Coolant Heater Replacement

Coolant Heater Replacement (3.8L)

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.
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 a coat of GM P/N 12346004 thread sealant with Teflon or equivalent 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.

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 (18 inch lbs.).

Notice: Refer to Fastener Notice in Service Precautions.

5. Connect the coolant heater cord to the coolant heater.
6. Fill the cooling system.
7. Inspect for leaks.