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Installation Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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.
  2. If reusing the old coolant heater, apply thread sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the threads.
    3. Fig 1: Removing/Installing Coolant Heater From Block
    GM755435Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Component Fastener Tightening Notice in Cautions and Notices.
  3. Install the coolant heater to the engine block.

    Tighten:  Tighten the coolant heater to 50 N.m (37 lb ft).

    4. Fig 2: Removing/Installing Coolant Heater Cord From Heater
    GM755428Courtesy of GENERAL MOTORS CORP.
  4. Install the coolant heater cord to the heater (2).
  5. Properly position the engine electrical harness bracket to the intake manifold.
    6. Fig 3: Removing/Installing Engine Wire Harness Bracket
    GM1348786Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  6. Install the engine electrical harness bracket bolt.

    Tighten:  Tighten the bolt to 10 N.m (89 lb in).

    7. Fig 4: Fuel Feed And Fuel Return Pipes (Left Side Of Engine)
    GM730718Courtesy of GENERAL MOTORS CORP.
  7. Connect the integral clip (3) to the wire harness bracket.
  8. Connect the fuel feed (1) and fuel return (2) pipes to the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) in Engine Controls - 4.2L.
    9. Fig 5: View Of Engine Coolant Temperature Electrical Connector
    GM1288027Courtesy of GENERAL MOTORS CORP.
  9. Connect the ECT sensor electrical connector (1).
    10. Fig 6: View Of PCM Assembly
    GM1284769Courtesy of GENERAL MOTORS CORP.
  10. Install the PCM mounting studs (5) to the intake manifold.

    Tighten:  Tighten the studs to 6 N.m (53 lb in).

  11. Install the PCM (1) onto the studs (5).
  12. Install the PCM retaining bolts (3).

    Tighten:  Tighten the bolts to 8 N.m (71 lb in).

  13. Install the PCM retaining nuts (6).

    Tighten:  Tighten the nuts to 8 N.m (71 lb in).

  14. Fill the cooling system. Refer to Draining and Filling Cooling System (LL8)  or Draining and Filling Cooling System (LM4) .
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