Flushing
Flushing
Special Tools
* 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 45268 A/C Flush Adapter Kit
Note: Flushing is not intended to remove metal from the A/C system.
Flushing is intended to remove the following:
* Contaminated polyalkylene glycol (PAG) oil
* Desiccant, following a desiccant bag failure
* Overcharge of PAG oil
* Refrigerant contamination
Forward Flushing Setup
Note:
* Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.
* Inspect and lubricate the J 45268 fitting O-rings. Refer to O-Ring Replacement (Service and Repair).
1. Install the J 45268-7 (2) onto the suction line adapter block J 45268-13 (1).
2. Install the J 45268-8 (3) onto the discharge line adapter block J 45268-12 (4).
Reverse Flushing Setup
Note:
* Reverse flow refrigerant flush is recommended for desiccant bag failure. Replace the condenser/receiver dehydrator assembly when the A/C flush is complete and perform the following procedure:
* Inspect and lubricate the J 45268 fitting O-rings. Refer to O-Ring Replacement (Service and Repair).
1. Install the J 45268-8 (2) onto the suction line adapter block J 45268-13 (1).
2. Install the J 45268-7 (3) onto the discharge line adapter block J 45268-12 (4).
Flush Procedure
Note: Warmer engine or ambient temperatures decreases the refrigerant recovery time during the A/C flush procedure.
1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging (Refrigerant Recovery and Recharging).
2. Remove the thermal expansion valve (TXV). Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement (Service and Repair).
3. Install new O-rings onto the evaporator core and A/C lines. Refer to O-Ring Replacement (Service and Repair).
4. Install the A/C lines into J 45268-110.
5. Install J 45268-110 onto the evaporator core.
6. Install the TXV line bracket.
Caution: Refer to Fastener Caution (Fastener Caution).
7. Install TXV mounting bolts and tighten to 3.5 Nm (31 lb in).
8. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement (LY7, LLT) (Service and Repair)Air Conditioning Compressor Replacement (LSA) (Service and Repair).
Note: The filter inside J 45268-1 is serviceable. Remove and discard the check valve from the filter.
9. Service the filter with AC Delco P/N GF 470, before each flush.
Note: Install new O-rings onto the A/C discharge and suction lines. Refer to O-Ring Replacement (Service and Repair).
10. Install the J 45268-13 to the A/C suction line.
11. Install the J 45268-12 to the A/C discharge line.
12. Connect the J 45268-1 flush filter to the J 45268-7 flush fitting.
13. Connect the blue hose from the J 43600 to J 45268-1 flush filter adapter.
14. Connect the red hose from the J 43600 to J 45268-8 flush fitting.
Note: Close the valve on the external refrigerant tank, before starting the flush process.
15. Flush the A/C system. Follow the instructions supplied with the J 43600 .
16. Disconnect the red hose from the J 43600 to J 45268-8 flush fitting.
17. Disconnect the blue hose from the J 43600 to J 45268-1 flush filter adapter.
18. Disconnect the J 45268-1 flush filter from the J 45268-7 flush fitting.
19. Remove the J 45268-12 from the A/C discharge line.
20. Remove the J 45268-13 from the A/C suction line.
Note: Flushing will remove all the PAG oil from the A/C system.
The A/C system must be replenished with the correct amount of PAG oil.
21. If you will reinstall the removed A/C compressor, perform the following procedure:
1. Remove the drain oil bolt from the removed compressor.
2. Drain and properly discard the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
3. Add the total system capacity of PAG oil into the A/C compressor oil drain. Refer to Refrigerant System Capacities ([1][2]Capacity Specifications).
Note: Flushing will remove the fluorescent leak detection dye from the A/C system.
4. Add one bottle of J 41447 directly to the A/C compressor.
Note: A new service compressor is shipped with a full charge of PAG oil. Refer to Refrigerant System Capacities ([1][2]Capacity Specifications).
22. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement (LY7, LLT) (Service and Repair)Air Conditioning Compressor Replacement (LSA) (Service and Repair).
23. Remove the TXV mounting bolts.
24. Remove the TXV line bracket.
25. Remove J 45268-110 from the evaporator core.
26. Remove the A/C lines from J 45268-110.
27. Inspect the TXV for debris. Clean or replace as needed.
28. Replace the desiccant bag. Refer to Air Conditioning Refrigerant Desiccant Replacement (Service and Repair).
29. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging (Refrigerant Recovery and Recharging).
30. Leak test the fittings using J 42220 .