Heating, Ventilation and Air Conditioning: Other GMC Envoy II

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 . See «Special Tools»(ref-200405-S14942364402005102000000) .
4. To prevent false diagnosis in the future, thoroughly clean the residual dye from any area where leaks were found. Use a rag and the approved J 43872 . See «Special Tools»(ref-200405-S14942364402005102000000) .

Fluorescent Dye Injection

1. Not all of the fluorescent dyes are compatible with PAG oil. Some types of dye decrease the oil viscosity or may chemically react with the oil.
2. R-134A leak detection dye requires time to work. Depending upon the leak rate, a leak may not become visible for between 15 minutes and 7 days.
3. To prevent false diagnosis, thoroughly clean any residual dye from the service port with a rag and the approved fluorescent dye cleaner J 43872 . See «Special Tools»(ref-200405-S14942364402005102000000) .

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.

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

Follow the instructions supplied with the J 39400-A .

Defrosting Insufficient

Defrosting Insufficient

Eliminating Air Conditioning Odor

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

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

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

Deodorize the evaporator core using Deodorizing Aerosol Kit.

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

1. Ensure that the plenum which 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 warmest 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

Tools Required

1. J 43600 ACR 2000 Air Conditioning Service Center. See «Special Tools»(ref-200405-S14942364402005102000000) .
2. J 45037 A/C Oil Injector. See «Special Tools»(ref-200405-S14942364402005102000000) .

Note. R-134a is the only approved refrigerant for use in this vehicle. The use of any other refrigerant may result in poor system performance or component failure.

Note. To avoid system damage use only R-134a dedicated tools when servicing the A/C system.

Note. Use only Polyalkylene Glycol Synthetic Refrigerant Oil (PAG) for internal circulation through the R-134a A/C system and only 525 viscosity mineral oil on fitting threads and O-rings. If lubricants other than those specified are used, compressor failure and/or fitting seizure may result.

Note. R-12 refrigerant and R-134a refrigerant must never be mixed, even in the smallest of amounts, as they are incompatible with each other. If the refrigerants are mixed, compressor failure is likely to occur. Refer to the manufacturer instructions included with the service equipment before servicing.

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

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

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

Refer to the J 43600 ACR 2000 manual for operation and setup instruction. See Special Tools . Always recharge the A/C System with the proper amount of R-134a. Refer to Refrigerant System Capacities for the correct amount.

A/C Refrigerant System Oil Charge Replenishing

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

Balancing Procedure

1. The replacement compressor is shipped with 240 ml (8.0 oz) of refrigerant oil.
2. Before installing the compressor, the refrigerant oil will have to be partially drained: Refer to the amount of refrigerant oil recorded during the compressor removal. Subtract the amount recorded from the total system capacity. Refer to «Refrigerant System Capacities»(ref-200405-S33665552472005102000000) . The difference between the total system capacity and the recorded amount is the calculated amount to be drained from the replacement compressor.
3. Drain the calculated amount of refrigerant oil from the replacement compressor.

Tools Required

J 39400-A Halogen Leak Detector

J 39400-A Halogen Leak Detector

J 39400-A Halogen Leak Detector

J 39400-A Halogen Leak Detector

J 39400-A Halogen Leak Detector

J 39400-A Halogen Leak Detector

J 39400-A Halogen Leak Detector

J 39400-A Halogen Leak Detector

J 39400-A Halogen Leak Detector

J 39400-A Halogen Leak Detector

J 41425 A/C Line Repair Kit. See Special Tools .

Do not service the rear A/C or heater lines as a complete unit. Service the rear A/C or heater lines as a sectional repair.

You can obtain the various sections of line through GMSPO.

Use the J 41425 when any of the following actions damage the rear A/C or heater lines:. See Special Tools .

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.

Heater and Air Conditioning (A/C) Pipe Replacement/Repair - Auxiliary

Straight Line Repair

1. Recover the refrigerant, if repairing the A/C lines. Refer to «Refrigerant Recovery and Recharging»(ref-200405-S26753095092005102000000) .
2. Drain the coolant, if repairing the heater lines. Refer to «Draining and Filling Cooling System (LL8)»(ref-200409-S40000666192005102000000) or «Draining and Filling Cooling System (LM4)»(ref-200409-S00791831952005102000000) in Engine Cooling.
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-200385-S41061932852005102000000) in General Information.
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 in order to clean any burrs or grease from the line ends. See «Special Tools»(ref-200405-S14942364402005102000000) . Be sure to clean at least 19 mm (0.75 in) from the line splice area.
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 Step 8 through Step 16 to complete the line splice.
18. Verify that the LOK fittings are correctly installed.
19. Lower the vehicle.
20. Refill the coolant, if drained. Refer to «Draining and Filling Cooling System (LL8)»(ref-200409-S40000666192005102000000) or «Draining and Filling Cooling System (LM4)»(ref-200409-S00791831952005102000000) in Engine Cooling.
21. Evacuate and recharge the refrigerant, if repairing the A/C lines. Refer to «Refrigerant Recovery and Recharging»(ref-200405-S26753095092005102000000) .

Line Sectioning Repair

1. Recover the refrigerant, if repairing the A/C lines. Refer to «Refrigerant Recovery and Recharging»(ref-200405-S26753095092005102000000) .
2. Drain the coolant, if repairing the heater lines. Refer to «Draining and Filling Cooling System (LL8)»(ref-200409-S40000666192005102000000) or «Draining and Filling Cooling System (LM4)»(ref-200409-S00791831952005102000000) in Engine Cooling.
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-200385-S41061932852005102000000) in General Information.
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 in order to clean any burrs or grease. See «Special Tools»(ref-200405-S14942364402005102000000) . Be sure to clean at least 19 mm (0.75 in) from the line splice area.
11. Use the LOK prep sealant in order to prep the line ends.
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" 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 «Draining and Filling Cooling System (LL8)»(ref-200409-S40000666192005102000000) or «Draining and Filling Cooling System (LM4)»(ref-200409-S00791831952005102000000) in Engine Cooling.
22. Evacuate and recharge the refrigerant, if repairing the A/C lines. Refer to «Refrigerant Recovery and Recharging»(ref-200405-S26753095092005102000000) .