Hummer H3. Manual — part 1262

J 45268 Flush Adapter Kit. See Special Tools.

J 41447 Leak Detection Dye. See Special Tools.

J 42220 Universal 12V Leak Detection Lamp. See Special Tools.

Flushing is intended to remove the following contaminants:

Contaminated polyalkyline glycol (PAG) oil

Desiccant, following a desiccant bag failure

Overcharge of PAG oil

Refrigerant contamination

Flushing Procedure

1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging.

2. Remove the thermal expansion valve (TXV). Refer to Thermal Expansion Valve

Replacement (Left Hand Drive) or Thermal Expansion Valve Replacement (Right
Hand Drive).

3. Install J 45268 - 103. See Special Tools.

4. Remove the A/C compressor. Refer to Compressor Replacement.

5. Install J 45268 - 5 to the discharge hose. See Special Tools.

6. Install J 45268 - 4 to the suction hose. See Special Tools.

IMPORTANT: Flushing with the ACR 2000 is not intended to remove metal from

the A/C system.

IMPORTANT: Warmer engine or ambient temperature decreases the

refrigerant recovery time during the A/C flush procedure.

2007 Hummer H3

2007 HVAC Heating, Ventilation and Air Conditioning - H3

Fig. 2: View Of A/C Filter And Check Valve
Courtesy of GENERAL MOTORS CORP.

7. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.

Perform the following procedure:

1. Service the filter with ACDelco P/N GF 470, before each flush.

Connect J 45268 - 1 flush filter to the suction port of J 45268 - 4 flush adapter. See
Special Tools.

2. Connect the blue hose from J 43600 to J 45268 - 1 flush filter adapter. See Special

Tools.

3. Connect the red hose from J 43600 to J 45268 - 5 flush adapter. See Special Tools.

8. Reverse flow refrigerant flush is recommended for desiccant bag failure. Replace the

receiver dehydrator when the A/C flush is complete and perform the following procedure:

1. Service the filter with ACDelco P/N GF 470, before each flush. Connect J 45268 - 1

IMPORTANT: The filter inside J 45268 - 1 is serviceable. See Special

Tools. Remove and discard the check valve from the
filter.

IMPORTANT: The filter inside J 45268 - 1 is serviceable. See Special

Tools. Remove and discard the check valve from the
filter.

2007 Hummer H3

2007 HVAC Heating, Ventilation and Air Conditioning - H3

flush filter to the discharge port of J 45268 - 5 flush adapter. See Special Tools.

2. Connect the blue hose from J 43600 to J 45268 - 1 flush filter adapter. See Special

Tools.

3. Connect the red hose from J 43600 to the suction port of J 45268 - 4 flush adapter.

See Special Tools.

9. Flush the A/C system. Follow the instructions supplied with J 43600 . See Special Tools.

Close the valve on the external refrigerant tank, before starting the flush process.

10. Remove J 45268 - 4 from the suction hose. See Special Tools.

11. Remove J 45268 - 5 from the discharge hose. See Special Tools.

12. Remove J 45268 - 1 from J 43600 . See Special Tools.

13. Drain the PAG oil from the A/C compressor.

Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.

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

System Capacities.

15. Add one bottle of J 41447 directly to the A/C compressor. See Special Tools.

16. Install the A/C compressor. Refer to Compressor Replacement.

17. Remove J 45268 - 103. See Special Tools.

18. Install new seal washers. Refer to Sealing Washer Replacement.

19. Inspect the TXV for debris. Clean or replace as needed.

20. Install the TXV. Refer to Thermal Expansion Valve Replacement (Left Hand Drive) or

Thermal Expansion Valve Replacement (Right Hand Drive).

21. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.

22. Leak test the fittings using J 42220 . See Special Tools.

COMPRESSOR OIL BALANCING

IMPORTANT: 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.

IMPORTANT: Flushing will remove the fluorescent leak detection dye from

the A/C system.

2007 Hummer H3

2007 HVAC Heating, Ventilation and Air Conditioning - H3

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.

IMPORTANT: Drain and measure as much of the refrigerant oil as possible

from the removed compressor.

2007 Hummer H3

2007 HVAC Heating, Ventilation and Air Conditioning - H3