Coolant Heater Replacement

Coolant Heater Replacement

Removal Procedure
1. Drain the cooling system
2. Raise and support the vehicle. Refer to Vehicle Lifting.





3. Disconnect the coolant heater cord from the coolant heater.
4. Loosen the bolt at the coolant heater but DO NOT remove the coolant heater bolt.
5. Remove the coolant heater.
6. Remove and clean any burrs, compound, paint, or rough spots from the core plug hole.

Installation Procedure





1. Apply GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the following:
^ Engine block heater seal
^ Cleaned surface of the engine block heater hole
2. Install the coolant heater by pushing tight to the block.





3. Position the engine coolant heater element at the 9 o'clock position (2).
Final installed position between 10 o'clock (1) and 8 o'clock (3) is acceptable.

Notice: Refer to Fastener Notice in Service Precautions.

4. Tighten the coolant heater bolt until both locking wings draw tight against the inner wall of the engine block.
Tighten the coolant heater bolt to 2 Nm (17 inch lbs.).
5. Install the coolant heater cord to the coolant heater.
6. Fill the cooling system.