Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 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 .
Remove the powertrain control module (PCM) retaining bolts (3) and nuts (6).

Fig 1: View Of PCM Assembly
Courtesy of GENERAL MOTORS CORP.
Remove the PCM mounting studs (5) and position the PCM out of the way.
Disconnect the engine coolant temperature (ECT) sensor electrical connector (1).

Fig 2: View Of Engine Coolant Temperature Electrical Connector
Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to FUEL & EVAPORATIVE EMISSION (EVAP) HOSE/PIPE CONNECTION CLEANING NOTICE in Cautions and Notices.
Disconnect the fuel feed (1) and fuel return (2) pipes from the fuel rail. Refer to FUEL LINE DISCONNECT FITTINGS .

Fig 3: Fuel Feed And Fuel Return Pipes (Left Side Of Engine)
Courtesy of GENERAL MOTORS CORP.
Disconnect the integral clip (3) from the wire harness bracket.
Remove the engine wire harness bracket bolt.

Fig 4: View of Engine Wire Harness Bracket & Bolt
Courtesy of GENERAL MOTORS CORP.
Position the engine electrical wire harness bracket with wires attached out of the way.
Remove the coolant heater cord from the heater (2).

Fig 5: View Of Coolant Heater Cord
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Do not score the surface of the engine block hole when removing the coolant heater.
Remove the coolant heater from the block.

Fig 6: View Of Coolant Heater (LL8)
Courtesy of GENERAL MOTORS CORP.