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Chevrolet Silverado / GMC Sierra. Manual - part 2321
Fig. 37: Identifying Good And Bad Sealing Washer Positions
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)
2008 Chevrolet Silverado 1500
2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
5. Assemble the remaining A/C refrigerant components. Refer to the appropriate repair
procedure.
O-RING REPLACEMENT
Removal Procedure
Fig. 38: Disassembling/Reassembling A/C Line Fittings
Courtesy of GENERAL MOTORS CORP.
between the A/C line and the A/C component.
2008 Chevrolet Silverado 1500
2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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.
2008 Chevrolet Silverado 1500
2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 39: Identifying Proper Seating Of A/C Refrigerant O-Ring
Courtesy of GENERAL MOTORS CORP.
6. The O-ring seal must be fully seated.
2008 Chevrolet Silverado 1500
2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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