Installation 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.

Remove any burrs, sealer, paint or other foreign material from the threads/sealing surface of the engine block and from the old coolant heater if the heater is to be reused.
If reusing the old coolant heater, apply thread sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the threads.
NOTE: Refer to COMPONENT FASTENER TIGHTENING NOTICE in Cautions and Notices.
Install the coolant heater to the engine block.
Tighten: Tighten the coolant heater to 50 N.m (37 lb ft).

Fig 1: View Of Coolant Heater (LL8)
Courtesy of GENERAL MOTORS CORP.
Install the coolant heater cord to the heater (2).

Fig 2: View Of Coolant Heater Cord
Courtesy of GENERAL MOTORS CORP.
Properly position the engine electrical harness bracket to the intake manifold.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Install the engine electrical harness bracket bolt.
Tighten: Tighten the bolt to 10 N.m (89 lb in).

Fig 3: View Of Engine Electrical Harness Bracket
Courtesy of GENERAL MOTORS CORP.
Connect the integral clip (3) to the wire harness bracket.

Fig 4: Fuel Feed And Fuel Return Pipes (Left Side Of Engine)
Courtesy of GENERAL MOTORS CORP.
Connect the fuel feed (1) and fuel return (2) pipes to the fuel rail. Refer to FUEL LINE DISCONNECT FITTINGS .
Connect the ECT sensor electrical connector (1).

Fig 5: View Of Engine Coolant Temperature Electrical Connector
Courtesy of GENERAL MOTORS CORP.
Install the PCM mounting studs (5) to the intake manifold.
Tighten: Tighten the studs to 6 N.m (53 lb in).

Fig 6: View Of PCM Assembly
Courtesy of GENERAL MOTORS CORP.
Install the PCM (1) onto the studs (5).
Install the PCM retaining bolts (3).
Tighten: Tighten the bolts to 8 N.m (71 lb in).
Install the PCM retaining nuts (6).
Tighten: Tighten the nuts to 8 N.m (71 lb in).
Fill the cooling system. Refer to Draining and Filling Cooling System .