Removal Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Drain the engine coolant. Refer to DRAINING AND FILLING COOLING SYSTEM (BODY VIN CODE 6) or DRAINING AND FILLING COOLING SYSTEM (BODY VIN CODE 3) .
Remove the PCM. Refer to POWERTRAIN CONTROL MODULE .
Remove the harnesses from the engine harness bracket.
Remove the bolt that secures the engine harness bracket and remove the bracket.

Fig 1: Removing Harnesses From Engine Harness Bracket (4.2L Engine)
Courtesy of GENERAL MOTORS CORP.
Remove the coolant heater cord from the heater (2).

Fig 2: Removing Coolant Heater Cord From Heater (4.2L Engine)
Courtesy of GENERAL MOTORS CORP.
Remove the coolant heater from the block.

Fig 3: Removing Coolant Heater From Block (4.2L Engine)
Courtesy of GENERAL MOTORS CORP.