Hummer H2. Manual - part 1975

Fig. 16: Identifying Sealing Washer 
Courtesy of GENERAL MOTORS CORP. 

3. Using a lint-free clean, dry cloth, clean the sealing surfaces of the A/C refrigerant components.  

4. Carefully install the new seal washer onto the A/C refrigerant component. 

The washer must completely bottom against the surface of the fitting. 

IMPORTANT: After tightening the A/C components, there should be a slight sealing 

washer gap of approximately 1.2 mm (3/64 in) between the A/C line and 
the A/C component.

 

2004 Hummer H2 

2004 HVAC Heating, Ventilation and Air Conditioning - Hummer H2

  

5. Assemble the remaining A/C refrigerant components. Refer to the appropriate repair procedure.  

O-RING REPLACEMENT 

Removal Procedure 

Fig. 17: Identifying A/C Line Fittings 
Courtesy of GENERAL MOTORS CORP. 

1. Disassemble the A/C refrigerant components. Refer to the appropriate repair procedure 

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For compression style fittings use a back up wrench on the fitting (2) and loosen the fitting nut (1). 

 

2004 Hummer H2 

2004 HVAC Heating, Ventilation and Air Conditioning - Hummer H2

  

z

For banjo style fittings remove the bolt retaining the banjo type fitting.  

2. Remove the O-ring seal from the A/C refrigerant component.  

3. Inspect the O-ring seal for signs of damage to help determine the root cause of the failure.  

4. Inspect the A/C refrigerant components for damage or burrs. Repair if necessary. 

5. Cap or tape the A/C refrigerant components.  

6. Discard the O-ring seal.  

Installation Procedure 

1. Inspect the new O-ring seal for any sign or cracks, cuts, or damage. Replace if necessary.  

2. Remove the cap or tape from the A/C refrigerant components.  

3. Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the A/C refrigerant components. 

4. Lightly coat the new O-ring seal with mineral base 525 viscosity refrigerant oil. 

5. Carefully slide the new O-ring seal onto the A/C refrigerant component. 

IMPORTANT: Cap or tape the open A/C refrigerant components immediately to prevent 

system contamination.

IMPORTANT: DO NOT allow any of the mineral base 525 viscosity refrigerant oil on the 

new O-ring seal to enter the refrigerant system.

IMPORTANT: DO NOT reuse O-ring seals.

 

2004 Hummer H2 

2004 HVAC Heating, Ventilation and Air Conditioning - Hummer H2

  

Fig. 18: Seating O-Ring 
Courtesy of GENERAL MOTORS CORP. 

6. The O-ring seal must be fully seated. 

 

2004 Hummer H2 

2004 HVAC Heating, Ventilation and Air Conditioning - Hummer H2