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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> External Pages >> Different car >> Section 412 (Engine Cooling System) >> Repair Instructions >> Coolant Heater Replacement (4.8L, 5.3L, and 6.0L Engines) >> Removal Procedure

Removal Procedure

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    Fig 1: Identifying Oil Pan Skid Plate
    GM309158Courtesy of GENERAL MOTORS CORP.
  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.
    4. Fig 2: View Of Oil Cooler Hose Adapter, Bolts & Gasket
    GM846669Courtesy 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.
    8. Fig 3: Identifying Coolant Heater Cord & Electrical Connector
    GM661139Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the coolant heater electrical connector (2).
    9. Fig 4: View Of Coolant Heater At Engine Block (4.8L, 5.3L & 6.0L)
    GM661276Courtesy 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.
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