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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 800 (Engine Cooling System) >> Repair Instructions >> Coolant Heater Replacement (4.8L, 5.3L, and 6.0L Engines) >> Removal Procedure

Removal Procedure

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  1. Drain the cooling system/engine block. Refer to DRAINING AND FILLING COOLING SYSTEM  .
  2. Raise and suitably support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
  3. Remove the oil pan skid plate bolts and plate.
    Fig 1: Removing Oil Pan Skid Plate Bolts And Plate
    G02117843Courtesy of GENERAL MOTORS CORP.
  4. Remove the oil cooler hose bracket bolt.
  5. Remove the oil cooler hose adapter bolts.
  6. Remove and discard the oil cooler hose adapter gasket.
  7. Position the oil cooler hose adapter end out of the way.
    Fig 2: Removing Oil Cooler Hose Adapter
    G02117844Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the coolant heater electrical connector (2).
    Fig 3: Disconnecting Coolant Heater Electrical Connector
    G02117845Courtesy of GENERAL MOTORS CORP.

    Important:  Do not score the surface of the engine block hole when removing the coolant heater.

  9. Remove the coolant heater from the engine block.
  10. Remove any burrs, sealer, or other rough spots.
    Fig 4: Removing Coolant Heater From Engine Block
    G02117846Courtesy of GENERAL MOTORS CORP.
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