Heating, Ventilation and Air Conditioning: Maintenance GMC Acadia I

Flushing Procedure

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»(ref-365250-S31567954842010070600000) .
2. Remove the front thermal expansion valve (TXV). Refer to «Air Conditioning Evaporator Thermal Expansion Valve Replacement»(ref-365250-S01510746112010070600000) .
3. Install the J 45268-121 in place of the TXV.
4. Remove the A/C compressor. Refer to «Air Conditioning Compressor Replacement»(ref-365250-S28333470572010070600000) .
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 to J 45268-1 flush filter adapter. See «Special Tools»(ref-365250-S10056360502010070600000) . Connect the red hose from J 43600 to J 45268-5 flush adapter. See «Special Tools»(ref-365250-S10056360502010070600000) .
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 to J 45268-1 flush filter adapter. See «Special Tools»(ref-365250-S10056360502010070600000) . Connect the red hose from J 43600 to the suction port of J 45268-4 flush adapter. See «Special Tools»(ref-365250-S10056360502010070600000) .
9. Flush the front A/C system. Follow the instructions supplied with the J 43600 . See «Special Tools»(ref-365250-S10056360502010070600000) .
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»(ref-365250-S01510746112010070600000) . Install J 45268-121 in place of the auxiliary TXV.
11. Flush the auxiliary A/C system. Follow the instructions supplied with J 43600 . See «Special Tools»(ref-365250-S10056360502010070600000) .
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 Capacities»(ref-365250-S02447026852010070600000) .
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 Capacities»(ref-365250-S02447026852010070600000) . 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 Capacities»(ref-365250-S02447026852010070600000) . Add the calculated amount to the compressor, as needed.
16. Add one bottle of J 41447 directly to the A/C compressor. See «Special Tools»(ref-365250-S10056360502010070600000) .
17. Install the A/C compressor. Refer to «Air Conditioning Compressor Replacement»(ref-365250-S28333470572010070600000) .
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»(ref-365250-S24239182002010070600000) .
21. Evacuate and recharge the A/C system. Refer to «Refrigerant Recovery and Recharging»(ref-365250-S31567954842010070600000) .
22. Leak test the fittings using J 42220 . See «Special Tools»(ref-365250-S10056360502010070600000) .

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»(ref-365250-S38971814302010070600000) .
4. Properly discard the used refrigerant oil.