Water Pump: Service and Repair

REMOVAL PROCEDURE

Notice: When adding coolant, use DEX-COOL 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.

Caution: Refer to Battery Disconnect Caution in Service Precautions.





1. Disconnect the negative battery cable.
2. Drain the cooling system. Recover the coolant. Refer to Service and Repair.
3. Loosen the attaching bolts of the coolant pump pulley.
4. Remove the accessory drive belt.
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





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 ft. lbs.).

Notice: Refer to Fastener Notice in Service Precautions.





2. Install the coolant pump pulley and the bolts.
^ Tighten the bolts to 30 Nm (22 ft. lbs.).
3. Install the accessory drive belt.
4. Refill the cooling system. Refer to Service and Repair.
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.