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The first sign will probably be that the car overheats. No coolant circulating = hot motor. This is a bad thing.

If you can hear any noise from the pump, (clicking, squealing) it's probably on it's way out.

If you can grab the pulley, shake it back and forth and in and out. Any play usually means it's failing.

If you can get at your radiator cap, with the car dead cold, remove the cap. Start the car and look into the radiator fill pipe. You should see coolant circulating briskly. If you don't, the pump is probably dead, or nearly so.

Overheating can mean that you are loosing coolant somewhere. I can be from the pump. It can also be from the reservoir or a hose connection. With the car at operating temperature, check for any coolant or steam escaping from the reservoir, the hoses and their connections. Turn the car off and take a few minutes to watch for leaks again. When the car has been turned off, the temp and steam pressure can increase and cause leaks that you can't see when it's running.

Tighten connections and/or replace hoses as is necessary.

If all else fails, take her to your mechanic for a diagnostic.

FriPilot

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15y ago
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Q: How do you know the water pump is bad on a 2.2L 2000 Sunfire?
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