Leaking waer pump

[intel_guy]

Funny. I noticed a sponsored link at the bottom of another water pump thread for a class action investigation of GM for using dex cool.

Anyways... my local chevy dealer wants $170(labor only) to install a new delco water pump into my 99 Silverado 4.8. I have been told that the AC has to be disconnected(freon recovery) to get the water pump off. Is this true? I'd do it myself, but not if AC is involved.

[nathank]

Bump... anyone have an answer to this?

[Rammer500]

Here's directions:

Drain the cooling system.
Loosen the air cleaner outlet duct clamps at the following locations:
Throttle body
Mass airflow/intake air temperature (MAF/IAT) sensor
Remove the radiator inlet hose clip from the outlet duct.
Remove the air cleaner outlet duct.

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

Reposition the inlet hose clamp at the water pump.
Remove the inlet hose from the water pump.
Remove the fan blade.
Remove the accessory drive belt.

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

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

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

Remove the water pump bolts.
Remove the water pump and gaskets.
Discard the water pump gaskets.
Installation Procedure

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

Install the water pump and NEW gaskets. Notice: Refer to Fastener Notice in Service Precautions.
Install the water pump bolts.
2.1. Tighten the water pump bolts a first pass to 15 Nm (11 ft. lbs.) .
2.2. Tighten the water pump bolts a final pass to 30 Nm (22 ft. lbs.) .

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

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

Install the outlet hose to the water pump.
Position the outlet hose clamp at the water pump.
Install the accessory drive belt.
Install the fan blade.

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

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

Important: Align the arrow at the throttle body end of the duct with the throttle body attaching stud.

Install the air cleaner outlet duct.
Install the radiator inlet hose clip to the outlet duct.
Tighten the air cleaner outlet duct clamps at the following locations:
Throttle body
MAF/IAT sensor
Tighten the air cleaner outlet duct clamp screws to 7 Nm (62 inch lbs.) .
Fill the cooling system

[nathank]

Thanks Rammer, looks like any other water pump install. I just wondered if that A/C comment had any credibility.

Thanks for the very detailed instructions!

[Elbert]

Originally Posted by intel_guy

Funny. I noticed a sponsored link at the bottom of another water pump thread for a class action investigation of GM for using dex cool.

Anyways... my local chevy dealer wants $170(labor only) to install a new delco water pump into my 99 Silverado 4.8. I have been told that the AC has to be disconnected(freon recovery) to get the water pump off. Is this true? I'd do it myself, but not if AC is involved.

I don't see why the A/C system would have to be screwed with at all.

[nathank]

Swapped the water pump yesterday, not much to it at all except for unscrewing that dang fan off the pulley.... that was not fun.

Thanks for the help!