Heating, Ventilation, and Air Conditioning Buick Encore I

Fastener Tightening Specifications

Fastener Tightening Specifications

Adhesives, Fluids, Lubricants, and Sealers

Adhesives, Fluids, Lubricants, and Sealers

Refrigerant System Specifications

Refrigerant System Capacities

Leak Testing

Special Tools

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

For equivalent regional tools, refer to Special Tools .

Refrigerant Leak Testing

Note. These vehicles are not now manufactured with fluorescent dye installed directly into the air conditioning (A/C) system. Therefore, if refrigerant leak testing is required, add florescent dye into the air conditioning (A/C) system.

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

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

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 BO-42220 lamp.
4. To prevent false diagnosis in the future, thoroughly clean the residual dye from any area where leaks were found. Use a rag and the approved GE-43872 cleaner.

Fluorescent Dye Injection

Note. Use only fluorescent dye approved by General Motors.

Note. Do NOT overcharge the A/C system with dye.

1. GE-41447 dye can be poured directly into a removed A/C component.
2. GE-46297-12 dye cartridge is injected into the low side port using GE-46297 injector kit.
3. 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.
4. 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.
5. To prevent false diagnosis, thoroughly clean any residual dye from the service port with a rag and the approved fluorescent dye cleaner GE-43872 dye cleaner.

Halogen Leak Detector

Ensure that the vehicle has at least 0.45 kg (1 lb) of refrigerant in the A/C refrigeration system in order to perform a leak test. Refer to Refrigerant Recovery and Recharging (R-134a) for recharging the A/C system.

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

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

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

Follow the instructions supplied with the GE-39400-A 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 - 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

1. Odors may be emitted from the air conditioning system primarily at start up in hot, humid climates. The following conditions may cause the odor: Debris is present in the HVAC module assembly. Microbial growth on the evaporator core.
2. 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 addressed. Perform the following procedure: Remove evaporator core. Refer to «Air Conditioning Evaporator Replacement»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) . Clean evaporator core with a solution of 40% vinegar and 60% water. Refit evaporator core. Refer to «Air Conditioning Evaporator Replacement»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

Refrigerant Recovery and Recharging (R-134a)

The A/C service station is a complete air conditioning service center for refrigerant. The service station 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. A/C refrigerant is recovered into and charged out of an internal storage vessel.

The A/C service station 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 station will not recover the refrigerant from the A/C system.

For information on the actual equipment, please refer to the manual of the equipment in question.

Always recharge the A/C System with the proper amount of refrigerant. 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. For the proper quantities of oil to add to the A/C refrigerant system, refer to Refrigerant System Specifications .

Draining Procedure

1. Before draining oil, position the compressor vertically, (clutch facing upwards) and let the air conditioning compressor sit for 1 minute.
2. Position the air conditioning compressor horizontally with the ports facing downward, rotate the clutch and shake the air conditioning compressor in order to remove as much oil from the air conditioning compressor as possible.
3. Drain the oil from both the suction and discharge ports of the removed air conditioning compressor into a clean, graduated container. Rotate the air conditioning compressor shaft to assist in draining the air conditioning compressor.
4. Measure and record the amount of oil drained from the removed air conditioning compressor. This measurement will be used during installation of the replacement air conditioning compressor. Inspect oil drained from removed air conditioning compressor. Refer to «Air Conditioning Compressor Oil Diagnosis»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__air-conditioning-compressor-oil-diagnosis) .
5. Properly discard the used refrigerant oil.

Balancing Procedure

1. Before installing the air conditioning 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 air conditioning compressor. Refer to the amount of refrigerant oil recorded during the air conditioning compressor removal.

Scheme 1

Air Conditioning Compressor Replacement (LUJ, LUV)

Scheme 2

Air Conditioning Compressor Replacement (2H0)

Compressor Leak Testing (R-134a)

Special Tools

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

For equivalent regional tools. Refer to Special Tools .

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

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

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

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

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

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

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

Ensure that the vehicle has at least 0.45 kg (1 lb) of refrigerant in the A/C refrigeration system in order to perform a leak test. Refer to Refrigerant Recovery and Recharging (R-134a) for recharging the A/C system.

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

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

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

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

Scheme 3

Air Conditioning Clutch Assembly Replacement (LUJ, LUV)

Scheme 4

Air Conditioning Clutch Assembly Replacement (2H0)

Scheme 5

Compressor Pressure Relief Valve Replacement (LUJ, LUV)

Scheme 6

Compressor Pressure Relief Valve Replacement (2HO)

Scheme 7

Air Conditioning Compressor Bracket Replacement (LUJ, LUV)

Scheme 8

Air Conditioning Compressor Bracket Replacement (2H0)

Removal Procedure

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

Installation Procedure

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

1. Disassemble the A/C refrigerant components. Refer to the appropriate repair procedure.
2. 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 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 of 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 (1) must be fully seated.
7. Assemble the A/C components.

Scheme 9

Air Conditioning Compressor Hose Replacement (LUJ, LUV)

Scheme 10

Air Conditioning Compressor Hose Replacement (2H0)

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
2. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) .
3. Disconnect the electrical connector from the air conditioning refrigerant pressure sensor.
4. Remove the air conditioning compressor hose assembly (1) from the air conditioning condenser hose at the evaporator hose assembly and position out of the way. Refer to «Air Conditioning Compressor Hose Replacement (LUJ, LUV)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
5. Remove and discard the old sealing washer (2) and replace with a NEW sealing washer.
6. Remove the front bumper fascia assembly. Refer to «Front Bumper Fascia Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-body-panels/#bumpers-and-fascias) , «Front Bumper Fascia Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-body-panels/#bumpers-and-fascias) .
7. Remove air conditioning condenser hose assembly nut (1) from the air conditioning condenser.
8. Remove air conditioning condenser hose assembly (2) from air conditioning condenser.
9. Remove and discard the old sealing washers (3) and replace with NEW sealing washers.
10. Remove air conditioning condenser hose assembly bolt (1) from the air conditioning compressor assembly.
11. Remove air conditioning condenser hose assembly (2) from air conditioning compressor assembly.
12. Remove and discard the old sealing washers (3) and replace with a NEW sealing washers.
13. Remove air conditioning condenser hose assembly (1) from the vehicle.
14. Transfer all required parts

1. Install air conditioning condenser hose assembly into the vehicle.
2. Install the air conditioning refrigerant pressure sensor. Refer to «Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LUJ, LUV)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
3. Install NEW air conditioning sealing washer (3) to the air conditioning condenser hose assembly.
4. Install the air conditioning condenser hose assembly (2) to the air conditioning compressor assembly.
5. Install air conditioning condenser hose assembly bolt (1) and tighten the bolt to 22 N.m (16 lb ft).
6. Install NEW air conditioning sealing washers (3) to the air conditioning condenser hose assembly.
7. Install the air conditioning condenser hose assembly (2) to the air conditioning condenser.
8. Install the air conditioning condenser hose assembly nut (1) and tighten the nut to 22 N.m (16 lb ft).
9. Install the front fascia assembly. Refer to «Front Bumper Fascia Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-body-panels/#bumpers-and-fascias) , «Front Bumper Fascia Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-body-panels/#bumpers-and-fascias) .
10. Install NEW air conditioning sealing washer (2) to the air conditioning condenser hose assembly.
11. Install the air conditioning condenser hose assembly (1) to the evaporator hose assembly.
12. Install the air compressor hose assembly to the air conditioning condenser hose assembly (1). Refer to «Air Conditioning Compressor Hose Replacement (LUJ, LUV)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
13. Connect the A/C refrigerant pressure sensor electrical connector.
14. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) .
15. Charge the refrigerant system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .

1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
2. Remove the air cleaner inlet duct. Refer to Air Cleaner Inlet Duct Replacement (2H0).
3. Remove the air conditioning compressor hose assembly from the air conditioning condenser hose at the evaporator hose assembly and position out of the way. Refer to «Air Conditioning Compressor Hose Replacement (2H0)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
4. Remove the air conditioning condenser hose assembly (1) from the evaporator hose assembly.
5. Remove and discard the old sealing washers (2) and replace with NEW sealing washers.
6. Disconnect the electrical connector from the air conditioning refrigerant pressure sensor.
7. Remove air conditioning condenser hose assembly bolt (1) from the air conditioning compressor.
8. Remove air conditioning condenser hose assembly (2) from the air conditioning compressor.
9. Remove and discard the old sealing washers (3) and replace with NEW sealing washers.
10. Remove the front bumper fascia. Refer to «Front Bumper Fascia Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-body-panels/#bumpers-and-fascias) , «Front Bumper Fascia Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-body-panels/#bumpers-and-fascias) .
11. Remove air conditioning condenser hose assembly nut (1) from the air conditioning condenser.
12. Remove air conditioning condenser hose assembly (2) from air conditioning condenser.
13. Remove and discard the old sealing washers (3) and replace with NEW sealing washers.
14. Remove air conditioning condenser hose assembly (1) from the vehicle.
15. Transfer all required parts

1. Install the air conditioning refrigerant pressure sensor if removed. Refer to «Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (2H0)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. Install air conditioning condenser hose assembly into the vehicle.
3. Install NEW air conditioning sealing washer (3) to the air conditioning condenser hose assembly (2).
4. Install the air conditioning condenser hose assembly (2) to the air conditioning condenser assembly.
5. Install air conditioning condenser hose assembly nut (1) and tighten the nut to 22 N.m (16 lb ft).
6. Install the front bumper fascia. Refer to «Front Bumper Fascia Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-body-panels/#bumpers-and-fascias) , «Front Bumper Fascia Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-body-panels/#bumpers-and-fascias) .
7. Install NEW air conditioning sealing washers (3) to the air conditioning condenser hose assembly.
8. Install the air conditioning condenser hose assembly (2) to the air conditioning compressor assembly.
9. Install the air conditioning condenser hose assembly bolt (1) and tighten the bolt to 22 N.m (16 lb ft).
10. Connect the electrical connector to the air conditioning refrigerant pressure sensor.
11. Install NEW air conditioning sealing washer (2) to the air conditioning condenser hose assembly (1).
12. Install the air conditioning condenser hose assembly (1) to the evaporator hose assembly.
13. Install the air compressor hose assembly to the air conditioning condenser hose assembly. Refer to «Air Conditioning Compressor Hose Replacement (2H0)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
14. Install the air cleaner inlet duct. Refer to Air Cleaner Inlet Duct Replacement (2H0).
15. Charge the refrigerant system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .

Scheme 11

Air Conditioning Evaporator Hose Assembly Replacement (LUJ, LUV)

Scheme 12

Air Conditioning Evaporator Hose Assembly Replacement (2H0)

Air Conditioning Refrigerant Service Valve Core Replacement

Special Tools

1. GE 50078 Electronic Leak Detector
2. GE 46246 Valve Core Tool

For equivalent regional tools. Refer to Special Tools .

1. Recover the refrigerant from the A/C system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
2. Using the GE 46246 Valve Core Tool , remove the valve core (1) from the service port.

1. Install the valve core (1) to the service port.
2. Using the GE 46246 Valve Core Tool , tighten the valve core.
3. Evacuate and recharge the A/C system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
4. Leak test the fittings of the component using GE 50078 Electronic Leak Detector.

Scheme 13

Air Conditioning Refrigerant Desiccant Replacement (LUJ, LUV)

Scheme 14

Air Conditioning Refrigerant Desiccant Replacement (2H0)

Scheme 15

Air Conditioning Evaporator Thermal Expansion Valve Replacement (LUJ, LUV)

Scheme 16

Air Conditioning Evaporator Thermal Expansion Valve Replacement (2H0)

Scheme 17

Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LUJ, LUV)

Scheme 18

Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (2H0)

Scheme 19

Air Conditioning Evaporator Temperature Sensor Replacement (5 Sensor RPO CJ2 LHD)

Scheme 20

Air Conditioning Evaporator Temperature Sensor Replacement (With RPO C67 LHD)

Scheme 21

Air Conditioning Condenser Replacement (LUV)

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/buick/encore/i-2012-2016/remont/body-electrical/#battery-charging-system-and-starting-system) .
2. Recover the refrigerant system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
3. Drain the engine coolant system. Refer to «Cooling System Draining and Filling»(/buick/encore/i-2012-2016/remont/cooling-system-mechanical/#engine-cooling-system) .
4. Remove the heater inlet hose from the heater core tube. Refer to «Heater Inlet Hose Replacement (LUJ, LUV)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Inlet Hose Replacement (2H0)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
5. Remove the heater outlet hose from the heater core tube. Refer to «Heater Outlet Hose Replacement (2H0)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (LUJ, LUV)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (LUJ, LUV Rear)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
6. Remove the evaporator hose assembly from the thermal expansion valve. Refer to «Air Conditioning Evaporator Hose Assembly Replacement (LUJ, LUV)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Air Conditioning Evaporator Hose Assembly Replacement (2H0)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
7. Remove the right side floor rear air outlet duct. Refer to «Floor Front Air Outlet Duct Replacement - Right Side»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
8. Remove the left side floor rear air outlet duct. Refer to «Floor Front Air Outlet Duct Replacement - Left Side (Encore)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Floor Front Air Outlet Duct Replacement - Left Side (Trax)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__floor-front-air-outlet-duct-replacement) .
9. Remove the instrument panel tie bar assembly. Refer to «Instrument Panel Tie Bar Replacement»(/buick/encore/i-2012-2016/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
10. Remove the Heating Ventilation and Air Conditioning (HVAC) module assembly drain tube (1) from the HVAC module assembly.
11. From within the engine compartment, remove the HVAC module assembly nut, (1) securing the HVAC module assembly to the cowl panel.
12. Remove the HVAC module assembly (1) from the vehicle.
13. Transfer all necessary components.

1. Position the HVAC module assembly (1) into the vehicle and temporarily support it.
2. From within the engine compartment, install the HVAC module assembly nut (1) securing the HVAC module assembly to the cowl panel, and tighten to 22 (16 lb ft)
3. Install the HVAC module assembly drain tube (1) to the HVAC module assembly.
4. Install the instrument panel tie bar assembly. Refer to «Instrument Panel Tie Bar Replacement»(/buick/encore/i-2012-2016/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
5. Install the left side floor rear air outlet duct. Refer to «Floor Front Air Outlet Duct Replacement - Left Side (Encore)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Floor Front Air Outlet Duct Replacement - Left Side (Trax)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__floor-front-air-outlet-duct-replacement) .
6. Install the right side floor rear air outlet duct. Refer to «Floor Front Air Outlet Duct Replacement - Right Side»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
7. Install the evaporator hose assembly to the thermal expansion valve. Refer to «Air Conditioning Evaporator Hose Assembly Replacement (LUJ, LUV)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Air Conditioning Evaporator Hose Assembly Replacement (2H0)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
8. Install the heater outlet hose to the heater core tube. Refer to «Heater Outlet Hose Replacement (2H0)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (LUJ, LUV)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Outlet Hose Replacement (LUJ, LUV Rear)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
9. Install the heater inlet hose to the heater core tube. Refer to «Heater Inlet Hose Replacement (LUJ, LUV)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) , «Heater Inlet Hose Replacement (2H0)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
10. Fill the engine coolant system. Refer to «Cooling System Draining and Filling»(/buick/encore/i-2012-2016/remont/cooling-system-mechanical/#engine-cooling-system) .
11. Recharge the refrigerant system. Refer to «Refrigerant Recovery and Recharging (R-134a)»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning__refrigerant-recovery-and-recharging-r-134a) .
12. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection»(/buick/encore/i-2012-2016/remont/body-electrical/#battery-charging-system-and-starting-system) .

Scheme 22

Heater and Air Conditioning Evaporator and Blower Upper Case Replacement

Scheme 23

Heater and Air Conditioning Evaporator and Blower Lower Case Replacement

Scheme 24

Air Conditioning (A/C) Evaporator Case Assembly Replacement

Scheme 25

Air Conditioning Evaporator Replacement

Scheme 26

Air Conditioning Evaporator Module Drain Hose Replacement

Scheme 27

Heater Inlet Hose Replacement (LUJ, LUV)

Scheme 28

Heater Inlet Hose Replacement (2H0)

Scheme 29

Heater Outlet Hose Replacement (2H0)

Scheme 30

Heater Outlet Hose Replacement (LUJ, LUV)

1. Drain the cooling system. Refer to «Cooling System Draining and Filling»(/buick/encore/i-2012-2016/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) .
3. Using BO-38185 Hose Clamp Pliers , reposition the heater outlet rear hose clamp (1) on the heater outlet rear hose (2).
4. Remove the heater outlet rear hose (2) from the heater outlet rear hose tee.
5. Remove the heater outlet rear hose retainer (3) from the engine.
6. Using BO-38185 Hose Clamp Pliers , reposition the heater outlet rear hose clamp (1) on the heater outlet rear hose (2).
7. Remove the heater outlet rear hose (2) from the heater outlet hose connector (3).
8. Remove the heater outlet hose assembly (2) from the vehicle.

1. Install the heater outlet rear hose (2) into the heater outlet hose connector (3).
2. Using BO-38185 Hose Clamp Pliers , reposition the heater outlet rear hose clamp (1) on the heater outlet rear hose (2).
3. Install the heater outlet rear hose retainer (3) to the engine.
4. Install the heater outlet rear hose (2) to the heater outlet rear hose tee.
5. Using BO-38185 Hose Clamp Pliers , reposition the heater outlet rear hose clamp (1), on the heater outlet rear hose (2).
6. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) .
7. Fill the cooling system. Refer to «Cooling System Draining and Filling»(/buick/encore/i-2012-2016/remont/cooling-system-mechanical/#engine-cooling-system) .
8. Check the cooling system for leaks.

Scheme 31

Heater Core Outlet Tube Replacement

Scheme 32

Heater Core Inlet Tube Replacement

Scheme 33

Heater Inlet Hose Connector Replacement

Scheme 34

Heater Outlet Hose Connector Replacement

Scheme 35

Passenger Compartment Air Filter Replacement

Scheme 36

Air Inlet Assembly Replacement

Scheme 37

Blower Motor Control Module Replacement

Scheme 38

Air Inlet Valve Actuator Replacement (CJ2 C67)

Scheme 39

Air Inlet Valve Actuator Replacement (C60)

Removal Procedure - Production Blower Motor

1. Remove the right side front floor air outlet duct. Refer to «Floor Front Air Outlet Duct Replacement - Right Side»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. Remove the 3 blower motor cover screws, and remove the blower motor cover.
3. Disconnect the blower motor wire harness connector.
4. Cut out the blower motor using a utility knife, following the narrow groove around the blower motor assembly in the lower case.
5. Remove the blower motor assembly.

Removal Procedure - Service Blower Motor

1. Remove the right side front floor air outlet duct. Refer to «Floor Front Air Outlet Duct Replacement - Right Side»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
2. Remove the blower motor cover (if required).
3. Disconnect the blower motor wire harness connector.
4. Remove the 3 outer most screws from blower service ring or blower integrated ring.
5. Remove the blower motor assembly.

1. Clean and smooth the rough edges, and remove any burs of plastic from heater and air conditioning evaporator and blower lower module case, where the original blower motor assembly was cut out of the heater and air conditioning evaporator and blower lower module case.
2. Attach the blower service ring to the blower motor assembly using service screws.
3. When using the original blower motor assembly that has been cut out of the lower case, install the blower motor assembly with the service ring assembly to the heater and air conditioning evaporator and blower module lower case, with the additional service screws, and tighten the screws.
4. When using the service blower motor kit, install the service blower motor assembly to the heater and air conditioning evaporator and blower lower module case, with additional service screws, and tighten the screws.
5. Install the blower motor cover.
6. Connect the blower motor wire harness connector.
7. Install the right side front floor air outlet duct. Refer to «Floor Front Air Outlet Duct Replacement - Right Side»(/buick/encore/i-2012-2016/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

Scheme 40

Air Distributor Case Replacement

Scheme 41

Instrument Panel Outer Air Outlet Replacement (Trax)

Scheme 42

Instrument Panel Outer Air Outlet Replacement (Encore)

Scheme 43

Instrument Panel Center Air Outlet Replacement (Trax)

Scheme 44

Instrument Panel Center Air Outlet Replacement (Encore)

Scheme 45

Floor Front Air Outlet Duct Replacement - Right Side

Scheme 46

Floor Front Air Outlet Duct Replacement - Left Side (Encore)

Floor Front Air Outlet Duct Replacement - Left Side (Trax)

Floor Front Air Outlet Duct Replacement - Left Side (Trax)

Scheme 47

Instrument Panel Outer Air Outlet Duct Replacement (Trax)

Scheme 48

Windshield Defroster Outlet Duct Replacement

Scheme 49

Floor Rear Air Outlet Duct Replacement - Left Side

Scheme 50

Floor Rear Air Outlet Duct Replacement - Right Side

Scheme 51

Temperature Valve Gear Replacement (C60)

Scheme 52

Heater Core Replacement

Scheme 53

Heater Case Replacement

Engine Coolant

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

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

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

A/C Cycle

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

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

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

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

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

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

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

Special Tools

Illustration Tool Number / Description BO 38185 J 38185 Hose Clamp Pliers GE 8800 J 43600 ACR 2000 Air Conditioning Service Center GE 39400-A J 39400-A Halogen Leak Detector GE 41447 J 41447 R-134a A/C Tracer Dye - Box of 24 GE 42220 J 42220 Universal 12V Leak Detection Lamp GE 43872 J 43872 Fluorescent Dye Cleaner GE 45037 J 45037 A/C Oil Injector GE 45268 J 45268 A/C Flushing Adapter Kit GE 46246 J 46246 Valve Core Tool GE 46297 J 46297 A/C Dye Injector Kit GE 46297-12 J 46297-12 Replacement Dye Cartridges GE 48800 CoolTech A/C Recharge Machine J 37872 GE 48965 CH 50198 Clutch Plate Holder GE 50078 Electronic Leak Detector 7000086I Scan Tool Used for diagnosis of vehicle electrical system

Scheme 54

Scheme 55

Scheme 56

Scheme 57

Scheme 58

Scheme 59

Scheme 60

Scheme 61

Scheme 62

Scheme 63

Scheme 64

Scheme 65

See also:
• Symptoms - HVAC Systems - Automatic
• Symptoms - HVAC Systems - Manual
• Engine Fails To Reach Normal Operating Temperature
• DTC P0645, P0646, or P0647
• Diagnostic Starting Point - Vehicle
• Vibration Analysis - Engine
• Instrument Panel Tie Bar Replacement
• Loss of Coolant
• Lifting and Jacking the Vehicle
• Front Bumper Fascia Opening Lower Cover Replacement (Trax)
• Fastener Caution
• Front Compartment Front Center Insulator Replacement
• Air Cleaner Assembly Replacement
• Radio Replacement (Encore)
• Radiator Air Lower Baffle and Deflector Replacement (LUJ, LUV)
• Battery Negative Cable Disconnection and Connection
• Special Tools
• Cooling System Leak Testing
• Actuator Recalibration
• HVAC Duct Heat Stake Caution
• Floor Panel Carpet Replacement (Encore)
• Adhesives, Fluids, Lubricants, and Sealers
• Special Tools
• Refrigerant Recovery and Recharging (R-134a)
• Leak Testing
• A/C Diagnostics Chart
• Heating and Air Conditioning System Description and Operation
• Heating Performance Diagnostic
• Refrigerant System Specifications
• Air Conditioning Compressor Oil Diagnosis
• Floor Front Air Outlet Duct Replacement - Left Side (Trax)