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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 (4WD)REMOVAL 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.
  1. Raise and support the vehicle. Refer to JACKING AND LIFTING in General Information.
  2. Remove the front skid plate bolt.
  3. Remove the front skid plate.
    Fig 1: Removing Engine Oil Cooler Hose/Pipe (4WD)
    G01978143Courtesy of GENERAL MOTORS CORP.

    Important:  Have a drain pan ready for the engine oil to drain into.

  4. Remove the bolt from the remote oil filter adapter.
  5. Remove and discard the seals.
    Fig 2: Removing Remote Oil Filter Adapter
    G01978144Courtesy of GENERAL MOTORS CORP.
  6. Lower vehicle.
  7. Remove air cleaner assembly.
  8. Remove the engine oil cooler line retaining rings from the engine oil cooler line quick connectors at the radiator engine oil cooler inlet and outlet. Follow the next 2 steps for the proper retaining ring removal procedure.
    Fig 3: Removing Engine Oil Cooler Lines From Radiator
    G01978145Courtesy of GENERAL MOTORS CORP.
  9. 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.
  10. 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.

  11. Remove the engine oil cooler lines from the quick connectors at the radiator engine oil cooler inlet and outlet.

    Pull the lines straight out from the connectors.

  12. Remove the engine oil cooler lines from the vehicle.
    Fig 4: Removing Engine Oil Cooler Lines From Vehicle
    G01978146Courtesy of GENERAL MOTORS CORP.

    Important:  Have a drain pan ready for the engine oil to drain into.

  13. Remove the bolt attaching the remote engine oil filter lines (engine mounted) adapter to drain the engine oil.
  14. Hold the remote engine oil filter lines below the remote engine oil filter lines (engine mounted) adapter to drain the engine oil.
  15. Remove and discard the seals.
    Fig 5: Removing Engine Oil Cooler Lines
    G01978147Courtesy of GENERAL MOTORS CORP.
  16. Remove the bolt attaching the remote engine oil filter lines to the remote engine oil filter lines (engine mounted) adapter.
  17. Remove and discard the seals.
  18. Clean all of the components in a suitable solvent, and dry them with compressed air.
  19. Inspect the fittings, the connectors, the cooler lines, the cooler, the filter lines, and the remote filter adapter for damage, distortion, or restriction. Replace parts as necessary.
  20. Flush the engine oil cooler, the engine oil cooler lines, the remote engine oil filter adapter, and the remote engine oil filter lines with the same type of engine oil normally circulating through the engine.
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.