Chevrolet Silverado / GMC Sierra. Service 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