Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET1999PICKUP K1500, 5.7 RREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 449 (HEATING, VENTILATION AND AIR CONDITIONING)REPAIR INSTRUCTIONSO-RING REPLACEMENTINSTALLATION PROCEDURE

1999 Chevrolet Pickup K1500, 5.7 R

Installation Procedure

1999 Chevrolet Pickup K1500, 5.7 RSECTION Installation Procedure

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the new O-ring seal for any sign or cracks, cuts, or damage. Replace if necessary.
Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the A/C refrigerant components.
Important: DO NOT allow any of the mineral base 525 viscosity refrigerant oil on the new O-ring seal to enter the refrigerant system.
Lightly coat the new O-ring seal with mineral base 525 viscosity refrigerant oil.
Important: DO NOT reuse O-ring seals.
Carefully slide the new O-ring seal onto the A/C refrigerant component.
The O-ring seal must be fully seated.

Fig 1: Installing Procedure O-Ring
Courtesy of GENERAL MOTORS CORP.
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 specification.
Fig 2: Installing Procedure O-Ring
Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.