tighten to 22 N.m (16 lb ft).
12. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-36l-lfx-repair-instructions) .
13. Evacuate and charge the air conditioning system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .

1. Recover the air conditioning system refrigerant. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
3. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
4. Remove the charge air cooler inlet air tube. Refer to «Charge Air Cooler Inlet Air Tube Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
5. Remove the turbocharger heat shield. Refer to «Turbocharger Heat Shield Replacement»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-on-vehicle) .
6. Remove the air conditioning compressor and condenser hose nut (1) from the air conditioning evaporator hose.
7. Remove the air conditioning compressor and condenser hose (2) from air conditioning evaporator hose.
8. Remove and discard the sealing washer (3).
9. Remove the air conditioning compressor and condenser hose bolt (1) from the compressor.
10. Remove the air conditioning compressor and condenser hose (2) from the compressor.
11. Remove and discard the sealing washers (3).
12. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/ats/i-2012-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
13. Remove the left front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement»(/cadillac/ats/i-2012-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
14. Remove the air conditioning compressor and condenser hose nut (1) from the condenser.
15. Disconnect the refrigerant pressure sensor electrical connector.
16. Remove the air conditioning compressor and condenser hose (2) from the condenser.
17. Remove and discard the sealing washer (3).
18. Lower the vehicle.
19. Remove the air conditioning compressor and condenser hose (1) from vehicle.

1. Install the air conditioning compressor and condenser hose to the vehicle.
2. Install NEW sealing washer (3) to the air conditioning compressor and condenser hose (2). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/ats/i-2012-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
4. Install the air conditioning compressor and condenser hose (2) to the condenser.
5. Install the air conditioning compressor and condenser hose nut (1) to the condenser and tighten to 22 N.m (16 lb ft).
6. Connect the refrigerant pressure sensor electrical connector.
7. Install the left front wheelhouse liner. Refer to «Front Wheelhouse Liner Replacement»(/cadillac/ats/i-2012-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
8. Lower the vehicle.
9. Install NEW sealing washers (3) to the air conditioning compressor hose (2). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) . Install the air conditioning compressor and condenser hose (2) to the compressor.
10. Install the air conditioning compressor and condenser hose bolt (1) to the compressor and tighten to 22 N.m (16 lb ft).
11. Install NEW sealing washer (3) to the air conditioning compressor and condenser hose (2). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) . Install the air conditioning compressor and condenser hose (2) to the air conditioning evaporator hose.
12. Install the air conditioning compressor and condenser hose nut (1) to air conditioning evaporator hose (2) and tighten to 22 N.m (16 lb ft).
13. Install the turbocharger heat shield. Refer to «Turbocharger Heat Shield Replacement»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-on-vehicle) .
14. Install the charge air cooler inlet air tube. Refer to «Charge Air Cooler Inlet Air Tube Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
15. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
16. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
17. Evacuate and charge the air conditioning system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .

Scheme 6

Air Conditioning Evaporator Hose Assembly Replacement

Scheme 7

Air Conditioning Evaporator Tube Cover Replacement

Air Conditioning Refrigerant Service Valve Core Replacement

Special Tools

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 (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
2. Using the GE 46246 Valve Core Tool , remove the valve core (1) from the service port.

1. Install the valve core (1) to the service port.
2. Using the GE 46246 Valve Core Tool , tighten the valve core.
3. Evacuate and recharge the A/C system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
4. Leak test the fittings of the component using GE 50078 Electronic Leak Detector.

Scheme 8

Air Conditioning Refrigerant Desiccant Replacement

Scheme 9

Air Conditioning Evaporator Thermal Expansion Valve Replacement (LFX)

Scheme 10

Air Conditioning Evaporator Thermal Expansion Valve Replacement (LCV)

Scheme 11

Air Conditioning Evaporator Thermal Expansion Valve Replacement (LTG)

Scheme 12

Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LCV, LFX)

Scheme 13

Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LTG)

Scheme 14

Air Conditioning Condenser Replacement (LCV with MYA, V03, KC4)

Scheme 15

Air Conditioning Condenser Replacement (LTG with M3L, V03)

1. Recover the air conditioning system refrigerant. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
3. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
4. Remove the radiator upper brackets (2). Refer to «Radiator Upper Bracket Replacement»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Remove the front bumper impact bar. Refer to «Front Bumper Impact Bar Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-body-panels/#bumpers-and-fascias) .
6. Remove the front bumper fascia center support and the forward range radar module if equipped. Refer to «Forward Range Radar Module Replacement»(/cadillac/ats/i-2012-2014/remont/collisionavoidance/#object-detection-system-park-assist-system) , or «Front Bumper Fascia Center Support Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-body-panels/#bumpers-and-fascias) .
7. Reposition the electrical harness out of the way.
8. Remove the front bumper fascia upper support. Refer to «Front Bumper Fascia Upper Support Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-body-panels/#bumpers-and-fascias) .
9. Place a drain pan under the transmission fluid cooler pipe and the transmission fluid cooler inlet and outlet pipe, if equipped with an auxiliary transmission cooler.
10. Disconnect the transmission fluid cooler pipe retaining ring (1) from the air conditioning condenser, if equipped with an auxiliary transmission cooler. Refer to «Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle__transmission-fluid-cooler-hosepipe-quick-connect-fitting) .
11. Disconnect the transmission fluid cooler pipe (2) from the air conditioning condenser.
12. Disconnect the transmission fluid cooler inlet and outlet pipe retaining ring (1) from the air conditioning condenser, if equipped with an auxiliary transmission cooler. Refer to «Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle__transmission-fluid-cooler-hosepipe-quick-connect-fitting) .
13. Disconnect the transmission fluid cooler inlet and outlet pipe (2) from the air conditioning condenser.
14. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/ats/i-2012-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
15. Remove the air conditioning compressor and condenser hose nut (1) from the air conditioning condenser.
16. Remove the air conditioning compressor and condenser hose (2) from air conditioning condenser.
17. Remove and discard the sealing washer (3).
18. Remove air conditioning condenser outlet tube nut (3) from the condenser.
19. Remove air conditioning condenser outlet tube (5) from the condenser.
20. Remove and discard the sealing washer (4).
21. Lower the drivetrain and front suspension frame enough to access the air conditioning condenser outlet tube to radiator mounting bolt. Refer to «Drivetrain and Front Suspension Frame Removal and Installation»(/cadillac/ats/i-2012-2014/remont/frames-subframes-crossmembers/#frame-and-underbody__drivetrain-and-front-suspension-frame-removal) .
22. Remove the air conditioning condenser outlet tube to radiator mounting bolt (2).
23. Remove the hood latch mounting bolts and reposition the hood latch out of the way. Refer to «Hood Primary and Secondary Latch Replacement»(/cadillac/ats/i-2012-2014/remont/exteriorinterior-trim/#bolted-exterior-body-panels-and-closures) .
24. Remove the upper air baffle and deflector retainers. Refer to «Radiator Air Upper Baffle and Deflector Replacement»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
25. Remove the radiator air lower baffle and deflector side retainers from the radiator and charge air cooler. Refer to «Radiator Air Lower Baffle and Deflector Replacement (LCV, LFX)»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
26. Reposition the radiator air lower baffle away from the condenser and radiator.
27. Remove and discard the sealing washer (4).
28. Remove the air conditioning condenser bolts (1) from the radiator.
29. Remove the air conditioning condenser (2) from the radiator.

1. Install the air conditioning condenser (2) to the radiator.
2. Install the air conditioning condenser bolts (1) to the radiator and tighten.
3. Install NEW sealing washer (3) to the air conditioning condenser outlet tube (5). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
4. Install the radiator air lower baffle and deflector side retainers to the radiator and charge air cooler. Refer to «Radiator Air Lower Baffle and Deflector Replacement (LCV, LFX)»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Install the upper air baffle and deflector retainers. Refer to «Radiator Air Upper Baffle and Deflector Replacement»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Install the hood latch. Refer to «Hood Primary and Secondary Latch Replacement»(/cadillac/ats/i-2012-2014/remont/exteriorinterior-trim/#bolted-exterior-body-panels-and-closures) .
7. Install the air conditioning condenser outlet tube to radiator mounting bolt (2).
8. Install the drivetrain and front suspension frame. Refer to «Drivetrain and Front Suspension Frame Removal and Installation»(/cadillac/ats/i-2012-2014/remont/frames-subframes-crossmembers/#frame-and-underbody__drivetrain-and-front-suspension-frame-removal) .
9. Install the air conditioning condenser outlet tube (5) to the condenser.
10. Install the air conditioning condenser outlet tube nut (3) to the condenser and tighten to 22 N.m (16 lb ft).
11. Install NEW sealing washer (3) to the air conditioning compressor and condenser hose (2). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
12. Install the air conditioning compressor and condenser hose (2) to the air conditioning condenser.
13. Install the air conditioning compressor and condenser hose nut (1) to the air conditioning condenser and tighten to 22 N.m (16 lb ft).
14. Lower the vehicle.
15. Connect the transmission fluid cooler inlet and outlet pipe (2) to the air conditioning condenser, if equipped with an auxiliary transmission cooler. Refer to «Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle__transmission-fluid-cooler-hosepipe-quick-connect-fitting) .
16. Connect the transmission fluid cooler pipe (2) to the air conditioning condenser, if equipped with an auxiliary transmission cooler. Refer to «Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle__transmission-fluid-cooler-hosepipe-quick-connect-fitting) .
17. Install the front bumper fascia center support and the forward range radar module if equipped. Refer to «Forward Range Radar Module Replacement»(/cadillac/ats/i-2012-2014/remont/collisionavoidance/#object-detection-system-park-assist-system) , or «Front Bumper Fascia Center Support Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-body-panels/#bumpers-and-fascias) .
18. Install the front bumper fascia upper support. Refer to «Front Bumper Fascia Upper Support Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-body-panels/#bumpers-and-fascias) .
19. Install the front bumper impact bar. Refer to «Front Bumper Impact Bar Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-body-panels/#bumpers-and-fascias) .
20. Install the radiator upper brackets (2). Refer to «Radiator Upper Bracket Replacement»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
21. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
22. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
23. Evacuate and charge the air conditioning system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
24. Inspect the transmission fluid level. Refer to «Transmission Fluid Fill Procedure»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-fill-procedure) .
25. Inspect for transmission fluid leaks. Refer to «Automatic Transmission Fluid Leaks»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__automatic-transmission-fluid-leaks) .

1. Recover the air conditioning system refrigerant. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
3. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
4. Remove the radiator upper brackets (2). Refer to «Radiator Upper Bracket Replacement»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Remove the front bumper impact bar. Refer to «Front Bumper Impact Bar Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-body-panels/#bumpers-and-fascias) .
6. Remove the front bumper fascia center support and the forward range radar module if equipped. Refer to «Forward Range Radar Module Replacement»(/cadillac/ats/i-2012-2014/remont/collisionavoidance/#object-detection-system-park-assist-system) , or «Front Bumper Fascia Center Support Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-body-panels/#bumpers-and-fascias) .
7. Reposition the electrical harness out of the way.
8. Remove the front bumper fascia upper support. Refer to «Front Bumper Fascia Upper Support Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-body-panels/#bumpers-and-fascias) .
9. Place a drain pan under the transmission fluid cooler pipe and the transmission fluid cooler inlet and outlet pipe.
10. Disconnect the transmission fluid cooler pipe retaining ring (1) from the air conditioning condenser. Refer to «Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle__transmission-fluid-cooler-hosepipe-quick-connect-fitting) .
11. Disconnect the transmission fluid cooler pipe (2) from the air conditioning condenser.
12. Disconnect the transmission fluid cooler inlet and outlet pipe retaining ring (1) from the air conditioning condenser. Refer to «Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle__transmission-fluid-cooler-hosepipe-quick-connect-fitting) .
13. Disconnect the transmission fluid cooler inlet and outlet pipe (2) from the air conditioning condenser.
14. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/ats/i-2012-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
15. Remove the air conditioning compressor and condenser hose nut (1) from the air conditioning condenser.
16. Remove the air conditioning compressor and condenser hose (2) from air conditioning condenser.
17. Remove and discard the sealing washer (3).
18. Remove air conditioning condenser outlet tube nut (3) from the condenser.
19. Remove air conditioning condenser outlet tube (5) from the condenser.
20. Lower the drivetrain and front suspension frame enough to access the air conditioning condenser outlet tube to radiator mounting bolt. Refer to «Drivetrain and Front Suspension Frame Removal and Installation»(/cadillac/ats/i-2012-2014/remont/frames-subframes-crossmembers/#frame-and-underbody__drivetrain-and-front-suspension-frame-removal) .
21. Remove the air conditioning condenser outlet tube to radiator mounting bolt (2).
22. Remove the hood latch mounting bolts and reposition the hood latch out of the way. Refer to «Hood Primary and Secondary Latch Replacement»(/cadillac/ats/i-2012-2014/remont/exteriorinterior-trim/#bolted-exterior-body-panels-and-closures) .
23. Remove the upper air baffle and deflector retainers. Refer to «Radiator Air Upper Baffle and Deflector Replacement»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
24. Remove the radiator air lower baffle and deflector side retainers from the radiator and charge air cooler. Refer to «Radiator Air Lower Baffle and Deflector Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
25. Reposition the radiator air lower baffle away from the condenser and radiator.
26. Remove and discard the sealing washer (4).
27. Remove the air conditioning condenser bolts (1) from the charge air cooler radiator.
28. Remove the air conditioning condenser (2) from the charge air cooler radiator.

1. Install the air conditioning condenser (2) to the charge air cooler radiator.
2. Install the air conditioning condenser bolts (1) to the charge air cooler radiator and tighten.
3. Install NEW sealing washer (4) to the air conditioning condenser outlet tube (5). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
4. Install the radiator air lower baffle and deflector side retainers to the radiator and charge air cooler. Refer to «Radiator Air Lower Baffle and Deflector Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
5. Install the upper air baffle and deflector retainers. Refer to «Radiator Air Upper Baffle and Deflector Replacement»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Install the hood latch. Refer to «Hood Primary and Secondary Latch Replacement»(/cadillac/ats/i-2012-2014/remont/exteriorinterior-trim/#bolted-exterior-body-panels-and-closures) .
7. Install the air conditioning condenser outlet tube to radiator mounting bolt (2).
8. Install the drivetrain and front suspension frame. Refer to «Drivetrain and Front Suspension Frame Removal and Installation»(/cadillac/ats/i-2012-2014/remont/frames-subframes-crossmembers/#frame-and-underbody__drivetrain-and-front-suspension-frame-removal) .
9. Install the air conditioning condenser outlet tube (5) to the condenser.
10. Install the air conditioning condenser outlet tube nut (3) to the condenser and tighten to 22 N.m (16 lb ft).
11. Install NEW sealing washer (3) to the air conditioning compressor and condenser hose (2). Refer to «Air Conditioning System Seal Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
12. Install the air conditioning compressor and condenser hose (2) to the air conditioning condenser.
13. Install the air conditioning compressor and condenser hose nut (1) to the air conditioning condenser and tighten to 22 N.m (16 lb ft).
14. Lower the vehicle.
15. Connect the transmission fluid cooler inlet and outlet pipe (2) to the air conditioning condenser. Refer to «Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle__transmission-fluid-cooler-hosepipe-quick-connect-fitting) .
16. Connect the transmission fluid cooler pipe (2) to the air conditioning condenser. Refer to «Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-repair-instructions-on-vehicle__transmission-fluid-cooler-hosepipe-quick-connect-fitting) .
17. Install the front bumper fascia upper support. Refer to «Front Bumper Fascia Upper Support Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-body-panels/#bumpers-and-fascias) .
18. Install the front bumper fascia center support and the forward range radar module if equipped. Refer to «Forward Range Radar Module Replacement»(/cadillac/ats/i-2012-2014/remont/collisionavoidance/#object-detection-system-park-assist-system) , or «Front Bumper Fascia Center Support Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-body-panels/#bumpers-and-fascias) .
19. Install the front bumper impact bar. Refer to «Front Bumper Impact Bar Replacement»(/cadillac/ats/i-2012-2014/remont/exterior-body-panels/#bumpers-and-fascias) .
20. Install the radiator upper brackets (2). Refer to «Radiator Upper Bracket Replacement»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
21. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
22. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement (LTG)»(/cadillac/ats/i-2012-2014/remont/testing-diagnostics/#engine-controlsfuel-20l-ltg-or-25l-lcv-repair-instructions) .
23. Evacuate and charge the air conditioning system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
24. Inspect the transmission fluid level. Refer to «Transmission Fluid Fill Procedure»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__transmission-fluid-fill-procedure) .
25. Inspect for transmission fluid leaks. Refer to «Automatic Transmission Fluid Leaks»(/cadillac/ats/i-2012-2014/remont/automatic-trans/#automatic-transmission-6l45-mya-diagnostic-information-and-procedures__automatic-transmission-fluid-leaks) .

Scheme 16

Condenser Outlet Tube Replacement (LFX)

Scheme 17

Condenser Outlet Tube Replacement (LTG)

Condenser Outlet Tube Replacement (LCV)

Condenser Outlet Tube Replacement (LCV)

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) .
2. Recover the refrigerant system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
3. Drain the engine coolant system. Refer to «Cooling System Draining and Filling (Static Fill)»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (GE 47716)»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
4. Remove the heater inlet hose from the heater core tube. Refer to «Heater Inlet Hose Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Inlet Hose Replacement (LCV, LTG)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
5. Remove the heater outlet hose from the heater core tube. Refer to «Heater Outlet Hose Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (LTG with KL9)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (LTG without KL9)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
6. Remove the evaporator hose assembly from the thermal expansion valve. Refer to «Air Conditioning Evaporator Hose Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
7. Disconnect the right side floor rear air outlet duct from the heater and air conditioning evaporator and blower module assembly. Refer to «Floor Rear Air Outlet Duct Replacement - Right Side»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
8. Disconnect the left side floor rear air outlet duct from the heater and air conditioning evaporator and blower module assembly. Refer to «Floor Rear Air Outlet Duct Replacement - Left Side»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
9. Remove the instrument panel tie bar assembly. Refer to «Instrument Panel Tie Bar Replacement»(/cadillac/ats/i-2012-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
10. From within the engine compartment, remove the heater and air conditioning evaporator and blower module assembly bolt (HVAC), (1) securing the HVAC module assembly to the cowl panel.
11. Remove the HVAC module assembly (1) from the vehicle.
12. Transfer all necessary components

1. Inspect the air conditioning evaporator and blower case drain bellow for cuts, tears or deformation damage to the bellow. If the bellow is damaged, replace the bellow. Refer to «Air Conditioning Evaporator and Blower Case Drain Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. Using a long thin flat blade tool carefully compress the air conditioning evaporator and blower case drain bellow.
3. Position the HVAC module assembly (1) into the vehicle and temporarily support it.
4. Remove the long thin flat blade tool from in between the HVAC drain bellow and the HVAC module assembly.
5. Verify the air conditioning evaporator and blower case drain bellow (1) is aligned with the air conditioning evaporator and blower case drain hole (2).
6. From within the engine compartment, install the HVAC module assembly bolt (1) securing the HVAC module assembly to the cowl panel, and tighten to 9 (80 lb in).
7. Install the instrument panel tie bar assembly. Refer to «Instrument Panel Tie Bar Replacement»(/cadillac/ats/i-2012-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
8. Connect the left side floor rear air outlet duct to the heater and air conditioning evaporator and blower module assembly. Refer to «Floor Rear Air Outlet Duct Replacement - Left Side»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) . NOTE: Do not install the left side front floor console extension panel at this time.
9. Connect the right side floor rear air outlet duct to the heater and air conditioning evaporator and blower module assembly. Refer to «Floor Rear Air Outlet Duct Replacement - Right Side»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) . NOTE: Do not install the right side front floor console extension panel at this time.
10. Install the evaporator hose assembly to the thermal expansion valve. Refer to «Air Conditioning Evaporator Hose Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
11. Install the heater outlet hose to the heater core tube. Refer to «Heater Outlet Hose Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (LCV)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (LTG with KL9)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (LTG without KL9)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
12. Install the heater inlet hose to the heater core tube. Refer to «Heater Inlet Hose Replacement (LFX)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Inlet Hose Replacement (LCV, LTG)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
13. Fill the engine coolant system. Refer to «Cooling System Draining and Filling (Static Fill)»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-static) , «Cooling System Draining and Filling (GE 47716)»(/cadillac/ats/i-2012-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
14. Recharge the refrigerant system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
15. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/ats/i-2012-2014/remont/body-electrical/#battery-charging-system-and-starting-system) .
16. Turn the air conditioning on and set to the full cold position. Set the blower speed to Hi. Let the air conditioning system run for 10 minutes with the left and right side carpet pulled back to visually inspect for water leaks, at the air conditioning evaporator and blower case drain bellow connection.
17. The air conditioning evaporator and blower case drain bellow (1) should seal against the air conditioning evaporator and blower case assembly (2).
18. If a water leak is found, reposition and re-seat the bellow, and re-inspect for a water leak.
19. Install the left and right side front floor console extension panels. Refer to «Front Floor Console Extension Panel Replacement - Left Side»(/cadillac/ats/i-2012-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) , and «Front Floor Console Extension Panel Replacement - Right Side»(/cadillac/ats/i-2012-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .

Scheme 18

Air Conditioning Evaporator Lower Case Replacement

Scheme 19

Air Conditioning Evaporator Upper Case Replacement

Scheme 20

Air Conditioning (A/C) Evaporator Case Assembly Replacement

Scheme 21

Blower Case Replacement

Scheme 22

Blower Lower Case Replacement

Scheme 23

Blower Upper Case Replacement

Scheme 24

Air Conditioning Evaporator Replacement (R134A)

Air Conditioning Evaporator Replacement (1234yf)

Note. Technicians repairing or servicing motor vehicle air conditioning (MVAC) systems must be trained and certified by an EPA approved organization. Certification is obtained by passing an EPA approved examination. (http://www.epa.gov/ozone/title6/609/technicians/609certs.html)

1. Remove the air conditioning (a/c) evaporator case assembly. Refer to «Air Conditioning (A/C) Evaporator Case Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. Remove the air conditioning evaporator core (1) from the air distributor case assembly (2).

1. Position the air conditioning evaporator core (1) into the air distributor case assembly (2).
2. Install the air conditioning (a/c) evaporator case assembly. Refer to «Air Conditioning (A/C) Evaporator Case Assembly Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

Scheme 25

Replacement evaporators shall have a permanent marking (label, stamp, or etching) that indicates that this evaporator design meets SAE J2842 and shall include the wording below or optionally the symbols as shown

Text Only- Label Wording- "Conforms to SAE J2842 (Evaporator Manufacturer's Name or Trademark) Replace only with new evaporator certified to meet SAE J2842.

Leak Free Joints Inside the Passenger Compartment

If a refrigerant joint/connection is made or disturbed inside the passenger cabin the following steps shall be followed by the technician to ensure the joint/connection is leak free.

1. Shall clean all dirt, grease and debris from and around connection joints before disassembly/assembly of refrigerant connections.
2. Shall be advised to carefully inspect the joint/connection seal surfaces for signs of deformation, contamination or damage after disassembly.
3. Shall be advised that Seals/O-rings shall never be reused, but replaced with all new parts.
4. Shall be advised to ensure proper alignment of male/female portions and seal so there is no misalignment and stress on the fitting connection.
5. Shall tighten the joint using the proper torque.
6. With full refrigerant charge installed and the vehicles HVAC blower motor set on its lowest speed, A/C switch off and air distribution set to floor. The technician shall insert a SAE J2913 compliant electronic leak detector set to high sensitivity (4 grams/year leak rate) into the center of a floor duct outlet, as far as possible. The technician shall monitor the electronic leak detector for 5 minutes or until the detector alarms. If electronic leak detector alarms, recover the refrigerant and repair the leak. If after 5 minutes there is no alarm, there is no indication of a leak in the passenger compartment and the repair can be completed.
7. If vehicle is equipped with an auxiliary evaporator, monitor the air downstream from the evaporator at the outlet duct closest to the auxiliary unit under the same conditions and set up as step 6.

Proper Disposal of the Replaced Evaporator

The replaced evaporator shall be disabled to ensure that it never be repaired or reused.

Disable the replaced evaporator by completing one of the following steps

1. Using tin snips sever a minimum of 3 of the evaporators tubes.
2. Drill or Punch a minimum of two 25 mm (.25 inch) holes in each end tank.

Scheme 26

Air Conditioning Evaporator and Blower Case Drain Replacement

Scheme 27

Heater Inlet Hose Replacement (LFX)

Scheme 28

Heater Inlet Hose Replacement (LCV, LTG)

Scheme 29

Auxiliary Heater Outlet Hose Replacement (LTG with M3L, KL9)

Scheme 30

Heater Outlet Hose Replacement (LFX)

Scheme 31

Heater Outlet Hose Replacement (LCV)

Scheme 32

Heater Outlet Hose Replacement (LTG with KL9)

Scheme 33

Heater Outlet Hose Replacement (LTG without KL9)

Scheme 34

Heater Core Tube Bracket Replacement

Scheme 35

Heater Inlet Hose Connector Replacement (LFX)

Scheme 36

Heater Inlet Hose Connector Replacement (LCV, LTG)

Scheme 37

Heater Outlet Hose Connector Replacement (LFX)

Scheme 38

Heater Outlet Hose Connector Replacement (LCV, LTG)

Scheme 39

Passenger Compartment Air Filter Replacement

Scheme 40

Air Inlet Housing Replacement

Scheme 41

Blower Motor Replacement

Scheme 42

Side Window Defogger Outlet Grille Replacement - Left Side

Scheme 43

Side Window Defogger Outlet Grille Replacement - Right Side

Scheme 44

Air Distributor Case Replacement

Scheme 45

Instrument Panel Outer Air Outlet Replacement - Left Side

Scheme 46

Instrument Panel Center Air Outlet Bracket Replacement - Driver Side

Scheme 47

Instrument Panel Center Air Outlet Bracket Replacement - Passenger Side

Scheme 48

Instrument Panel Center Air Outlet Replacement - Left Side

Scheme 49

Instrument Panel Center Air Outlet Replacement - Right Side

Scheme 50

Instrument Panel Outer Air Outlet Replacement - Right Side

Scheme 51

Floor Front Air Outlet Duct Replacement - Right Side

Scheme 52

Floor Front Air Outlet Duct Replacement - Left Side

Scheme 53

Front Floor Console Rear Air Duct Replacement

Scheme 54

Front Floor Console Rear Air Outlet Replacement

Scheme 55

Windshield Defroster Nozzle Duct Replacement

Scheme 56

Air Distributor Center Duct Replacement

Scheme 57

Air Distributor Lower Duct Replacement

Scheme 58

Air Distributor Duct Replacement - Left Side

Scheme 59

Air Distributor Duct Replacement - Right Side

Scheme 60

Side Window Defogger Outlet Duct Replacement - Left Side

Scheme 61

Side Window Defogger Outlet Duct Replacement - Right Side

Scheme 62

Floor Rear Air Outlet Duct Replacement - Left Side

Scheme 63

Floor Rear Air Outlet Duct Replacement - Right Side

Scheme 64

Heater and Air Conditioning Control Temperature Lever Replacement

Scheme 65

Heater and Air Conditioning Control Temperature Lever Replacement - Right Side

Scheme 66

Heater and Air Conditioning Control Temperature Lever Replacement - Left Side

Scheme 67

Heater Core Replacement

Scheme 68

Heater Water Auxiliary Pump Replacement (LTG with KL9)

Engine Coolant

Engine coolant is the key element of the heating system. The thermostat controls engine operating coolant temperature. The thermostat also creates a restriction for the cooling system that promotes a positive coolant flow and helps prevent cavitation. Coolant enters the heater core through the inlet heater hose, in a pressurized state.

The heater core is located inside the HVAC module. The heat of the coolant flowing through the heater core is absorbed by the ambient air drawn through the HVAC module. Heated air is distributed to the passenger compartment, through the HVAC module, for passenger comfort.

The amount of heat delivered to the passenger compartment is controlled by opening or closing the HVAC module air temperature door. The coolant exits the heater core through the return heater hose and recirculated back through the engine cooling system.

A/C Cycle

Refrigerant is the key element in an air conditioning system. R-134a is a very low temperature gas that can transfer the undesirable heat and moisture from the passenger compartment to the outside air.

The A/C compressor is belt driven and operates when the magnetic clutch is engaged. The compressor builds pressure on the vapor refrigerant. Compressing the refrigerant also adds heat to the refrigerant. The refrigerant is discharged from the compressor, through the discharge hose, and forced to flow to the condenser and then through the balance of the A/C system. The A/C system is mechanically protected with the use of a high pressure relief valve. If the high pressure switch were to fail or if the refrigerant system becomes restricted and refrigerant pressure continued to rise, the high pressure relief will pop open and release refrigerant from the system.

Compressed refrigerant enters the condenser in a high temperature, high pressure vapor state. As the refrigerant flows through the condenser, the heat of the refrigerant is transferred to the ambient air passing through the condenser. Cooling the refrigerant causes the refrigerant to condense and change from a vapor to a liquid state.

The condenser is located in front of the radiator for maximum heat transfer. The condenser is made of aluminum and aluminum cooling fins, which allows rapid heat transfer for the refrigerant. The semi-cooled liquid refrigerant exits the condenser and flows through the evaporator hose, to the thermal expansion valve.

The thermal expansion valve is attached between the evaporator tubes and evaporator hose. The thermal expansion valve is the dividing point for the high and the low pressure sides of the A/C system. As the refrigerant passes through the thermal expansion valve, the pressure of the refrigerant is lowered. Due to the pressure differential of the liquid refrigerant, the refrigerant will begin to vaporize at the thermal expansion valve. The thermal expansion valve also meters the amount of liquid refrigerant that can flow into the evaporator.

Refrigerant exiting the thermal expansion valve flows into the evaporator core in a low pressure, liquid state. Ambient air is drawn through the HVAC module and passes through the evaporator core. Warm and moist air will cause the liquid refrigerant to boil inside of the evaporator core. The boiling refrigerant absorbs heat from the ambient air and draws moisture onto the evaporator. The refrigerant exits the evaporator back through the thermal expansion valve, through the outlet line of the evaporator hose, into the suction line and back to the compressor, in a vapor state completing the A/C cycle of heat removal. At the compressor, the refrigerant is compressed again and the cycle of heat removal is repeated.

The conditioned air is distributed through the HVAC module for passenger comfort. The heat and moisture removed from the passenger compartment will also change form, or condense, and is discharged from the HVAC module as water under the vehicle.

Special Tools

Illustration Tool Number / Description CH 37872 J 37872 Universal Spanner Wrench BO 38185 J 38185 Hose Clamp Pliers GE 39400-A J 39400-A Halogen Leak Detector GE 41447 J 41447 R-134a A/C Tracer Dye - Box of 24 GE 42220 J 42220 Universal 12V Leak Detection Lamp GE 43872 J 43872 Fluorescent Dye Cleaner GE 45037 J 45037 A/C Oil Injector GE 45268 J 45268 A/C Flushing Adapter Kit GE 46246 J 46246 Valve Core Tool GE 46297 J 46297 A/C Dye Injector Kit GE 46297-12 J 46297-12 Replacement Dye Cartridges GE 48800 J 43600 CoolTech A/C Recharge Machine GE 50078 Electronic Leak Detector

Scheme 69

Scheme 70

Scheme 71

Scheme 72

Scheme 73

Scheme 74

Scheme 75

Scheme 76

Scheme 77

Scheme 78

Scheme 79

See also:
• Diagnostic Starting Point - Vehicle
• Symptoms - HVAC Systems - Automatic
• Checking Aftermarket Accessories
• Testing for Intermittent Conditions and Poor Connections
• Moving Parts and Hot Surfaces Warning
• Automatic HVAC Description and Operation
• Temperature Valve Actuator Replacement - Right Side
• Engine Fails To Reach Normal Operating Temperature
• Drive Belt Falls Off and Excessive Wear Diagnosis
• Drive Belt Falls Off and Excessive Wear Diagnosis
• Drive Belt Tensioner Diagnosis
• Drive Belt Tensioner Diagnosis
• Drive Belt Replacement
• Drive Belt Replacement
• Vibration Analysis - Engine
• Instrument Panel Carrier Replacement
• Loss of Coolant
• Oil Leak Diagnosis
• Fluid Leak Diagnosis
• Afterblow Enabling
• Fastener Caution
• Air Cleaner Assembly Replacement
• Front Wheelhouse Liner Replacement
• Air Cleaner Assembly Replacement (LTG)
• Lifting and Jacking the Vehicle
• Front Air Deflector Replacement
• Radiator Air Lower Baffle and Deflector Replacement (LCV, LFX)
• Forward Range Radar Module Replacement
• Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection
• Drivetrain and Front Suspension Frame Removal and Installation
• Hood Primary and Secondary Latch Replacement
• Transmission Fluid Fill Procedure
• Automatic Transmission Fluid Leaks
• Battery Negative Cable Disconnection and Connection
• Cooling System Draining and Filling (Static Fill)
• Cooling System Draining and Filling (GE 47716)
• R-1234yf Proper Service Procedures Warning
• Front Body Exhaust Heat Shield Replacement (Right)
• Transmission Replacement
• Special Tools
• Cooling System Leak Testing
• Instrument Panel Lower Airbag Replacement - Passenger Side
• Radio Control Assembly Replacement
• Front Floor Panel Carpet Replacement - Left Side
• Adhesives, Fluids, Lubricants, and Sealers
• Leak Testing
• Noise Diagnosis - HVAC Module
• Noise Diagnosis - Air Conditioning (A/C) System
• Noise Diagnosis - Blower Motor
• Odor Diagnosis
• Special Tools
• Refrigerant Recovery and Recharging (R-134a)
• A/C Diagnostics Chart
• Heater Core Replacement
• Air Conditioning (A/C) System Performance Test (LFX, LTG)
• Heating Performance Diagnostic
• Refrigerant System Specifications
• Air Conditioning Compressor Oil Diagnosis
• Air Conditioning Clutch Drive Plate Adjustment
• Condenser Outlet Tube Replacement (LCV)