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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 977 (Engine Cooling System) >> Repair Instructions >> Coolant Heater Replacement (4.8L, 5.3L, and 6.0L) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Drain the cooling system. Refer to Draining and Filling Cooling System (with HP2)  or Draining and Filling Cooling System (without HP2) .
  2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Disconnect the coolant heater electrical connector (2).
    4. Fig 1: Identifying Coolant Heater Cord & Electrical Connector
    GM661139Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not score the surface of the engine block hole when removing the coolant heater.
  4. Remove the coolant heater from the engine block.
    5. Fig 2: View Of Coolant Heater (4.8L, 5.3L & 6.0L)
    GM661276Courtesy of GENERAL MOTORS CORP.
  5. Remove any burrs, sealer, paint or other rough spots.
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