Anyone ever replaced a water pump on a GMT800 truck?

My water pump is leaking coolant out of the weep hole on the bottom. So I'm guessing I should replace it. What all is involved in replacing a water pump? I'd also like to flush the cooling system before I install the new pump, or right as I'm installing the pump. What all is involved in that? And should I use Dex cool coolant or will any anitfreeze be fine?

Give these a look Scott, seemed pretty informative.

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I'd stick with Dex. I just flush fresh water through the system hoses. Flush water through the heater core. Flush it through the block. Flush the radiator.

Here's the procedure without pics.


Water Pump Replacement (4.8L, 5.3L, and 6.0L Engines)
Removal Procedure



1. Drain the cooling system.
2. Loosen the air cleaner outlet duct clamps at the following locations:

o Throttle body
o Mass Airflow/Intake Air Temperature (MAF/IAT) sensor

3. Remove the radiator inlet hose clip from the outlet duct.
4. Remove the air cleaner outlet duct.



5. If necessary, remove the engine sight shield.
6. Remove the radiator vent inlet hose from the radiator hose clips.



7. Reposition the inlet hose clamp at the water pump.
8. Remove the inlet hose from the water pump.
9. Remove the fan blade.
10. Remove the accessory drive belt. Replacement - Accessory (4.8L, 5.3L, and 6.0L Engines) Drive Belt Replacement - Accessory (5.3L Engine w/RPO HP2) in Engine Mechanical - 4.8L, 5.3L, and 6.0L.



11. Reposition the outlet hose clamp at the water pump.
12. Remove the outlet hose from the water pump.



13. Reposition the surge tank outlet hose clamp at the water pump.
14. Remove the surge tank outlet hose from the water pump.



15. Reposition the heater inlet hose clamp at the water pump.
16. Remove the heater inlet hose from the water pump.



17. Remove the water pump bolts.
18. Remove the water pump and gaskets.
19. Discard the water pump gaskets.

Installation Procedure

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



1. Install the water pump and NEW gaskets. Notice: Refer to Fastener Notice in Service Precautions.
2. Install the water pump bolts.

1. Tighten the bolts a first pass to 15 Nm (11 ft. lbs.) .
2. Tighten the bolts a final pass to 30 Nm (22 ft. lbs.) .



3. Install the heater inlet hose to the water pump.
4. Position the heater inlet hose clamp at the water pump.



5. Install the surge tank outlet hose to the water pump.
6. Position the surge tank outlet hose clamp at the water pump.



7. Install the outlet hose to the water pump.
8. Position the outlet hose clamp at the water pump.
9. Install the accessory drive belt. Replacement - Accessory (4.8L, 5.3L, and 6.0L Engines) Drive Belt Replacement - Accessory (5.3L Engine w/RPO HP2) in Engine Mechanical - 4.8L, 5.3L, and 6.0L.
10. Install the fan blade.



11. Install the inlet hose to the water pump.
12. Position the inlet hose clamp at the water pump.



13. Install the engine vent inlet hose to the radiator hose clips.
14. If necessary, install the engine sight shield.



15. Important: Align the arrow at the throttle body end of the duct with the throttle body attaching stud. Install the air cleaner outlet duct.
16. Install the radiator inlet hose clip to the outlet duct.
17. Tighten the air cleaner outlet duct clamps at the following locations:

o Throttle body
o MAF/IAT sensor Tighten the clamps to 7 Nm (62 inch lbs.) .

18. Fill the cooling system.

Thanks! Should be really easy after watching those videos .

It'd not bad.