Refrigerant: Service and Repair

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 For the proper quantities of oil to add to the A/C refrigerant system, refer to Refrigerant System Capacities.

Flushing
TOOLS REQUIRED
- J 43600 Air Conditioning Service Center
- J 45268 Flush Adapter Kit
- J 41447 Leak Detection Dye
- J 41459 Leak Detection Dye Injector
- J 42220 Universal Leak Detection Lamp

IMPORTANT: Flushing is not intended to remove metal from the A/C system.

Flushing is intended to remove the following:
- Contaminated PAG oil
- Desiccant, following a desiccant bag failure
- Overcharge of PAG oil
- Refrigerant contamination

IMPORTANT: Warmer engine or ambient temperature decreases the refrigerant recovery time during the A/C flush procedure.

1. Recover the refrigerant.
2. Remove the orifice tube.
3. Connect the A/C lines with the orifice tube removed.
4. Remove the A/C compressor.
5. Install the J 45268-3 to the A/C compressor hose assembly.
6. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil. Perform the following procedure:

IMPORTANT: The filter inside the J 45268-1 is serviceable. Remove and discard the check valve from the filter.

6.1. Service the filter with AC Delco P/N GF 470, before each flush.
Connect the J 45268-1 flush filter to the suction port of the J 45268-3 flush adapter.
6.2. Connect the blue hose from the J 43600 to the J 45268-1 flush filter adapter.
6.3. Connect the red hose from the J 43600 to the J 45268-3.
7. Reverse the refrigerant flushing is recommended for desiccant bag failure only.
Perform the following procedure and replace the accumulator when the flush is complete:

IMPORTANT: The filter inside the J 45268-1 is serviceable. Remove and discard the check valve from the filter.

7.1. Service the filter with ACDelco P/N GF 470, before each flush.
Connect the J 45268-1 flush filter to the discharge port of the J 45268-3 flush adapter.
7.2. Connect the blue hose from the J 43600 to the J 45268-1 flush filter adapter.
7.3. Connect the red hose from the J 43600 to the suction port of the J 45268-3.
8. Flush the A/C system. Follow the instructions supplied with the J 43600.
Close the valve on the external refrigerant tank, before starting the flush process.
9. Remove the J 45268-3 from the A/C compressor hose assembly.
- Remove the A/C compressor drain plug.
- Drain the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
- Install the A/C compressor drain plug.

Tighten
Tighten the drain plug to 20 N.m (15 lb ft).

10. Install the A/C compressor.
11. Inspect the orifice tube for debris. Clean or replace as needed.
12. Install the orifice tube.
13. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.

IMPORTANT: Flushing will remove all the PAG oil from the A/C system.

14. Add the total system capacity of PAG oil to the A/C system. Refer to Refrigerant System Capacities.

IMPORTANT: Flushing will remove the fluorescent leak detection dye from the A/C system.

15. Add one bottle of J41447 using the J41459.
16. Leak test the fittings using the J42220.