Heating, Ventilation, and Air Conditioning Cadillac CTS II

Fastener Tightening Specifications

Refrigerant System Capacities

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.

Leak Testing

Special Tools

1. J 39400-A Halogen Leak Detector. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. J 41447 R-134A A/C Tracer Dye-Box of 24. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
3. J 42220 Universal 12V Leak Detection Lamp
4. J 43872 Fluorescent Dye Cleaner. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
5. J 46297 A/C Dye Injector Kit. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
6. J 46297-12 Replacement Dye Cartridges. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

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 , even though the A/C system contains fluorescent dye. See Special Tools .

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 .
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 . See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

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 . See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

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 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 . See Special Tools .

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.

Scheme 1

A/C Performance Table

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

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

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

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

Heating Performance Diagnostic

Defrosting Insufficient

Noise Diagnosis - Blower Motor

Air Conditioning Compressor Oil Diagnosis

Noise Diagnosis - Air Conditioning (A/C) System

Noise Diagnosis - HVAC Module

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/cts/ii-2007-2014/remont/automatic-hvac-system/#hvac-system-automatic__afterblow-enabling) .

Refrigerant Recovery and Recharging

Special Tools

1. J 43600 ACR 2000 Air Conditioning Service Center. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. J 45037 A/C Oil Injector. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

The J 43600 is a complete air conditioning service center for R-134a. See Special Tools . 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 J 43600 ACR 2000 manual for operation and setup instruction. See Special Tools . Always recharge the A/C System with the proper amount of R-134a. Refer to Refrigerant System Capacities 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 oil must be replenished. Oil can be injected into a charged system using J 45037 . See Special Tools . For the proper quantities of oil to add to the A/C refrigerant system, refer to Refrigerant System Capacities .

Flushing

Special Tools

1. J 41447 R-134A A/C Tracer Dye - Box of 24. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. J 42220 Universal 12V Leak Detection Lamp
3. J 43600 ACR 2000 Air Conditioning Service Center. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
4. J 45268 A/C Flush Adapter Kit. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

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

Flushing is intended to remove the following

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

Forward Flushing Setup

1. Install the J 45268-7 (2) onto the suction line adapter block J 45268-13 (1).
2. Install the J 45268-8 (3) onto the discharge line adapter block J 45268-12 (4).

Reverse Flushing Setup

1. Install the J 45268-8 (2) onto the suction line adapter block J 45268-13 (1).
2. Install the J 45268-7 (3) onto the discharge line adapter block J 45268-12 (4).

Flush Procedure

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Remove the thermal expansion valve (TXV). Refer to «Air Conditioning Evaporator Thermal Expansion Valve Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
3. Install new O-rings onto the evaporator core and A/C lines. Refer to «Air Conditioning O-Ring Seal Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
4. Install the A/C lines into J 45268-110.
5. Install J 45268-110 onto the evaporator core.
6. Install the TXV line bracket.
7. Install TXV mounting bolts and tighten to 3.5 N.m (31 lb in).
8. Remove the A/C compressor. Refer to «Air Conditioning Compressor Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) or «Air Conditioning Compressor Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
9. Service the filter with AC Delco P/N GF 470, before each flush.
10. Install the J 45268-13 to the A/C suction line.
11. Install the J 45268-12 to the A/C discharge line.
12. Connect the J 45268-1 flush filter to the J 45268-7 flush fitting.
13. Connect the blue hose from the J 43600 to J 45268-1 flush filter adapter. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
14. Connect the red hose from the J 43600 to J 45268-8 flush fitting. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
15. Flush the A/C system. Follow the instructions supplied with the J 43600 . See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
16. Disconnect the red hose from the J 43600 to J 45268-8 flush fitting. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
17. Disconnect the blue hose from the J 43600 to J 45268-1 flush filter adapter. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
18. Disconnect the J 45268-1 flush filter from the J 45268-7 flush fitting.
19. Remove the J 45268-12 from the A/C discharge line.
20. Remove the J 45268-13 from the A/C suction line.
21. If you will reinstall the removed A/C compressor, perform the following procedure: Drain and properly discard the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor. Add the total system capacity of PAG oil into the A/C compressor oil drain. Refer to «Refrigerant System Capacities»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-capacities) . NOTE: Flushing will remove the fluorescent leak detection dye from the A/C system. Add one bottle of J 41447 directly to the A/C compressor. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
22. Install the A/C compressor. Refer to «Air Conditioning Compressor Replacement (LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) or «Air Conditioning Compressor Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
23. Remove the TXV mounting bolts.
24. Remove the TXV line bracket.
25. Remove J 45268-110 from the evaporator core.
26. Remove the A/C lines from J 45268-110.
27. Inspect the TXV for debris. Clean or replace as needed.
28. Replace the desiccant bag. Refer to «Air Conditioning Refrigerant Desiccant Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
29. Evacuate and recharge the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
30. Leak test the fittings using J 42220 .

Draining Procedure

1. Before draining oil, position the compressor verdically (clutch facing upwards) and let it sit for 1 minute.
2. Position the compressor horizontally, with the ports facing downward, rotate the clutch and shake the compressor in order to remove as much oil from the compressor as possible.
3. Drain the oil from both the suction and discharge ports of the removed compressor into a clean, graduated container. Rotate the compressor shaft to assist in draining the compressor.
4. Measure and record the amount of oil drained from the removed compressor. This measurement will be used during installation of the replacement compressor.
5. Inspect oil drained from removed comperssor. Refer to «Air Conditioning Compressor Oil Diagnosis»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-compressor-oil-diagnosis)
6. Properly discard the used refrigerant oil.

Balancing Procedure

1. Before installing the compressor, the refrigerant oil will have to be fully drained.
2. Add back the same quantity of polyalkylene glycol (PAG) oil as drained from the removed compressor. Refer to the amount of refrigerant oil recorded during the compressor removal.

Scheme 2

Scheme 3

Removal Procedure

1. Remove the engine belt. Refer to «Air Conditioning Compressor and Power Steering Pump Belt Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-30l-or-36l-repair-instructions-on-vehicle-1-of-2) .
2. Remove the clutch plate retaining bolt (1).
3. Remove the clutch plate assembly (2).
4. Remove the clutch hub/bearing snap ring (3).
5. Remove the clutch hub/bearing assembly (4).

Installation Procedure

1. Install the clutch hub/bearing assembly (4).
2. Install the clutch hub/bearing snap ring (3).
3. Install the clutch plate assembly (2).
4. Install the clutch plate retaining bolt (1) and tighten to 18 N.m (13 lb ft).
5. Install the engine belt. Refer to «Air Conditioning Compressor and Power Steering Pump Belt Replacement»(/cadillac/cts/ii-2007-2014/remont/mechanical/#engine-mechanical-30l-or-36l-repair-instructions-on-vehicle-1-of-2) .

1. Disassemble the A/C refrigerant components. Refer to the appropriate repair procedure
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.

Air Conditioning Line/Tube Connector Removal/Replacement

Tools Required

1. J 39400-A Halogen Leak Detector. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. J 45689 A/C Quick Joint Tool. See «Special Tools»(/cadillac/cts/ii-2007-2014/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/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Locate the A/C quick connect fitting locking tab access slots (1).
3. Carefully insert J 45689 into the locking tab access slots. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
4. Gently press down on the locking tab until the quick connect fitting locking tab releases.
5. Open and remove the quick connect fitting from the A/C refrigerant component.

1. Install the A/C quick connect fitting to the A/C refrigerant component.
2. Close the A/C quick connect fitting.
3. Evacuate and recharge the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
4. Leak test the fittings of the component using J 39400-A . See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

Scheme 4

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
3. Remove the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
4. Remove the front compartment lower noise shield (if equipped). Refer to «Front Compartment Lower Noise Shield Replacement (All Wheel Drive)»(/cadillac/cts/ii-2007-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Front Compartment Lower Noise Shield Replacement (Rear Wheel Drive)»(/cadillac/cts/ii-2007-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
5. Remove the engine coolant fan shroud. Refer to «Engine Coolant Fan Shroud Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Remove the radiator outlet hose from the thermostat housing. Refer to «Radiator Outlet Hose Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Remove the heater inlet/outlet hoses from the water pump. «Heater Inlet Hose/Pipe and Heater Outlet Hose/Pipe Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
8. Remove the compressor hose bolt at the compressor.
9. Remove the compressor hose from the compressor.
10. Unclip the condenser and evaporator tube from the compressor hose bracket.
11. Remove the compressor hose bracket bolt from the engine.
12. Remove the compressor hose bracket nut (1) from the wheelhouse panel stud.
13. Remove the compressor hose from the evaporator core. Refer to «Air Conditioning Line/Tube Connector Removal/Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-linetube-connector-removalreplacement) .
14. Remove the compressor hose from the vehicle.

1. Install the compressor hose to the evaporator core. Refer to «Air Conditioning Line/Tube Connector Removal/Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-linetube-connector-removalreplacement) .
2. Install the compressor hose bracket nut (1) from the wheelhouse panel stud and tighten to 9 N.m (80 lb in).
3. Install the compressor hose bracket bolt to the engine and tighten to 10 N.m (89 lb in).
4. Install the compressor hose to the compressor.
5. Install the compressor hose bolt to the compressor and tighten to 9 N.m (80 lb in).
6. Clip thecondenser and evaporator tube to the compressor hose bracket.
7. Install the heater inlet/outlet hoses to the water pump. «Heater Inlet Hose/Pipe and Heater Outlet Hose/Pipe Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
8. Install the radiator outlet hose to the thermostat housing. Refer to «Radiator Outlet Hose Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
9. Install the engine coolant fan shroud. Refer to «Engine Coolant Fan Shroud Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
10. Install the front compartment lower noise shield (if equipped). Refer to «Front Compartment Lower Noise Shield Replacement (All Wheel Drive)»(/cadillac/cts/ii-2007-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Front Compartment Lower Noise Shield Replacement (Rear Wheel Drive)»(/cadillac/cts/ii-2007-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
11. Install the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
12. Lower the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
13. Evacuate and recharge the system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .

Scheme 5

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
3. Remove the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
4. Remove the front compartment lower noise shield (if equipped). Refer to «Front Compartment Lower Noise Shield Replacement (All Wheel Drive)»(/cadillac/cts/ii-2007-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Front Compartment Lower Noise Shield Replacement (Rear Wheel Drive)»(/cadillac/cts/ii-2007-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
5. Remove the engine coolant fan shroud. Refer to «Engine Coolant Fan Shroud Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Remove the radiator outlet hose from the thermostat housing. Refer to «Radiator Outlet Hose Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Remove the heater inlet/outlet hoses from the water pump. «Heater Inlet Hose/Pipe and Heater Outlet Hose/Pipe Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
8. Remove the compressor and condenser hose bolt (1) at the compressor.
9. Remove the compressor and condenser hose (2) from the compressor.
10. Remove the compressor and condenser hose bracket bolt (1) from the engine.
11. Remove the compressor and condenser hose bolt (1) from the condenser.
12. Remove the compressor and condenser hose (2) from the vehicle.

1. Install the compressor and condenser hose (2) to the condenser.
2. Install the compressor and condenser hose bolt (1) to the condenser and tighten to 10 N.m (89 lb in).
3. Install the compressor and condenser hose bracket bolt (1) to the engine and tighten to 10 N.m (89 lb in).
4. Install the compressor and condenser hose (2) to the compressor.
5. Install the compressor and condenser hose bolt (1) to the compressor and tighten to 9 N.m (80 lb in).
6. Install the heater inlet/outlet hoses to the water pump. «Heater Inlet Hose/Pipe and Heater Outlet Hose/Pipe Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
7. Install the radiator outlet hose to the thermostat housing. Refer to «Radiator Outlet Hose Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Install the engine coolant fan shroud. Refer to «Engine Coolant Fan Shroud Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
9. Install the front compartment lower noise shield. Refer to «Front Compartment Lower Noise Shield Replacement (All Wheel Drive)»(/cadillac/cts/ii-2007-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Front Compartment Lower Noise Shield Replacement (Rear Wheel Drive)»(/cadillac/cts/ii-2007-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
10. Install the front air deflector. Refer to «Front Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
11. Lower the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
12. Evacuate and recharge the system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .

Scheme 6

Scheme 7

Special Tools

J 39400-A Halogen Leak Detector. See Special Tools .

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Remove the front bumper facia deflector. Refer to «Front Bumper Fascia Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
3. Remove the receiver dryer bottom plug (1).
4. Remove the filter (2).
5. Remove the desiccant bag (3).

1. Install the desiccant bag (3).
2. Install the filter (2).
3. Lubricate the O-rings on the plug with refrigerant oil before installing. Refer to «Air Conditioning O-Ring Seal Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
4. Install the bottom plug (1) and tighten to. 12.5 N.m (111 lb in).
5. Install the front bumper facia deflector. Refer to «Front Bumper Fascia Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
6. Lower the vehicle.
7. Add the proper amount of oil. Refer to «Refrigerant System Capacities»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-capacities) .
8. Evacuate and recharge the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
9. Leak test the fittings of the component with J 39400-A . See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

J 39400-A Halogen Leak Detector. See Special Tools .

1. Remove the HVAC module. Refer to «Air Conditioning and Heater Module Assembly Removal and Installation»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-and-heater-module-assembly) .
2. Remove the insulation (1) from the thermal expansion valve (TXV). Discard the used insulation.
3. Remove the HVAC line clamp screw.
4. Remove the HVAC line clamp.
5. Remove the bolts (1) that secure the TXV to the evaporator.
6. Remove the TXV line bracket.
7. Remove the TXV from the evaporator core.
8. Separate the TXV from the A/C lines by pulling straight out.
9. Remove the TXV.

1. Lubricate the O-rings. Refer to «Air Conditioning O-Ring Seal Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. Install the A/C lines into the TXV.
3. Carefully slide the TXV onto the evaporator core until seated.
4. Install the TXV line bracket.
5. Install the bolts (1) that secure the TXV to the evaporator and tighten to 3.5 N.m (31 lb in).
6. Install the HVAC line clamp.
7. Install the HVAC line clamp screw and tighten to 1 N.m (8 lb in).
8. Install the HVAC module. Refer to «Air Conditioning and Heater Module Assembly Removal and Installation»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-and-heater-module-assembly) .
9. Install new insulation (1) onto the lines and TXV.

Scheme 8

Scheme 9

J 39400-A: Halogen Leak Detector

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
3. Remove the front air deflector retainers (2).
4. Remove the front air deflector bolts (1).
5. Remove the front air deflector (3).
6. Remove the condenser upper bracket bolts (1).
7. Remove the condenser lower mounting bolts (1).
8. Remove the a/c compressor and a/c condenser hose bolt (1).
9. Disconnect the a/c compressor and a/c condenser hose (2) from the condenser.
10. Remove and discard the O-ring.
11. Remove the a/c condenser out tube bolt (1).
12. Disconnect the a/c condenser out tube (2) from the condenser.
13. Remove and discard the O-ring.
14. Remove the condenser (1).

1. If replacing the condenser, add the specified amount of PAG oil directly to the condenser. Refer to «Refrigerant System Capacities»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-capacities) .
2. Install the condenser (1).
3. Install a new O-ring to the condenser tube. Refer to «Air Conditioning O-Ring Seal Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
4. Connect the a/c condenser out tube (2) to the condenser.
5. Install the a/c condenser out tube bolt (1) and tighten to 9 N.m (80 lb in).
6. Install a new O-ring to the discharge line. Refer to «Air Conditioning O-Ring Seal Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
7. Connect the a/c compressor and a/c condenser hose (2) to the condenser.
8. Install the a/c compressor and a/c condenser hose bolt (1) and tighten to 9 N.m (80 lb in).
9. Install the condenser lower mounting bolts (1) and tighten to 5.4 N.m (48 lb in).
10. Install the condenser upper bracket bolts (1) and tighten to 5.4 N.m (48 lb in).
11. Install the front air deflector (3).
12. Install the front air deflector bolts (1).
13. Install the front air deflector retainers (2).
14. Lower the vehicle.
15. Install the power steering cooler mounting bolts. Refer to «Power Steering Fluid Cooler Replacement (V6)»(/cadillac/cts/ii-2007-2014/remont/electronic-steering/#power-steering-system) or «Power Steering Fluid Cooler Replacement (V8)»(/cadillac/cts/ii-2007-2014/remont/electronic-steering/#power-steering-system) .
16. Evacuate and recharge the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
17. Leak test the fittings of the component using the J 39400-A: leak detector

J 39400-A: Halogen Leak Detector

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) or «Air Cleaner Assembly Replacement (LLT)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions__air-cleaner-assembly-replacement-llt) .
3. Remove the A/C quick connect fitting at the liquid line. Refer to «Air Conditioning Line/Tube Connector Removal/Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-linetube-connector-removalreplacement) .
4. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
5. Remove the front air deflector. Refer to «Front Bumper Fascia Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
6. Remove the condenser tube to condenser retaining bolt (1).
7. Disconnect the condenser tube from the fan shroud retainer clip.
8. Disconnect the condenser tube (2) from the condenser.
9. Disconnect the condenser tube from the liquid line. Refer to «Air Conditioning Line/Tube Connector Removal/Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-linetube-connector-removalreplacement)
10. Remove the condenser tube.
11. Remove and discard the O-rings.

1. Install the new O-rings to the condenser tube. Refer to «Air Conditioning O-Ring Seal Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. Install the condenser tube.
3. Connect the condenser tube to the liquid line. Refer to «Air Conditioning Line/Tube Connector Removal/Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-linetube-connector-removalreplacement)
4. Connect the condenser tube (2) to the condenser.
5. Connect the condenser tube to the fan shroud retainer clip.
6. Install the condenser tube to condenser retaining bolt (1) and tighten to 9 N.m (80 lb in).
7. Install the front air deflector. Refer to «Front Bumper Fascia Air Deflector Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bumpers-and-fascia) .
8. Lower the vehicle.
9. Install the A/C quick connect fitting at the liquid line. Refer to «Air Conditioning Line/Tube Connector Removal/Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-linetube-connector-removalreplacement) .
10. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions) or «Air Cleaner Assembly Replacement (LLT)»(/cadillac/cts/ii-2007-2014/remont/testing-diagnostics/#engine-controls-and-fuel-30l-or-36l-repair-instructions__air-cleaner-assembly-replacement-llt) .
11. Evacuate and recharge the A/C system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
12. Using J 39400-A: Halogen Leak Detector, leak test the fittings of the component.

Air Conditioning and Heater Module Assembly Removal and Installation

Special Tools

1. J 38185 Hose Clamp Pliers
2. J 39400-A Halogen Leak Detector. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
3. J 45689 A/C Quick Joint Tool. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Remove the battery. Refer to «Battery Replacement»(/cadillac/cts/ii-2007-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
3. Drain the coolant. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
4. Using the J 38185 disconnect the heater inlet hose (1).
5. Using the J 38185 disconnect the heater outlet hose (1).
6. Disconnect both A/C lines at the cowl.
7. Using the J 45689 (1) insert the probe end into the two small openings of the plastic quick joint. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
8. Remove both quick joint clamps.
9. Disconnect both A/C lines.
10. Remove the IP Carrier. Refer to «Instrument Panel Carrier Replacement (Left Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) or «Instrument Panel Carrier Replacement (Right Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
11. Remove the air inlet assembly.
12. Disconnect the HVAC module electrical connector.
13. Disconnect the HVAC module drain tube (2) from the floor.
14. Press the tab and release the left rear duct from the HVAC module.
15. Disconnect the left rear heater duct from the HVAC module.
16. Press the tab and release the right rear duct from the HVAC module.
17. Disconnect the right rear heater ducts from the HVAC module.
18. Remove the lower left HVAC module mounting nut (1).
19. Remove the upper left HVAC module mounting nut (1).
20. Remove the HVAC module from the vehicle.
21. Remove the foam from the A/C lines.
22. Remove the foam from around the heater pipes.

1. Install the thick foam packing (1) on the heater core pipes.
2. Install the thin foam packing (2) on the heater core pipes.
3. Install the thick foam packing (1) on the A/C lines.
4. Install the thin foam packing (2) on the A/C lines.
5. Install the HVAC module into the vehicle.
6. Install the upper left HVAC module mounting nut (1) and tighten to 9 N.m (80 lb in).
7. Install the lower left HVAC module mounting nut (1) and tighten to 9 N.m (80 lb in).
8. Connect the rear heater ducts to the HVAC module.
9. Connect the drain tube to the bottom of the HVAC module.
10. Connect the drain tube (2) to the floor.
11. Connect the HVAC electrical connector.
12. Install the air inlet assembly.
13. Lubricate the O-rings of the A/C line with refrigerant oil before connecting the A/C lines. Refer to «Air Conditioning O-Ring Seal Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
14. Install the A/C line and A/C line quick connect line clamp (1) to the evaporator.
15. Engage the clamp.
16. Install the A/C line and A/C line quick connect line clamp (1) to the evaporator.
17. Engage the clamp.
18. Connect the heater inlet hose (1) using J 38185 .
19. Connect the heater outlet hose (1) using J 38185 .
20. Install the IP carrier. Refer to «Instrument Panel Carrier Replacement (Left Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) or «Instrument Panel Carrier Replacement (Right Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
21. Install the battery. Refer to «Battery Replacement»(/cadillac/cts/ii-2007-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
22. Fill the coolant. Refer to «Cooling System Draining and Filling (Static Fill LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) or «Cooling System Draining and Filling (GE 47716 LF1, LLT)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
23. Evacuate and recharge the AC system. Refer to «Refrigerant Recovery and Recharging»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
24. Leak test the fittings of the component using J 39400-A . See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

1. Remove the HVAC module assembly. Refer to «Air Conditioning and Heater Module Assembly Removal and Installation»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-and-heater-module-assembly) .
2. Remove the insulation (1) from the thermal expansion valve (TXV).
3. Remove the HVAC line clamp screw.
4. Remove the HVAC line clamp.
5. Remove the TXV to evaporator bolts (1).
6. Remove the TXV line bracket.
7. Remove the TXV from the evaporator core.
8. Separate the TXV from the A/C lines by pulling straight out.
9. Remove the TXV.
10. Remove the screws that hold the case together.
11. Remove the clips that hold the case together.
12. Disconnect the thermistor electrical connector.
13. Separate the HVAC module.
14. Remove the thermistor from the evaporator core.
15. Remove the evaporator core.

1. Add refrigerant oil. Refer to «Refrigerant System Capacities»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-capacities) .
2. Install new evaporator core seals to evaporator.
3. Install the evaporator core.
4. Install the thermistor to the evaporator into the same position as removed.
5. Slide the HVAC module together.
6. Install the screws that hold the case together and tighten to 1 N.m (8 lb in).
7. Install the clips that hold the case together.
8. Connect the thermistor electrical connector.
9. Lube A/C lines with refrigerant oil before installing. Refer to «Air Conditioning O-Ring Seal Replacement»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
10. Install the A/C lines into the TXV.
11. Carefully slide the TXV onto the evaporator core until seated.
12. Install the TXV line bracket.
13. Install the TXV to evaporator bolts (1) and tighten to 3.5 N.m (31 lb in).
14. Install the HVAC line clamp.
15. Install the HVAC line clamp screw and tighten to 1 N.m (8 lb in).
16. Install the insulation (1) onto the lines and TXV.
17. Install the HVAC module. Refer to «Air Conditioning and Heater Module Assembly Removal and Installation»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-and-heater-module-assembly) .

Scheme 10

1. Peel back enough carpet and insulation to access drain tube.
2. Remove the rubber adhesive patch (1) from around the drain tube (2).
3. Open the flap in the tunnel insulator and unsnap drain fitting from the tunnel sheet metal.
4. Remove the HVAC module drain tube from the HVAC module.

1. Install the HVAC module drain tube to the HVAC module.
2. Ensure that the drain tube is fully seated to the HVAC module.
3. Snap drain fitting into the tunnel sheet metal.
4. Close the flap on the tunnel insulator.
5. Install the rubber adhesive patch (1) around the drain tube (2).
6. Install insulation and carpet to original position.

Scheme 11

Scheme 12

J 47622: Hose Clamp Pliers

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
3. Remove the front compartment lower noise shield (if equipped). Refer to «Front Compartment Lower Noise Shield Replacement (All Wheel Drive)»(/cadillac/cts/ii-2007-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Front Compartment Lower Noise Shield Replacement (Rear Wheel Drive)»(/cadillac/cts/ii-2007-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
4. Remove manifold cover.
5. Remove vehicle cross brace. Refer to «Cross Vehicle Brace Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
6. Remove charge air cooler pipe assembly. Refer to «Charge Air Cooler Coolant Pipe Replacement»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
7. Remove charge air coolant reservoir. Refer to «Charge Air Cooler Coolant Reservoir Replacement»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Reposition the heater hose clamps (1) at the engine using J 47622: Hose Clamp Pliers.
9. Remove the heater hoses (2) from the engine.
10. Reposition the surge tank outlet hose clamp (1) at the heater hose using J 47622: Hose Clamp Pliers.
11. Remove the surge tank outlet hose (2) from the heater hose.
12. Reposition the heater hose clamps (1) at the heater core using J 47622: Hose Clamp Pliers.
13. Remove the heater hoses (2) from the heater core.
14. Remove heater pipe harness retainer brace and reposition harness.
15. Remove the heater hose nuts (1).
16. Remove the heater hoses (2) from the vehicle.

1. Install the heater hoses (2) to the vehicle.
2. Install the heater hose nuts (1) and tighten to 10 N.m (89 lb in).
3. Install heater pipe harness retainer brace and reposition harness.
4. Install the heater hoses (2) from the heater core.
5. Reposition the heater hose clamps (1) at the heater core using J 47622: Hose Clamp Pliers.
6. Install the surge tank outlet hose (2) from the heater hose.
7. Reposition the surge tank outlet hose clamp (1) at the heater hose using J 47622: Hose Clamp Pliers.
8. Install the heater hoses (2) to the engine.
9. Reposition the heater hose clamps (1) at the engine using J 47622: Hose Clamp Pliers.
10. Install charge air coolant reservoir. Refer to «Charge Air Cooler Coolant Reservoir Replacement»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
11. Install charge air cooler pipe assembly. Refer to «Charge Air Cooler Coolant Pipe Replacement»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) .
12. Install vehicle cross brace. Refer to «Cross Vehicle Brace Replacement»(/cadillac/cts/ii-2007-2014/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
13. Install manifold cover.
14. Install the front compartment lower noise shield (if equipped). Refer to «Front Compartment Lower Noise Shield Replacement (All Wheel Drive)»(/cadillac/cts/ii-2007-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) or «Front Compartment Lower Noise Shield Replacement (Rear Wheel Drive)»(/cadillac/cts/ii-2007-2014/remont/frames-subframes-crossmembers/#frame-and-underbody) .
15. Lower the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
16. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system) or «Cooling System Draining and Filling (GE 47716 LSA)»(/cadillac/cts/ii-2007-2014/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-and-filling-ge) .

1. Remove the air inlet grille panel. Refer to «Air Inlet Grille Panel Replacement»(/cadillac/cts/ii-2007-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
2. With two hands release the tabs on each side of the access cover.
3. Lift up the filter access cover (1).
4. Remove the filter (1) from the filter housing.
5. Gently pry out on the filter housing to separate the housing from the sheet metal.
6. Remove the passenger air filter housing (1).

1. Install the passenger air filter housing (1).
2. Press the passenger air filter housing until all clips engage into the sheet metal.
3. Ensure that there is a good seal between the passenger air filter housing and the sheet metal.
4. Install the filter (1) in to the filter housing.
5. Install the filter access cover (1).
6. Install the air inlet grille panel. Refer to «Air Inlet Grille Panel Replacement»(/cadillac/cts/ii-2007-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

1. Remove the air inlet grille panel. Refer to «Air Inlet Grille Panel Replacement»(/cadillac/cts/ii-2007-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
2. With two hands release the tabs on each side of the access cover.
3. Lift up the filter access cover (1).
4. Remove the filter (1) from the filter housing.

1. Install the filter (1) in to the filter housing.
2. Install the filter access cover (1).
3. Install the air inlet grille panel. Refer to «Air Inlet Grille Panel Replacement»(/cadillac/cts/ii-2007-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

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1. Remove the (I/P) - right side insulator panel. Refer to «Instrument Panel Insulator Replacement - Right Side (Left Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
2. Remove the I/P compartment. Refer to «Instrument Panel Compartment Replacement (Left Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
3. Loosen the I/P carrier mounting bolts but do not remove, and reposition the carrier to gain clearance for blower motor removal. Refer to «Instrument Panel Carrier Replacement (Left Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
4. Disconnect the blower motor electrical connector.
5. Remove the screws (1) that retain the blower motor.
6. Remove the blower motor.

1. Install the blower motor.
2. Install the blower motor screws (1) and tighten to 1.5 N.m (13 lb in).
3. Connect the blower motor electrical connector.
4. Install the I/P compartment. Refer to «Instrument Panel Compartment Replacement (Left Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
5. Install the I/P insulator - right side. Refer to «Instrument Panel Insulator Replacement - Right Side (Left Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
6. Install the I/P carrier mounting bolts and tighten to 25 N.m (19 lb ft). Refer to «Instrument Panel Carrier Replacement (Left Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .

1. Remove the left insulator panel. Refer to «Instrument Panel Insulator Replacement - Left Side (Right Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
2. Remove the instrument panel (I/P) compartment. Refer to «Instrument Panel Compartment Replacement (Right Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
3. Loosen the I/P mounting bolts but do not remove, and reposition the I/P carrier to gain clearance for the blower motor removal. Refer to «Instrument Panel Carrier Replacement (Right Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
4. Disconnect the blower motor electrical connector.
5. Disconnect the blower motor processor electrical connector.
6. Remove the screws (1) that retain the blower motor.
7. Remove the blower motor.

1. Install the blower motor.
2. Install the blower motor screws (1) and tighten to 1.5 N.m (13 lb in).
3. Connect the blower motor processor electrical connector.
4. Connect the blower motor electrical connector.
5. Install the I/P compartment. Refer to «Instrument Panel Compartment Replacement (Right Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
6. Install the left insulator panel. Refer to «Instrument Panel Insulator Replacement - Left Side (Right Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
7. Install the I/P carrier mounting bolts and tighten to 25 N.m(19 lb ft). Refer to «Instrument Panel Carrier Replacement (Right Hand Drive)»(/cadillac/cts/ii-2007-2014/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim)

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1. Remove the HVAC module. Refer to «Air Conditioning and Heater Module Assembly Removal and Installation»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-and-heater-module-assembly) .
2. Remove the heater hose bracket screw.
3. Remove the heater hose bracket (1).
4. Slide the heater core out of the HVAC module.

1. Slide the heater core into the HVAC module.
2. Install the heater hose bracket (1).
3. Install the heater hose bracket screw and tighten to 1 N.m (9 lb in).
4. Install the HVAC module. Refer to «Air Conditioning and Heater Module Assembly Removal and Installation»(/cadillac/cts/ii-2007-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-and-heater-module-assembly) .

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 presently the only EPA approved refrigerant for automotive use. R-134a is an 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 compressor and condenser 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 condenser tube, to the thermal expansion valve.

The thermal expansion valve is located in the condenser tube between the condenser and the evaporator. 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 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 and into the compressor hose 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.

Illustration Tool Number/ Description J 38185 Hose Clamp Pliers J 39400-A Halogen Leak Detector J 42220 Universal 12V Leak Detection Lamp J 41447 R-134A A/C Tracer Dye - Box of 24 J 43600 ACR 2000 Air Conditioning Service Center J 43872 Fluorescent Dye Cleaner J 45037 A/C Oil Injector J 45268 A/C Flushing Adapter Kit J 45689 A/C Quick Joint Tool J 46297 A/C Dye Injector Kit J 46297-12 Replacement Dye Cartridges J 39200 Tech 2

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See also:
• Symptoms - HVAC Systems - Automatic
• Moving Parts and Hot Surfaces Warning
• Air Temperature Malfunction
• Cooling System Description and Operation (LF1, LLT)
• Engine Fails To Reach Normal Operating Temperature
• Diagnostic System Check - Vehicle
• Drive Belt Falls Off and Excessive Wear Diagnosis
• Drive Belt Tensioner Diagnosis
• Air Conditioning Compressor and Power Steering Pump Belt Replacement
• Drive Belt Tensioner Removal
• Instrument Panel Carrier Replacement (Left Hand Drive)
• Loss of Coolant
• Oil Leak Diagnosis
• Fluid Leak Diagnosis
• Transmission Fluid Leak Diagnosis
• Power Steering Fluid Leaks
• Afterblow Enabling
• Fastener Caution
• Lifting and Jacking the Vehicle
• Air Cleaner Outlet Duct Replacement (LF1)
• Front Air Deflector Replacement
• Air Conditioning Compressor Belt Replacement
• Engine Splash Shield Replacement
• Air Cleaner Assembly Replacement (LLT)
• Power Steering Fluid Cooler Replacement (V6)
• Battery Replacement
• Cooling System Draining and Filling (GE 47716 LSA)
• Cross Vehicle Brace Replacement
• Air Inlet Grille Panel Replacement
• Radio Control Assembly Replacement (with Navigation Display)
• Rear Floor Panel Carpet Replacement
• Special Tools
• Refrigerant Recovery and Recharging
• Leak Testing
• Air Conditioning (A/C) Diagnostics - Pressure Zone A
• Flushing
• Heating Performance Diagnostic
• Refrigerant System Capacities
• Air Conditioning Compressor Oil Diagnosis
• Air Conditioning Line/Tube Connector Removal/Replacement
• Air Conditioning and Heater Module Assembly Removal and Installation