Hummer H2. Manual - part 1971

Fig. 3: Draining A/C Compressor Oil 
Courtesy of GENERAL MOTORS CORP. 

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. Properly discard the used refrigerant oil. 

 

2004 Hummer H2 

2004 HVAC Heating, Ventilation and Air Conditioning - Hummer H2

  

Balancing 

1. The replacement compressor is shipped with the total system capacity of refrigerant oil. 

Fig. 4: Draining A/C Compressor Oil

IMPORTANT: The refrigerant oil in the A/C system must be balanced during compressor 

replacement.

 

2004 Hummer H2 

2004 HVAC Heating, Ventilation and Air Conditioning - Hummer H2

  

Courtesy of GENERAL MOTORS CORP.

2. Before installing the compressor, the refrigerant oil will have to be partially drained: 

1. Refer to the amount of refrigerant oil recorded during the compressor removal.  

2. Subtract the amount recorded from the total system capacity. Refer to Refrigerant System 

Capacities . 

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.  

COMPRESSOR REPLACEMENT 

Tools Required 

J 39400-A Halogen Leak Detector. See Special Tools and Equipment . 

Removal Procedure 

Fig. 5: A/C Belt Tensioner 

 

2004 Hummer H2 

2004 HVAC Heating, Ventilation and Air Conditioning - Hummer H2

  

Courtesy of GENERAL MOTORS CORP.

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

2. Remove the fan shroud. Refer to Fan Shroud Replacement in Engine Cooling.  

3. Install a ratchet into the air conditioning (A/C) belt tensioner adapter opening.  

4. Rotate the A/C belt tensioner clockwise in order to relieve the tension on the belt.  

5. Remove the A/C belt from the A/C compressor.  

6. Slowly release the tension on the A/C belt tensioner.  

7. Remove the A/C discharge hose bolt from the A/C compressor.  

8. Remove the A/C discharge hose from the A/C compressor.  

9. Remove the A/C suction hose bolt from the A/C compressor.  

10. Remove the A/C suction hose from the A/C compressor.  

11. Discard the sealing washers.  

12. Cap or tape all of the hose and line ends.  

13. Disconnect the electrical connector from the A/C compressor coil. 

 

2004 Hummer H2 

2004 HVAC Heating, Ventilation and Air Conditioning - Hummer H2