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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 492 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSENGINE OIL COOLER PIPE/HOSE QUICK CONNECT FITTINGREMOVAL PROCEDURE

1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

Disengage the plastic caps from the quick connect fittings. Pull the caps back along the pipe.
Using a bent-tip screwdriver or equivalent, pull on one of the open ends of the retaining ring in order to rotate the retaining ring.
Rotate the retaining ring around the quick connector until the retaining ring is out of position and can be completely removed.
Discard the retaining rings.

Fig 1: Removing Retaining Rings
Courtesy of GENERAL MOTORS CORP.
Remove the engine oil cooler line from the quick connector fitting at the radiator.
Pull the lines straight out from the connectors.
Clean all of the components in a suitable solvent, and dry them with compressed air.
Inspect the fittings, the connectors, the cooler lines, and the cooler for damage, distortion, or restriction. Replace parts as necessary.

Fig 2: Removing Engine Oil Cooler Line From Quick Connector
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.