Water Pump Cleaning and Inspection (LS3, L99, or LSA)
WARNING: This page is about a different variant/trim than selected.
- Remove the old gasket from the water pump sealing surfaces. Refer to Replacing Engine Gaskets .
- Clean all excess dirt and debris from the water pump housing.
- Inspect the water pump (1) for the following conditions:
- Gasket and hose sealing surfaces for excessive scratches or gouging
- Restrictions within the internal coolant passages
- Excessive side-to-side play in the pulley shaft
- Leakage at the water inlet housing or rear cover gasket
- Leakage at the water pump vent hole
A stain around the vent hole is acceptable. If leakage, dripping, occurs with the engine running and the cooling system pressurized, replace the water pump.
- Wear or damage in the belt tracking area of the pulley