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

z

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