Water Pump: Service and Repair

Water Pump Replacement (LH6) (5.3L)

Special Tools

J 38185 Hose Clamp Pliers

Removal Procedure




1. Drain the cooling system. Refer to Cooling System Draining and Filling (LH6) (Cooling System Draining and Filling)Cooling System Draining and Filling (LL8) (Cooling System Draining and Filling).
2. Loosen the air cleaner outlet duct clamps at the following locations:

* Throttle body
* Mass air flow (MAF)/intake air temperature (IAT) sensor

3. Remove the air cleaner outlet duct bolt and duct.
4. Remove the accessory drive belt tensioner. Refer to Drive Belt Tensioner Replacement - Accessory (Drive Belt Tensioner Replacement - Accessory).
5. Remove the cooling fan and shroud. Refer to Cooling Fan and Shroud Replacement (Service and Repair).




6. Using the J 38185 , reposition the inlet hose clamp at the water pump.
7. Remove the inlet hose from the water pump.




8. Using the J 38185 , reposition the outlet hose clamp at the water pump.
9. Remove the outlet hose from the water pump.




10. Remove the auxiliary heater inlet and outlet hose/pipe nut.
11. Using the J 38185 , reposition the throttle body hose clamp at the throttle body.
12. Remove the hose from the throttle body.
13. Using the J 38185 , reposition the auxiliary heater inlet and outlet hose/pipe clamps at the water pump.
14. Remove the inlet and outlet hoses/pipes from the water pump.




15. Remove the water pump bolts.
16. Remove the water pump and gaskets.
17. Discard the water pump gaskets.

Installation Procedure





Caution: Refer to Fastener Caution (Fastener Caution).

Note: All gasket surfaces are to be free of oil or other foreign material during assembly.

1. Install the water pump and NEW gaskets.
2. Install the water pump bolts.

* On the initial pass, tighten the bolts to 15 Nm (11 ft. lbs.).
* On the final pass, tighten the bolts to 30 Nm (22 ft. lbs.).




3. Install the auxiliary heater inlet and outlet hose/pipe nut and tighten to 10 Nm (89 in. lbs.).
4. Install the hose to the throttle body.
5. Using J 38185 , position the throttle body hose clamp at the throttle body.
6. Install the inlet and outlet hoses/pipes to the water pump.
7. Using J 38185 , position the auxiliary heater inlet and outlet hose/pipe clamps at the water pump.




8. Install the outlet hose to the water pump.
9. Using J 38185 , position the outlet hose clamp at the water pump.




10. Install the inlet hose to the water pump.
11. Using J 38185 , position the inlet hose clamp at the water pump.
12. Install the cooling fan and shroud. Refer to Cooling Fan and Shroud Replacement (Service and Repair).
13. Install the accessory drive belt tensioner. Refer to Drive Belt Tensioner Replacement - Accessory (Drive Belt Tensioner Replacement - Accessory).




14. Install the air cleaner outlet duct and bolt to tighten to 10 Nm (89 in. lbs.).
15. Tighten the air cleaner outlet duct clamps at the following locations:

* Throttle body
* MAF/IAT sensor
Tighten the clamps to7 Nm (62 in. lbs.).

16. Fill the cooling system. Refer to Cooling System Draining and Filling (LH6) (Cooling System Draining and Filling)Cooling System Draining and Filling (LL8) (Cooling System Draining and Filling).