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by Old School on September 1st, 2009
A thermostat usually fails either by sticking open (causing the engine to run cool and the heater to perform poorly) or by sticking shut (causing the engine to overheat).
A water pump usually fails either by leaking (which you can spot visually) or because the shaft bearings fail. You can see/feel the 'play' in the shaft, and the pump will frequently make nasty noises as it turns.
It is uncommon for water pumps to fail internally with no external signs that they've gone bad.
by MyGiveaDamnsBusted on September 1st, 2009
To get better answers you should include the actual problem you are having with your vehicle.
What sound does your engine make?
by Weylon on October 2nd, 2011
| 4 people like this
where do i add power steering fluid in my 2004 chevy malibu
by chevytruck39 on June 29th, 2011
| 1 person likes this
'97 350 new crank,rod,main bearings,timing,gears,plugs,wires now has a runs good but has a burp like as misfire but not all the time.HELP
by weld on August 10th, 2011
| 1 person likes this
i have a 99 chevrolet suburban, i can crank it but it wont stay on. whats theproblem
by Brandee_L9432 on September 3rd, 2011
| 1 person likes this
my 1994 chevy surban wont start
by creeper911 on April 27th, 2011
| 1 person likes this
You're reading How do I know for sure if I need to replace the thermostat on my truck forand not the water pump.
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