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 455 (ENGINE MECHANICAL)REPAIR INSTRUCTIONSOFF-VEHICLE REPAIR INSTRUCTIONSOIL COOLER INSTALLATION

1999 GMC Forward Control 5.7 R, Automatic

Oil Cooler Installation

1999 GMC Forward Control 5.7 R, AutomaticSECTION Oil Cooler Installation

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.

Install the oil cooler hose fitting.
Tighten

Tighten the oil cooler hose fitting to 19 N.m (14 lb ft).

Fig 1: Installing Oil Cooler Hose Fitting
Courtesy of GENERAL MOTORS CORP.
Install the oil cooler inlet hose clamp and the oil cooler inlet hose onto the oil cooler hose fitting.

Fig 2: Installing Oil Cooler Inlet Hose
Courtesy of GENERAL MOTORS CORP.
Install the oil cooler inlet hose clamp and oil cooler.

Fig 3: Installing Oil Cooler
Courtesy of GENERAL MOTORS CORP.
Install the oil cooler connector.
Tighten

Tighten the oil cooler connector to 50 N.m (37 lb ft).

Fig 4: Installing Oil Cooler Connector
Courtesy of GENERAL MOTORS CORP.
Install the oil cooler outlet hoses and pipe.
Connect the lower oil cooler outlet hose to the oil cooler.
Connect the upper oil cooler hose to the thermostat bypass pipe.

Fig 5: Installing Oil Cooler Outlet Hoses And Pipe
Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

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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.