Heating, Ventilation, and Air Conditioning Buick Enclave I

Fastener Tightening Specifications

Fastener Tightening Specifications

Compressor Suction Screen and Tool Selection Specifications

Compressor Suction Screen and Tool Selection Specifications

Refrigerant System Specifications

Refrigerant System Specifications

Leak Testing

Special Tools

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

Refrigerant Leak Testing

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

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

Verifying some passive leaks may require using the J 39400-A halogen leak detector , even though the A/C system contains fluorescent dye.

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

Fluorescent Leak Detector

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

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

Fluorescent Dye Injection

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

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

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

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

Follow the instructions supplied with the J 39400-A halogen leak detector.

Air Conditioning (A/C) System Performance Test

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

A/C Performance Table

A/C Diagnostics Chart

A/C Diagnostics Chart

Heating Performance Diagnostic

Heating Performance Diagnostic

Defrosting Insufficient

Defrosting Insufficient

Noise Diagnosis - Auxiliary Blower Motor

Noise Diagnosis - Auxiliary Blower Motor

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 mirocbial 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.

Refrigerant Recovery and Recharging

Special Tools

1. J 43600 ACR 2000 Air Conditioning Service Center
2. J 45037 A/C Oil Injector

The J 43600 ACR 2000 air conditioning service center is a complete air conditioning service center for R-134a. The ACR 2000 recovers, recycles, evacuates and recharges A/C refrigerant quickly, accurately and automatically. The unit has a display screen that contains the function controls and displays prompts that will lead the technician through the recover, recycle, evacuate and recharge operations. R-134a is recovered into and charged out of an internal storage vessel. The ACR 2000 automatically replenishes this vessel from an external source tank in order to maintain a constant 5.45-6.82 kg (12-15 lbs) of A/C refrigerant.

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

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

Refer to the J 43600 ACR 2000 air conditioning service center ACR 2000 manual for operation and setup instruction. Always recharge the A/C System with the proper amount of R-134a. Refer to Refrigerant System Specifications 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 A/C oil injector. For the proper quantities of oil to add to the A/C refrigerant system, refer to Refrigerant System Specifications .

Flushing

Tools Required

1. J 43600 ACR 2000 Air Conditioning Service Center
2. J 45268 A/C Flushing Adapter Kit
3. J 41447 Leak Detection Dye
4. J 42220 R-134A A/C Tracer Dye - Box of 24

Flushing is intended to remove the following contaminants

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

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Remove the front thermal expansion valve (TXV). Refer to «Air Conditioning Evaporator Thermal Expansion Valve Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-evaporator-thermal-expansion-valve) .
3. Install the J 45268-121 in place of the TXV.
4. Remove the A/C compressor. Refer to «Air Conditioning Compressor Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
5. Install J 45268-5 to the discharge hose.
6. Install J 45268-4 to the suction hose.
7. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil. Perform the following procedure: IMPORTANT: The filter inside J 45268-1 is serviceable. Remove and discard the check valve from the filter. Service the filter with ACDelco P/N GF 470 before each flush. Connect J 45268-1 to the suction port of J 45268-4. Connect the blue hose from J 43600 ACR 2000 air conditioning service center to J 45268-1 flush filter adapter. Connect the red hose from J 43600 ACR 2000 air conditioning service center to J 45268-5 flush adapter.
8. Reverse flow refrigerant flushing is recommended for desiccant failure. Replace the desiccant when the A/C flush is complete and perform the following procedure: IMPORTANT: The filter inside J 45268-1 is serviceable. Service the filter with ACDelco P/N GF 470 before each flush. Connect J 45268-1 to the discharge port of J 45268-5. Connect the blue hose from J 43600 ACR 2000 air conditioning service center to J 45268-1 flush filter adapter. Connect the red hose from J 43600 ACR 2000 air conditioning service center to the suction port of J 45268-4 flush adapter.
9. Flush the front A/C system. Follow the instructions supplied with the J 43600 ACR 2000 air conditioning service center.
10. If the vehicle is equipped with rear A/C, flush the auxiliary A/C system separately. Remove J 45268-121 from the front evaporator. Inspect the front TXV for debris. Clean or replace as needed. Install the front TXV. Refer to «Air Conditioning Evaporator Thermal Expansion Valve Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-evaporator-thermal-expansion-valve) . Install J 45268-121 in place of the auxiliary TXV.
11. Flush the auxiliary A/C system. Follow the instructions supplied with J 43600 ACR 2000 air conditioning service center.
12. Remove J 45268-5 from the discharge hose.
13. Remove J 45268-4 from the suction hose.
14. If the removed A/C compressor is being reinstalled, perform the following procedure: Drain 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 to the A/C compressor. Refer to «Refrigerant System Specifications»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-specifications) .
15. If you will replace the A/C compressor after flushing the system, perform the following procedure: A new service compressor is shipped with PAG oil. Refer to the «Refrigerant System Specifications»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-specifications) . If the service compressor is shipped with PAG oil, DO NOT drain the new PAG oil from the compressor. Deduct the amount of PAG oil shipped with the service compressor from the amount of PAG oil listed in the capacities table. Refer to «Refrigerant System Specifications»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-system-specifications) . Add the calculated amount to the compressor, as needed.
16. Add one bottle of J 41447 leak detection dye directly to the A/C compressor.
17. Install the A/C compressor. Refer to «Air Conditioning Compressor Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
18. Remove J 45268-121.
19. Inspect the auxiliary TXV for debris. Clean or replace as needed.
20. Install the auxiliary TXV. Refer to «Auxiliary Air Conditioning Evaporator Thermal Expansion Valve Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
21. Evacuate and recharge the A/C system. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
22. Leak test the fittings using J 42220 R-134A A/C Tracer Dye - Box of 24.

Draining Procedure

1. 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.
2. Measure and record the amount of oil drained from the removed compressor. This measurement will be used during installation of the replacement compressor.
3. Inspect the oil drained from the compressor. Refer to «Air Conditioning Compressor Oil Diagnosis»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-compressor-oil-diagnosis) .
4. Properly discard the used refrigerant oil.

Balancing Procedure

1. The replacement compressor is shipped with 74 ml (2.5 oz) of refrigerant oil.
2. Compare the amount of refrigerant oil recorded during compressor removal to the amount of refrigerant oil shipped in the replacement compressor. If the amount of refrigerant oil drained and recorded from the removed compressor is: Less than 74 ml (2.5 oz) Leave the 74 ml (2.5 oz) in the replacement compressor. More than 74 ml (2.5 oz) Add to the compressor the difference between the 74 ml (2.5 oz) and the amount drained.

Scheme 1

Air Conditioning Compressor Replacement

Removal Procedure

1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the drive belt. Refer to «Drive Belt Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
3. Remove the clutch plate retaining bolt (1).
4. Remove the clutch plate assembly (2).
5. Remove the clutch hub/bearing snap ring (3).
6. Remove the clutch hub/bearing assembly (4).
7. Remove clutch coil harness retainer.
8. Remove the snap ring (5) from the clutch coil (6).
9. Remove the clutch coil (6) from the A/C compressor (7).

Installation Procedure

1. Install the clutch coil (6) to the A/C compressor (7).
2. Install the snap ring (5) to the clutch coil (6).
3. Install clutch coil harness retainer.
4. Install the clutch hub/bearing assembly (4).
5. Install the clutch hub/bearing snap ring (3).
6. Place a small amount of oil on the thinnest air gap shim and place it inside the clutch plate.
7. Install the clutch plate assembly.
8. Measure the air gap between the pulley and the drive plate. Adjust the shims to achieve a 0.35-0.65 mm (0.014-0.026 in) air gap.
9. Install the clutch plate retaining bolt. Tighten Tighten the bolt to 18 N.m (13 lb ft).
10. Install the drive belt. Refer to «Drive Belt Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
11. Lower the vehicle.

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

1. Inspect the new seal washer for any signs of cracks, cuts, or damage. Do not use a damaged seal washer.
2. Using a lint-free clean, dry cloth, clean the sealing surfaces of the A/C refrigerant components.
3. Carefully install the new seal washer onto the A/C refrigerant component.
4. The washer must completely bottom against the surface of the fitting.
5. Assemble the remaining A/C refrigerant components. Refer to the appropriate repair procedure.

1. Disassemble the A/C refrigerant components. Refer to the appropriate repair procedure For compression style fittings use a back up wrench on the fitting (2) and loosen the fitting nut (1). For banjo style fittings remove the bolt retaining the banjo type fitting.
2. Remove the O-ring seal from the A/C refrigerant component.
3. Inspect the O-ring seal for signs of damage.
4. Inspect the A/C refrigerant components for damage or burrs. Repair if necessary.
5. Discard the O-ring seal.

1. Inspect the new O-ring seal for any sign or cracks, cuts, or damage. Replace if necessary.
2. Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the A/C refrigerant components.
3. Lightly coat the new O-ring seal with mineral base 525 viscosity refrigerant oil.
4. Carefully slide the new O-ring seal onto the A/C refrigerant component.
5. The O-ring seal must be fully seated.
6. Assemble the A/C components. Refer to the appropriate repair procedure. For compression style fittings use a back up wrench on the fitting (2) and tighten the fitting nut (1) to specification. For banjo style fittings install the bolt retaining the banjo type fitting and tighten to specification.

Discharge Hose Replacement

Tools Required

J 39400-A Halogen Leak Detector

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Remove front facia. Refer to «Front Bumper Fascia Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) , «Front Bumper Fascia Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) , «Front Bumper Fascia Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) .
3. Remove front bumper upper fascia support. Refer to «Front Bumper Fascia Upper Support Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) , «Front Bumper Fascia Upper Support Replacement (Acadia and Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) .
4. Remove the electrical connector from the A/C pressure switch.
5. Remove the discharge line bolt from the A/C compressor (1).
6. Disconnect the discharge line from the A/C compressor (3).
7. Remove the discharge line to condenser bolt (1).
8. Disconnect the discharge line from the condenser (3).
9. Remove the discharge line.
10. Remove the A/C pressure switch. Refer to «Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
11. Remove and discard the discharge line O-rings (2).

1. Install new O-rings to the discharge line (2). Refer to «Air Conditioning O-Ring Seal Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. Install the A/C pressure switch. Refer to «Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
3. Connect the discharge line to the condenser (3).
4. Install the discharge line to condenser bolt (1). Tighten Tighten the bolt to 9 N.m (80 lb in).
5. Connect the discharge line to the A/C compressor (3).
6. Install the discharge line bolt to the A/C compressor (1). Tighten Tighten the bolt to 9 N.m (80 lb in).
7. Install front bumper upper fascia support. Refer to «Front Bumper Fascia Upper Support Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) , «Front Bumper Fascia Upper Support Replacement (Acadia and Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) .
8. Install front facia. Refer to «Front Bumper Fascia Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) , «Front Bumper Fascia Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) , «Front Bumper Fascia Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) .
9. Evacuate and recharge the refrigerant system. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
10. Leak test the fittings of the component using J 39400-A halogen leak detector.

Suction Hose Replacement

Special Tools

J 39400-A Halogen Leak Detector

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Remove the suction hose bracket nut (1) and remove bracket.
4. Remove the suction hose/pipe bolt from the A/C compressor.
5. Disconnect the suction hose/pipe from the A/C compressor.
6. Remove the suction hose/pipe nut (1) from TXV tube.
7. Disconnect the suction hose/pipe from the TXV tube (2).
8. Remove the suction hose/pipe.
9. Remove and discard the suction hose/pipe O-rings.

1. Install new O-rings to the suction hose/pipe. Refer to «Air Conditioning O-Ring Seal Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. Connect the suction hose/pipe to the TXV tube.
3. Install the suction hose/pipe to TXV nut (1). Tighten Tighten the bolt to 9 N.m (80 lb in).
4. Connect the suction hose/pipe to the A/C compressor.
5. Install the suction hose/pipe bolt to the A/C compressor. Tighten Tighten the bolt to 9 N.m (80 lb in).
6. Install the suction hose/pipe bracket and secure with nut (1).
7. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
8. Evacuate and recharge the refrigerant system. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
9. Leak test the fittings of the component using J 39400-A halogen leak detector.

Air Conditioning Condenser and Air Conditioning Evaporator Tube Replacement

Tools Required

J 39400-A Halogen Leak Detector

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Remove injector sight shield.
3. Remove right engine mount strut. Refer to «Engine Mount Strut Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
4. Remove underhood electrical center. Refer to «Underhood Electrical Center or Junction Block Replacement»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) .
5. Remove underhood electrical center bracket.
6. Reposition wiring harness as required.
7. Remove front bumper upper facia support. Refer to «Front Bumper Fascia Upper Support Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) , «Front Bumper Fascia Upper Support Replacement (Acadia and Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) .
8. Remove the liquid line bolt from the A/C condenser (1).
9. Disconnect the liquid line from the A/C condenser (2).
10. Remove the liquid line to auxiliary tube nut (1).
11. Remove TXV tube retainer nut (1).
12. Disconnect the liquid line (2) and evaporator hose/tube from the TXV at plenum panel.
13. Remove the attaching liquid line clamp nuts along right inner frame rail and plenum panel (1).
14. Remove the liquid line bracket bolt at right side of upper tie bar support (2).
15. Remove the liquid line.
16. Remove and discard the discharge line sealing washer.

1. Install new sealing washers to the liquid line. Refer to «Air Conditioning System Seal Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. Connect the liquid line (2) and evaporator hose/tube to the TXV at plenum panel.
3. Install the liquid line to TXV nut (1). Tighten Tighten the bolt to 9 N.m (80 lb in).
4. Connect the liquid line to the auxiliary evaporator tube.
5. Install the liquid line nut (1). Tighten Tighten the bolt to 9 N.m (80 lb in).
6. Install the liquid line to the condenser (2).
7. Install the liquid line nut (1). Tighten Tighten the bolt to 9 N.m (80 lb in).
8. Install liquid line bracket bolt to upper tie bar support (2). Tighten Tighten the bolt to 9 N.m (80 lb in).
9. Install the liquid line bracket nuts along frame rail and plenum panel (1). Tighten Tighten the bolt to 4 N.m (35 lb in).
10. Install underhood electrical center bracket.
11. Install underhood electrical center. Refer to «Underhood Electrical Center or Junction Block Replacement»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) .
12. Install front bumper upper facia support. Refer to «Front Bumper Fascia Upper Support Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) , «Front Bumper Fascia Upper Support Replacement (Acadia and Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) .
13. Install right engine mount strut. Refer to «Engine Mount Strut Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
14. Install injector sight shield.
15. Evacuate and recharge the refrigerant system. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
16. Leak test the fittings of the component using J 39400-A halogen leak detector.

Scheme 2

Air Conditioning (AC) Refrigerant Filter Replacement (Auxiliary)

Suction Screen Installation

Special Tools

J 44551 Suction Screen Kit

1. Remove the A/C suction hose from the A/C compressor. Refer to «Suction Hose Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__suction-hose-replacement) .
2. Using a caliper that reads to 3 decimal places, measure the ID of the suction hose or manifold suction fitting. To determine the correct size screen for the application, refer to «Compressor Suction Screen and Tool Selection Specifications»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__compressor-suction-screen-and-tool-selection) .
3. Select and install the correct mandrel (1) on the threaded portion of the installation tool bolt: The brass Universal Mandrel is for use on hose fittings with a smooth bore where the screen installs flush with the end of the fitting. The 11.96 mm (0.471 in) Mandrel is only for the 11.96 mm (0.471 in) screen in hose fittings with an internal hourglass shape where the screen installs at the recessed, reduced diameter point.
4. Install the 11.96 mm (0.471 in) screen in the middle of the reduced diameter point of the fitting.
5. Place the suction hose fitting or suction hose side of the manifold into the installation tool fixture J-44551-5 (3) so it is supported by the tools legs.
6. Lubricate the A/C suction screen with the applicable refrigerant oil.
7. Align the screen (2), basket first; into the suction hose bore then hand tighten the bolt until contact is made between the hose, screen and tool.
8. Turn the bolt of the installation tool clockwise pressing the screen into the bore until the mandrel shoulder contacts the end of the hose fitting.
9. Unscrew the bolt and remove the installation tool from the hose or manifold.
10. Install the J-44551-1 Suction Screen Notification Label.
11. Install the A/C hose to the A/C compressor. Refer to «Suction Hose Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__suction-hose-replacement) .

Air Conditioning Compressor Suction Screen Replacement

Tools Required

J 44551 Suction Screen Kit

1. Remove the A/C suction hose from the A/C compressor. Refer to «Suction Hose Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__suction-hose-replacement) .
2. Using the J-44551-9 Universal Removal Tool, place the tip of the tool under the inside edge of the compression band of the suction screen and the cushioning fulcrum pad against the open end of the hose or manifold fitting.
3. Pry upward on the band and move the tool around the diameter of the screen as necessary to remove the screen.

1. Using a caliper that reads to 3 decimal places, measure the ID of the suction hose or manifold suction fitting. To determine the correct size screen for the application, refer to «Compressor Suction Screen and Tool Selection Specifications»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__compressor-suction-screen-and-tool-selection) .
2. Select and install the correct mandrel (1) on the threaded portion of the installation tool bolt: The brass Universal Mandrel is for use on hose fittings with a smooth bore where the screen installs flush with the end of the fitting. The 11.96 mm (0.471 in) Mandrel is only for the 11.96 mm (0.471 in) screen in hose fittings with an internal hourglass shape where the screen installs at the recessed, reduced diameter point.
3. Install the 11.96 mm (0.471 in) screen in the middle of the reduced diameter point of the fitting.
4. Place the suction hose fitting or suction hose side of the manifold into the installation tool fixture J-44551-5 (3) so it is supported by the tools legs.
5. Lubricate the A/C suction screen with the applicable refrigerant oil.
6. Align the screen (2), basket first; into the suction hose bore then hand tighten the bolt until contact is made between the hose, screen and tool.
7. Turn the bolt of the installation tool clockwise pressing the screen into the bore until the mandrel shoulder contacts the end of the hose fitting.
8. Unscrew the bolt and remove the installation tool from the hose or manifold.
9. Install the J-44551-1 Suction Screen Notification Label.
10. Install the A/C hose to the A/C compressor. Refer to «Suction Hose Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__suction-hose-replacement) .

Service Ports Replacement

Tools Required

1. J 39400-A Halogen Leak Detector
2. J 46246 Valve Core Removal Tool

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Use J 46246 valve core removal tool or equivalent to remove the valve core.

1. Use J 46246 valve core removal tool or equivalent to install and tighten the valve core.
2. Evacuate and charge the A/C system. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
3. Test the affected A/C fittings for leaks using J 39400-A halogen leak detector.

Scheme 3

Air Conditioning Refrigerant Desiccant Replacement

Air Conditioning Evaporator Thermal Expansion Valve Replacement

Special Tools

J 39400-A Halogen Leak Detector

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. If equipped, remove the windshield washer solvent heater. Refer to «Windshield Washer Solvent Heater Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) , «Windshield Washer Solvent Heater Replacement (Acadia and Enclave)»(/buick/enclave/i-2007-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
4. Remove the evaporator thermal expansion valve (TXV) tube from the TXV.
5. Remove and discard the seal washers.
6. Remove the TXV bolts.
7. Remove the TXV.
8. Remove and discard the seal washers.

1. Install the TXV seal strip. The center of the seal strip should cover the dome at the top of the TXV and then down both sides of the TXV.
2. Install new seal washers to the evaporator core fittings. Refer to «Air Conditioning System Seal Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
3. Install the TXV.
4. Install the TXV bolts. Insert a small phillips screwdriver through one of the TXV bolt holes and into the threaded hole of the mounting plate. Install the TXV bolt into the other hole without the screwdriver. Remove the screwdriver and install the other TXV bolt. Tighten Tighten the bolts to 5 N.m (44 lb in).
5. Install new sealing washers on the evaporator TXV tube fittings. Refer to «Air Conditioning System Seal Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
6. Install the condenser tube and evaporator hose to the TXV.
7. Install the TXV nut. Tighten Tighten the nut to 20 N.m (15 lb ft).
8. Evacuate and charge the refrigerant system. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
9. If removed, install the windshield washer solvent heater. Refer to «Windshield Washer Solvent Heater Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) , «Windshield Washer Solvent Heater Replacement (Acadia and Enclave)»(/buick/enclave/i-2007-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
10. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
11. Leak test the fittings using the J 39400-A halogen leak detector.

Scheme 4

Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement

Scheme 5

Evaporator Air Temperature Sensor Replacement

Scheme 6

Air Conditioning Condenser Replacement (Enclave)

Air Conditioning Condenser Replacement (Acadia, Traverse)

Air Conditioning Condenser Replacement (Acadia, Traverse)

Scheme 7

Air Conditioning and Heater Module Assembly Removal and Installation

Scheme 8

Air Conditioning Evaporator Core Replacement

Scheme 9

Air Conditioning Evaporator and Blower Module Drain Hose Replacement

Scheme 10

Heater Inlet Hose Replacement

Scheme 11

Heater Outlet Hose Replacement

Scheme 12

Heater Core Tube Replacement

Scheme 13

Air Inlet Screen Cleaning

Scheme 14

Passenger Compartment Air Filter Housing Replacement

Scheme 15

Blower Motor Control Module Replacement

Scheme 16

Blower Motor Replacement

Scheme 17

Side Window Defogger Outlet Grille Replacement - Left Side (Enclave)

Scheme 18

Side Window Defogger Outlet Grille Replacement - Left Side (Traverse)

Scheme 19

Side Window Defogger Outlet Grille Replacement - Right Side (Traverse)

Scheme 20

Side Window Defogger Outlet Grille Replacement - Right Side (Enclave)

Scheme 21

Air Distributor Case Replacement

Scheme 22

Side Window Air Outlet Replacement (Acadia)

Scheme 23

Instrument Panel Outer Air Outlet Replacement - Left Side (Acadia)

Scheme 24

Instrument Panel Outer Air Outlet Replacement - Left Side (Enclave)

Scheme 25

Instrument Panel Outer Air Outlet Replacement - Left Side (Traverse)

Scheme 26

Instrument Panel Center Air Outlet Replacement (Enclave)

Scheme 27

Instrument Panel Center Air Outlet Replacement (Traverse)

Scheme 28

Instrument Panel Center Air Outlet Replacement (Acadia)

Scheme 29

Instrument Panel Outer Air Outlet Replacement - Right Side (Acadia)

Scheme 30

Instrument Panel Outer Air Outlet Replacement - Right Side (Enclave)

Scheme 31

Instrument Panel Outer Air Outlet Replacement - Right Side (Traverse)

Scheme 32

Floor Air Outlet Duct Replacement - Left Side

Scheme 33

Windshield Defroster Duct Replacement

Scheme 34

Side Window Defogger Outlet Duct Replacement - Left Side

Scheme 35

Side Window Defogger Outlet Duct Replacement - Right Side

Floor Air Outlet Duct Replacement - Right Side

Floor Air Outlet Duct Replacement - Right Side

Scheme 36

Rear Floor Auxiliary Air Outlet Duct Replacement

Scheme 37

Heater Core Cover Replacement

Scheme 38

Heater Core Replacement

1. Drain the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (Vac N Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Before removing the quick connect fitting from the vehicle, clean area and remove any loose dirt or debris.
3. Remove the fitting from the tube by squeezing the retainer clip legs together and pulling the fitting from the tube.
4. Remove the retainer from the tube by folding the legs back on themselves and sliding the retainer clip out of the tube (1).
5. Place a flat-blade tool through the window of the quick connect fitting to just below the outer bushing and above the top O-ring (2).
6. Remove the outer bushing with a gentle prying motion. Discard the outer bushing.
7. Remove other components and discard.
8. Thoroughly clean and inspect the inside surface of the fitting for nicks, scratches or cracks. Remove any dirt or debris using water and a lint free cloth.

1. Lubricate O-rings with coolant.
2. Install the first O-ring and gently push down into the O-ring pocket (4).
3. Install the midspacer and gently push down to first O-ring (3).
4. Install the second O-ring and gently push down to the top of midspacer (2).
5. Install the retainer clip by lining up the retainer legs with windows on the fitting housing (1). Push the retainer clip down until the retainer clip legs are engaged into the windows.
6. Clean and inspect the pipe end for any nicks, scratches or cracks.
7. Install the fitting to the vehicle by pushing the fitting onto the tube until an audible click is heard. Pull back to verify the connection is secure.
8. Fill the cooling system. Refer to «Cooling System Draining and Filling (Static Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (Vac N Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .

Scheme 39

Auxiliary Blower Control Module Replacement

Scheme 40

Auxiliary Blower Motor Replacement

Scheme 41

Auxiliary Heater Air Outlet Duct Replacement

Scheme 42

Auxiliary Air Conditioning Air Outlet Duct Replacement

Scheme 43

Auxiliary Heater Core Replacement

Scheme 44

Auxiliary Heater Core Tube Replacement

Scheme 45

Auxiliary Air Conditioning Evaporator Thermal Expansion Valve Replacement

Auxiliary HVAC Module Removal and Installation

Tools Required

J 39400-A Halogen Leak Detector

1. Recover the refrigerant from the air conditioning (A/C) system. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Drain the engine coolant. Refer to «Cooling System Draining and Filling (Static Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (Vac N Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
4. Remove the right rear wheelhouse liner panel. Refer to «Rear Wheelhouse Panel Liner Replacement»(/buick/enclave/i-2007-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
5. Disconnect the heater lines (2, 3) from the auxiliary HVAC module at the underside of the vehicle.
6. Disconnect the air conditioning lines (4, 5) from the auxiliary HVAC module at the underside of the vehicle.
7. Remove the nuts (6) from the studs (1) that secure the auxiliary HVAC module to the underside of the vehicle.
8. Lower the vehicle.
9. Remove the right rear quarter trim panel. Refer to «Quarter Lower Rear Trim Panel Replacement (Acadia with TB5)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling__quarter-lower-rear-trim-panel-replacement) , «Quarter Lower Rear Trim Panel Replacement (Traverse with TB5)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) , «Quarter Lower Rear Trim Panel Replacement (Traverse with TB4)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) , «Quarter Lower Rear Trim Panel Replacement (Enclave with TB5)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) , «Quarter Lower Rear Trim Panel Replacement (Acadia with TB4)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling__quarter-lower-rear-trim-panel-replacement) , «Quarter Lower Rear Trim Panel Replacement (Enclave with TB4)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
10. Disconnect the electrical connectors from the auxiliary HVAC module.
11. Remove the upper auxiliary air distributor duct (2). Refer to «Auxiliary Air Conditioning Air Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
12. Remove the lower auxiliary air distributor duct (2). Refer to «Auxiliary Heater Air Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
13. Remove the fasteners (3) retaining the auxiliary HVAC module to the vehicle.
14. Remove the auxiliary HVAC module (4) from the vehicle.

1. Install the auxiliary HVAC module assembly (4) to the vehicle.
2. Install the 2 bolts (3) inside the vehicle in order to retain the auxiliary HVAC module to the vehicle.
3. Install the upper auxiliary air distributor duct. Refer to «Auxiliary Air Conditioning Air Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
4. Install the lower auxiliary air distributor duct. Refer to «Auxiliary Heater Air Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
5. Connect the electrical connectors to the auxiliary HVAC module.
6. Install the right rear quarter trim panel. Refer to «Quarter Lower Rear Trim Panel Replacement (Acadia with TB5)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling__quarter-lower-rear-trim-panel-replacement) , «Quarter Lower Rear Trim Panel Replacement (Traverse with TB5)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) , «Quarter Lower Rear Trim Panel Replacement (Traverse with TB4)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) , «Quarter Lower Rear Trim Panel Replacement (Enclave with TB5)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) , «Quarter Lower Rear Trim Panel Replacement (Acadia with TB4)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling__quarter-lower-rear-trim-panel-replacement) , «Quarter Lower Rear Trim Panel Replacement (Enclave with TB4)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
7. Raise the vehicle.
8. Install the nuts that secure the auxiliary HVAC module to the vehicle. CAUTION: Refer to «Fastener Caution»(/buick/enclave/i-2007-2013/remont/oem-general-information/#dangers-warnings-and-cautions__fastener-caution) . Tighten Tighten the nuts to 9 N.m (80 lb in).
9. Install the air conditioning lines (4, 5) and the nut (6) to the auxiliary HVAC module. Tighten Tighten the nut to 16 N.m (12 lb ft).
10. Install the heater lines (2, 3) to the auxiliary HVAC module at the underside of vehicle.
11. Install the right rear wheelhouse liner panel. Refer to «Rear Wheelhouse Panel Liner Replacement»(/buick/enclave/i-2007-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
12. Lower the vehicle.
13. Fill the engine coolant. Refer to «Cooling System Draining and Filling (Static Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (Vac N Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
14. Recharge the refrigerant to the system. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
15. Leak test the fittings of the component using the J 39400-A halogen leak detector.

Scheme 46

Auxiliary Air Conditioning Evaporator Replacement

Auxiliary Air Conditioning Evaporator Tube Replacement

Special Tools

J 39400-A Halogen Leak Detector

1. Recover the refrigerant from the system. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
3. Remove the right rear inner wheelhouse liner if necessary. Refer to «Rear Wheelhouse Panel Liner Replacement»(/buick/enclave/i-2007-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
4. Remove auxiliary evaporator tube nut (1) and pull downward to release the auxiliary A/C evaporator tubes (2) from the auxiliary HVAC module (4).
5. Remove auxiliary evaporator tube clip nuts (3) and release tubes from clips.
6. Remove air cleaner duct. Refer to «Air Cleaner Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
7. Remove the retaining nuts (1) and the auxiliary A/C evaporator tubes (2) from the TXV tube and condenser tube.
8. Remove the heater/A/C tubes retaining nuts (1) from the retaining studs and clips along the frame in four places.
9. Remove the auxiliary A/C evaporator tubes (3) from the clamps (2).
10. Remove the auxiliary A/C evaporator tubes from the vehicle.

Note. The replacement A/C and heater pipes are shipped in two sections and spliced together upon installation. Refer to Auxiliary Heater and Air Conditioning Pipe Replacement/Repair .

1. Install the auxiliary A/C evaporator tubes to the vehicle.
2. Install the auxiliary A/C evaporator tubes (3) to the clamps (2).
3. Install the heater/A/C tubes retaining nut (1) to the retaining studs and clips (2) along the frame in four places. Tighten Tighten the nut to 7 N.m (62 lb in).
4. Install the auxiliary A/C evaporator tubes (2) to the TXV tube and condenser tube and install the retaining nuts (1). Tighten Tighten the nut to 16 N.m (12 lb ft).
5. Install air cleaner duct. Refer to «Air Cleaner Outlet Duct Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
6. Install the auxiliary A/C evaporator tubes (2) to the HVAC module (4) and install retaining nut (1). Tighten Tighten the nuts to 16 N.m (12 lb ft).
7. Install auxiliary evaporator tubes to retaining clips and install nuts (3) to secure. Tighten Tighten the nuts to 4 N.m (35 lb in).
8. Install the right rear inner wheelhouse liner if necessary. Refer to «Rear Wheelhouse Panel Liner Replacement»(/buick/enclave/i-2007-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
9. Lower the vehicle.
10. Recharge the refrigerant to the system. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
11. Leak test the fittings of the component using the J 39400-A halogen leak detector.

Auxiliary Heater and Air Conditioning Pipe Replacement/Repair

Tools Required

J 41425 A/C Line Repair Kit

The rear AC or Heater lines can be repaired in sections.

Replacement lines through GMSPO contain all 4 lines in two sections.

Use the J 41425 A/C line repair kit when any of the following actions damage the rear A/C or heater lines

1. Rub-through
2. Collision damage
3. Leakage in the system

Minimum Tube Length Required Table

Follow the Straight Line Repair procedure in order to repair line damage in a straight section of line.

Follow the Line Sectioning Repair procedure in order to repair any damage in a bend area. Do not repair the rear A/C or heater lines in a bend area, replace the lines. Maintaining the original line shape will prevent vibrations and rub-through.

Straight Line Repair

1. Recover the refrigerant, if repairing the A/C lines. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Drain the coolant, if repairing the heater lines. Refer to «Cooling System Draining and Filling (Static Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (Vac N Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
4. Locate the area that requires repair.
5. Obtain a length of replacement line to make the repair.
6. Use a tubing cutter in order to cut and remove the section of damaged line.
7. Use a tubing cutter in order to cut the replacement line to length.
8. Use the cleaning pad from the J 41425 A/C line repair kit in order to clean any burrs or grease from the line ends. Be sure to clean at least 19 mm (0.75 in) from the line ends.
9. Use the LOK prep sealant in order to prep the line ends.
10. Apply one drop of the J 41425-3 sealing compound to the outside of each end of the line.
11. Insert the line ends into the LOK fitting.
12. Rotate the LOK fitting one complete turn in order to evenly distribute the sealing compound around the lines.
13. Install the correct LOK fitting jaws into the J 41425-1 tool.
14. Install the J 41425-1 tool over the LOK connectors. Verify that the LOK connector ends are positioned in the counter bores of the jaws.
15. Tighten the forcing screw of the J 41425-1 tool. When fully seated, the LOK connector collars will bottom out on the center shoulder of the LOK fitting.
16. Loosen the forcing screw and remove the J 41425-1 tool from the repaired line.
17. Repeat Steps 8-16 to repair the other end of the line.
18. Verify that the LOK fittings are correctly installed.
19. Lower the vehicle.
20. Refill the coolant, if drained. Refer to «Cooling System Draining and Filling (Static Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (Vac N Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
21. Evacuate and recharge the refrigerant, if repairing the A/C lines. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .

Line Sectioning Repair

1. Recover the refrigerant, if repairing the A/C lines. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .
2. Drain the coolant, if repairing the heater lines. Refer to «Cooling System Draining and Filling (Static Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (Vac N Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
4. Obtain a new A/C or heater line for sectioning.
5. Scribe a mark on the line that will be sectioned.
6. Use a tubing cutter in order to cut the line or lines being replaced.
7. Remove the section of line being replaced from the vehicle.
8. Install the replacement line to the vehicle.
9. Use a tubing cutter in order to cut the replacement line to length.
10. Use the cleaning pad from the J 41425 A/C line repair kit in order to clean any burrs or grease. Be sure to clean at least 19 mm (0.75 in) from the A/C line.
11. Use the LOK prep sealant in order to prep the A/C or heater line.
12. Apply one drop of the J 41425-3 sealing compound to the outside of each line end.
13. Insert the line ends into the LOK fitting.
14. Rotate the LOK fitting one complete turn in order to evenly distribute the sealing compound around the lines.
15. Install the correct LOK fitting jaws into the J 41425-1 tool.
16. Install the J 41425-1 tool over the LOK connectors. Verify that the LOK connector ends are positioned in the counter bores of the jaws.
17. Hold the tool body with a 3/8-inch breaker bar. Turn the forcing screw until both of the connector collars bottom on the center shoulder of the LOK fitting.
18. Loosen the forcing screw. Remove the tool from the repaired line.
19. Verify that the LOK fitting is correctly installed.
20. Lower the vehicle.
21. Refill the coolant, if drained. Refer to «Cooling System Draining and Filling (Static Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (Vac N Fill)»(/buick/enclave/i-2007-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
22. Evacuate and recharge the refrigerant, if repairing the A/C lines. Refer to «Refrigerant Recovery and Recharging»(/buick/enclave/i-2007-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging) .

Engine Coolant

Engine coolant is the key element of the heating system. The engine thermostat controls the normal 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 ambient air drawn through the HVAC module absorbs the heat of the coolant flowing through the heater core. The HVAC module distributes heated air to the passenger compartment for consistent passenger comfort. Opening or closing the HVAC module temperature door controls the amount of heat delivered to the passenger compartment. The coolant exits the heater core through the return heater hose and is recirculated back through the engine cooling system.

A/C Cycle

The auxiliary A/C system operates from the vehicles primary A/C system. The front or primary A/C system must be ON to allow the rear A/C system to function.

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 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 liquid line. The liquid line is split and the liquid refrigerant flows to both the front and rear thermal expansion valves.

There is a front and rear thermal expansion valve that is attached to the front and rear evaporators. 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 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 J 6083 External Snap Ring Pliers J 37872 Universal Spanner Wrench J 38185 Hose Clamp Pliers J 39400-A Halogen Leak Detector J 41425 A/C Line Repair Kit J 41447 R-134A A/C Tracer Dye- Box of 24 J 42220 Universal 12V Leak Detection Lamp J 43600 ACR 2000 Air Conditioning Service Center J 43872 Fluorescent Dye Cleaner J 44551 Suction Screen Installation/Removal Kit J 45037 A/C Oil Injector J 45268 A/C Flushing Adapter Kit J 46246 Valve Core Tool J 46297 A/C Dye Injector Kit J 46297-12 Replacement Dye Cartridges

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See also:
• Symptoms - HVAC Systems - Manual
• Symptoms - HVAC Systems - Automatic
• Moving Parts and Hot Surfaces Warning
• Diagnostic System Check - Vehicle
• Engine Fails To Reach Normal Operating Temperature
• Air Conditioning Compressor Malfunction
• Drive Belt Falls Off and Excessive Wear Diagnosis
• Drive Belt Tensioner Diagnosis
• Oil Leak Diagnosis
• Drive Belt Replacement
• Vibration Analysis - Engine
• Instrument Panel Carrier Replacement
• Loss of Coolant
• Oil Consumption Diagnosis
• Fluid Leak Diagnosis
• Lifting and Jacking the Vehicle
• Front Wheelhouse Front Liner Replacement (Enclave - Acadia)
• Fastener Caution
• Front Bumper Fascia Replacement (Enclave)
• Air Cleaner Outlet Duct Replacement
• Underhood Electrical Center or Junction Block Replacement
• Windshield Washer Solvent Heater Replacement (Traverse)
• Cooling System Draining and Filling (Static Fill)
• Instrument Panel Trim Pad Replacement (Enclave)
• Actuator Recalibration
• Rear Floor Panel Carpet Replacement
• Quarter Lower Rear Trim Panel Replacement (Acadia with TB5)
• Quarter Lower Rear Trim Panel Replacement (Traverse with TB5)
• Refrigerant Recovery and Recharging
• Leak Testing
• A/C Diagnostics Chart
• Heater Core Replacement
• Air Conditioning (A/C) System Performance Test
• Heating Performance Diagnostic
• Refrigerant System Specifications
• Air Conditioning Evaporator Thermal Expansion Valve Replacement
• Air Conditioning Compressor Oil Diagnosis
• Suction Hose Replacement
• Discharge Hose Replacement
• Suction Screen Installation
• Auxiliary Air Conditioning Evaporator Tube Replacement
• Compressor Suction Screen and Tool Selection Specifications
• Air Conditioning Condenser and Air Conditioning Evaporator Tube Replacement
• Auxiliary HVAC Module Removal and Installation
• Auxiliary Heater and Air Conditioning Pipe Replacement/Repair