GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 423360  Size: SH
  1. On the diesel and small block gas engines remove the nuts and washers retaining the clip to the stud.

  2. Object Number: 423361  Size: SH
  3. On the large block gas engine remove the bolt and washer retaining the cord clip to the shock bracket.
  4. Remove the strap connecting the cord to the heater hose.
  5. Remove the cord from the engine block heater.

Installation Procedure

    Caution: A block heater electrical cord that is damaged creates a shock hazard, and must be replaced.


    Object Number: 423361  Size: SH
  1. Apply lubricant to the front face of the heater cord connector, and connect heater cord to the block heater.
  2. Route the heater cord along the heater hose.
  3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. On the large block gas engine install the washer to the shock bracket; then install the cord clip and finally the bolt retaining the cord to the bracket.
  5. Tighten
    Tighten the bolt retaining the engine coolant heater cord bracket to the engine to 8 N·m (6 lb ft).


    Object Number: 423360  Size: SH
  6. On the diesel and small block gas engines, install the cord clip, then the washers and nuts, at both the shock lower bracket and frame member.
  7. Install the bolt (5) retaining the cord clip (6) to the bracket (2).
  8. Tighten
    Tighten the bolt retaining the engine coolant heater cord clip to the bracket to 12 N·m (106 lb in).