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  • Chevy Astro
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  • 1982-1994 Chevy Cavaliers

How do you replace the water pump on a 1998 Chevy Astro?

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βˆ™ 2015-07-16 18:06:18

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Remove the air cleaner assembly (must), remove the top half of the fan shroud (must), remove the top radiator hose (optional). I'm assuming you can figure out how to remove these items in my first sentence. If you can't, no offense, but in my opinion you have no business doing this job to start with. BEFORE you remove the serpentine belt, use a large wrench to unscrew the thermostatic clutch fan assembly from the water pump. If you don't, you will need a special tool (or you can make one as I did) to get the thermostatic clutch fan assembly off the water pump because once you remove the water pump you have no good way to hold the smooth pulley while you remove the fan assembly. This I know from experience. Just in case you don't know, you use a 3/8 ratchet inserted in the square hole of the belt tensioner to loosen the belt while you remove it. The water pump should now be accessable. There are 2 bolts on the left and 2 bolts on the right that hold the water pump to the front of the engine block. After removing the water pump you will need to remove the smooth pulley from the old pump and install it on the new one. Scrape any old gasket material off the engine block around the inlet and outlet where the water pump was mounted. and good luck.

I think that the serpentine belt should also be replaced. Good opportunity to do it.

No one ever seems to mention which way to turn the thermostatic fan. Is it normal thread or reverse threaded?

Im currently having a problem removing my fan and I cannot tell which way it should be turned.

the thread is standard..ccw to unscrew..

I agree...it is standard...I just did mine yesterday. It was a pain to get off though...I ended up taking the whole water pump, fancluch, and fan out as a unit while it was still assembled (be careful not to ding the radiator). Then I took the back cover off the water pump.....then i stuck a socket into one of the blades to jam it in place.....this made it easy to get the cluch off. I know this was not the correct proceedure....but..heh...i was desparate..and it worked!

2015-07-16 18:06:18
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