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 INSTRUCTIONSON-VEHICLE REPAIR INSTRUCTIONSOIL COOLER INLET LINE REPLACEMENTREMOVAL 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 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

Drain the engine coolant from the cooling system.
Refer to DRAINING AND FILLING COOLING SYSTEM .
Raise and support the vehicle.
Disconnect the knock sensor electrical connector.
Remove the oil filter. Refer to ENGINE OIL AND OIL FILTER REPLACEMENT .

Fig 1: Removing Oil Filter
Courtesy of GENERAL MOTORS CORP.
Disconnect the oil cooler outlet hose from the oil cooler.

Fig 2: Disconnecting Oil Cooler Outlet Hose From Oil Cooler
Courtesy of GENERAL MOTORS CORP.
Remove the oil cooler connector.

Fig 3: Removing Oil Cooler Connector
Courtesy of GENERAL MOTORS CORP.
Remove the oil cooler inlet hose clamp and the oil cooler.

Fig 4: Removing Oil Cooler
Courtesy of GENERAL MOTORS CORP.
Remove the oil cooler inlet hose clamp and oil cooler inlet hose from the oil cooler hose fitting.

Fig 5: Removing Oil Cooler Inlet Hose
Courtesy of GENERAL MOTORS CORP.
If necessary, remove the oil cooler hose fitting.

Fig 6: Removing Oil Cooler Hose Fitting
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.