Removal Procedure
- Drain the engine coolant. Refer to Draining, Filling, Recovery of the Cooling System in Engine Cooling.
- Disconnect the cord from the engine coolant heater.
- Loosen the bolt.
- Remove the engine coolant heater.
- Clean the core plug hole. Remove any burrs, compound, paint, or rough spots.
Installation Procedure
- Apply a coating of lubricant to the O-ring seal and the clean surface of the plug opening in the block. Use a water spray-resistant, high-temperature grease (GM P/N 9985164 or the equivalent).
- Install the coolant heater. Push it tight to the block.
- Tighten the bolt until both locking wings draw tight against the inner wall of the engine block.
- Connect the heater cord to the coolant heater. Route the heater cord to a convenient place in the engine compartment.
- Fill the engine with coolant. Refer to section Draining, Filling, Recovery of the Cooling System in Engine Cooling.
- Check the system for leaks.
Important: Install the heater element in the correct direction. Avoid element contact with the inside walls of the engine block.
Tighten
Tighten the bolt to 1.8 N·m (16 lb in).
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.
Important: The heater cord must not touch the engine, any hot pipes, the manifold, or any moving parts.
