GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 185957  Size: SH
  1. Drain the engine coolant. Refer to Cooling System Draining and Filling .
  2. Remove the transaxle brace to the engine assembly. Refer to Transaxle Brace Replacement in Transaxle.
  3. Remove the cord from the engine coolant heater.

  4. Object Number: 185960  Size: SH
  5. Loosen the bolt at the engine coolant heater but do not remove.
  6. Remove the engine coolant heater.
  7. Remove and clean any burrs, compound, paint, or rough spots from the core plug hole.

Installation Procedure


    Object Number: 185960  Size: SH
  1. Apply a coat of Permatex® Thread Sealant with Teflon to the O-ring and clean the surface of the plug opening.
  2. Install the coolant heater by pushing tight to the block.
  3. Install the coolant heater so the element is positioned as shown.

  4. Object Number: 185959  Size: SH

    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.

  5. Tighten the bolt until both locking wings draw tight against the inner wall of the engine block.
  6. Tighten
    Tighten the bolt to 2 N·m (17 lb in).


    Object Number: 185957  Size: SH

    Notice: The heater cord must not touch the engine, hot pipes, manifold, or any moving parts. Route the cord to the left front of the engine compartment securing with tie straps as necessary to prevent damage.

  7. Install the heater cord to the engine coolant heater.
  8. Fill the engine cooling system. Refer to Cooling System Draining and Filling .