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2004 impala overheating. How do I know if my water pump is bad?

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Let the engine cool down then remove the radiator cap. With the cap off, start the engine and let it idle. Watch the water in the radiator. As the engine heats up, the water will rise as it expands during heating. When the thermostat opens, (and this may be your problem) the level will drop, and you will be able to see the water recirculating through the radiator. If this doesn't happen, the thermostat is not opening (stuck closed). If you can see the water recirculating when you start the cold engine, then the thermostat is stuck open. Either condition will cause overheating. Start with the easy fix first (thermostat) before going to the water pump.

Posted on May 11, 2014


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Posted on Jan 02, 2017

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SOURCE: the location on my water pump

right on the front of the engine !!!!!!!!

Posted on Apr 22, 2009

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SOURCE: 2004 mercury sable keep overheating. replaced drive belt and thermostat. now water pump appears to be leaking.

Don't mind helping but there are several pictures as well as written instructions. To much to cut, paste and all that stuff on fixya plus there is a size limit on pictures as well. If you want, email me directly at with your vehicle information (year, make, model) and I will be happy to make up a PDF and email it to you with pretty detailed instructions and pictures. It won't cost you anything but will need to know if the 8th digit of your VIN is a S, 2 or a U so I'm sure I give you the right information.

Posted on Jul 15, 2012

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SOURCE: I have a 2004 Chevy impala 3.4 engine. I have

have u checked the fans and fan relays to see if working properly was a flush done [possible blockage in engine passages]

Posted on Dec 04, 2012

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SOURCE: 2004 envoychanged the water pump, fan clutch, radiator, thermostat and it's still overheating .fan not running

Your cooling fan relay is bad.

Posted on Mar 24, 2013

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SOURCE: My friend has a 2004 Chevy Impala and he has had

What work was done exactly?

Posted on Aug 10, 2013

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My 2004 Impala keeps overheating. it says coolent temp hot. i dont smell anything thing nor do i see any type of smoke or steam. i had thermastat replace and ignition wire replace but no luck. the car...

There are other things to be checked, such as the radiator fan and the water pump. You would need to find out if the fan is coming on at 220 degrees and if the pump is pulling coolant thru the radiator.

Feb 28, 2014 | 2004 Chevrolet Impala

1 Answer

How do i know if my water pump is bad

well some will make noise from the waterpump bearing integral to the pump itself,and you should see coolant underneath of it

Feb 17, 2013 | 2004 Chevrolet Impala

1 Answer

2001 impala overheating replaced water pump ,thermostat,after driving 6 miles heater stops blowing warm air car overheats?

sounds like head gasket, shes putting pressure out into your rad, check your big hose when idling see if they swell up with pressure,another way to check is to leave rad cap loose.

Dec 23, 2012 | 2004 Chevrolet Impala

1 Answer

My car keeps overheating..what keep causing this??

CHANGE THERMOSTAT or maybe bad water pump? could be pluged heater core

Mar 27, 2012 | 2001 Chevrolet Impala

1 Answer

My car started overheating. I was almost out of antifreeze, but my reserve tank still had antifreeze. Put a sealant in the radiator believing there was a leak, as well as the 50/50 mix, but it still ran...

Not likely water pump unless pump is leaking. You need to figure out where the antifreeze leaked out. Can you see anything leaking with radiator full and engine running? I have some tips at if you want to troubleshoot. Let me know if you have questions.

Sep 10, 2010 | 2004 Chevrolet Impala

1 Answer

2000 3.8 Impala keeps overheating even after changing thermostat. Did not overheat after short trips, after changing it, but started back after driving over 20 miles. Temp gauge goes to red and coolant...

Sounds like there could be an air pocket in your cooling system. If the job was done by a mechanic take it back. If a "friend" helped you, tell him to rebleed the system. Also seems like your water pump might be bad. If it was overheating before changing the thermostat and is still doing the problem only worse then I would assume the pump needs to be changed. If the pump is bad, there is no doubt that air is in the system still and causing the overheating to occur even faster.

Sep 28, 2009 | 2001 Chevrolet Impala

1 Answer

The location on my water pump

right on the front of the engine !!!!!!!!

Apr 22, 2009 | 2004 Chevrolet Impala

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