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Home >> GMC >> 1999 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical - 4.3L V6, 5.0L, 5.7L & 7.4L V8 - VINS [W,X,M,R,J]) >> Removal & Installation >> Oil Cooler Lines (RWD) >> Removal

Oil Cooler Lines (RWD): Removal

WARNING: This page is about a different variant/trim than selected.
  1. Remove the engine oil cooler lines support clamp bolt. See Figure.
    NOTE: Have a drain pan ready for the engine oil to drain into.
  2. Remove the bolt attaching the engine oil cooler lines to the oil filter adapter. See Figure.
  3. Hold the cooler lines below the bottom of the radiator to drain the engine oil.
  4. Remove and discard the seals.
  5. 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. See Figure. Follow the next 2 steps for the proper retaining ring removal procedure.
  6. 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. See Figure.
  7. 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.
  8. 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. See Figure.
  9. Clean all of the components in a suitable solvent, and dry them with compressed air.
  10. Inspect the fittings, the connectors, the cooler lines, and the cooler for damage, distortion, or restriction. Replace parts as necessary.
  11. Flush the engine oil cooler and engine oil cooler lines with the same type of engine oil normally circulating through the engine.
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