Coolant Heater Replacement

REMOVAL PROCEDURE





1. Drain the cooling system.
2. Raise and suitably support the vehicle.
3. Disconnect the engine coolant heater cord from the engine coolant heater.
4. Loosen the engine coolant heater bolt. Do not remove the engine coolant heater bolt.
5. Remove the engine coolant heater.
6. Clean the engine coolant heater opening.

INSTALLATION PROCEDURE





1. Coat the following components with the lubricant GM P/N 12345996 or the equivalent:
^ The engine block heater seal
^ The cleaned surface of the engine block heater hole





2. Install the engine coolant heater. Position the engine coolant heater element at the 9 O'clock position (2), as shown.
Final installed position between 8 O'clock (1) and 10 O'clock (3) is acceptable.
3. Tighten the engine coolant heater bolt until both locking wings draw tight against the inner wall of the engine block.
^ Tighten the engine coolant heater bolt to 2 Nm (18 inch lbs.).

Notice: Refer to Fastener Notice in Service Precautions.

4. The engine coolant heater cord must not touch the engine, hot pipes, manifold, or any moving parts. Secure the engine coolant heater cord with tie straps as required.
Connect the engine coolant heater cord to the engine coolant heater.
5. Lower the vehicle.
6. Fill the engine cooling system.
7. Inspect for leaks.