Water Pump: Service and Repair

Removal Procedure

Caution: Refer to Battery Disconnect Caution in Service Precautions.

Notice: When adding coolant, use DEX-COOL (R) coolant. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner-at 50,000 km (30,000 mi) or 24 months.





1. Disconnect the negative battery cable.
2. Drain the cooling system. Recover the coolant. Refer to Draining and Filling Cooling System.
3. Loosen the attaching bolts of the coolant pump pulley.
4. Remove the accessory drive belt. Refer to Drive Belt Replacement.
5. Remove the attaching bolts of the coolant pump pulley.
6. Remove the coolant pump pulley.
7. Remove the surge tank hose.





8. Remove the attaching bolts of the coolant pump.
9. Remove the coolant pump and the gasket.
10. Completely clean the sealing surfaces of the coolant pump and the engine block.

Installation Procedure

Notice: Refer to Fastener Notice in Service Precautions.





1. Using a new gasket, install the coolant pump and the attaching bolts. Coat the bolt threads with pipe sealant GM P/N 12346004, or equivalent.
^ Tighten the coolant pump bolts to 25 Nm (18 lb ft).





2. Install the coolant pump pulley and the bolts.
^ Tighten the bolts to 30 Nm (22 lb ft).
3. Install the accessory drive belt. Refer to Drive Belt Replacement.
4. Refill the cooling system. Refer to Draining and Filling Cooling System.
5. Connect the negative battery cable.
6. Start the engine. After the engine reaches normal operating temperature, check for coolant leaks.
7. Inspect for leaks.