Removal Procedure
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Drain the cooling system. Refer to Draining and Filling Cooling System .
- Disconnect the heater cord from the coolant heater (4).
- Loosen the coolant heater bolt.
- Remove the coolant heater from the engine block.
- Do not score the machined surface of the hole.
- Grasp the plug with pliers.
- Pull the plug from the engine block.
- Clean the core plug hole in order to remove the following substances:
- Burrs
- Compound
- Paint
- Rough spots