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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 492 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSENGINE OIL COOLER HOSE/PIPE REPLACEMENT (2WD)INSTALLATION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation 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.

Important:  When performing the following procedure, do not reuse the old retaining rings. Replace the old retaining rings with new ones.

  1. Install a new retaining ring (E-clip) into each quick connector at the radiator engine oil cooler by following the next 3 steps.
  2. Hook one of the open ends of the retaining ring in one of the slots in the quick connector.
  3. Rotate the retaining ring around the connector until the retaining ring is positioned with all 3 ears through the 3 slots.
  4. Ensure the 3 retaining ring ears can be seen from the inside of the connector and the retaining ring can move freely in the slots.
  5. Install the engine oil cooler lines into the quick connectors at the radiator engine oil cooler inlet and outlet until a click is heard or felt.

    Pull back on the engine oil cooler lines to ensure a proper connection.

  6. Install air cleaner assembly.
  7. Raise the vehicle.
    Fig 1: Installing Engine Oil Cooler Lines
    G01978139Courtesy of GENERAL MOTORS CORP.
  8. Install new seals on the engine oil cooler lines at the engine oil filter adapter ends.
    Fig 2: Installing New Seals On Engine Oil Cooler Lines
    G01978140Courtesy 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.