Hummer H3. Manual — part 1266

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

procedure.

O-RING REPLACEMENT

Removal Procedure

Fig. 13: Disassembling/Reassembling A/C Line Fittings
Courtesy of GENERAL MOTORS CORP.

between the A/C line and the A/C component.

2007 Hummer H3

2007 HVAC Heating, Ventilation and Air Conditioning - H3

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

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

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.

2007 Hummer H3

2007 HVAC Heating, Ventilation and Air Conditioning - H3

Fig. 14: Identifying Proper Seating Of A/C Refrigerant O-Ring
Courtesy of GENERAL MOTORS CORP.

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

2007 Hummer H3

2007 HVAC Heating, Ventilation and Air Conditioning - H3

Fig. 15: Disassembling/Reassembling A/C Line Fittings
Courtesy of GENERAL MOTORS CORP.

7. Assemble the A/C components.

Refer to the appropriate repair procedure.

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

For banjo style fittings install the bolt retaining the banjo type fitting and tighten to

2007 Hummer H3

2007 HVAC Heating, Ventilation and Air Conditioning - H3