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Old 29-10-2009   #1
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what causes a thermostat to fail and how do i check a water pump is working????

is there a way of checking the water pump operation?, ave changed the thermostat as my car was blowing cold air and now it heats up no problem.

reason for changing thermostat was a slight milky residue in my oil cap, apart from it not working either lol and understand that it is the most common failing of a head gasket.

car did give off a skrech when i had replaced the thermostat, i assume this was the water pump getting rid of the air in the system?

car heats up fine and sits and 1/4 most of the time and doesnt go above half.

what causes a thermostat to fail ?.

i am doing alot of work to this car, and im about to change the coils and ht leads as i have that annoying power loss to.

thanx for reading
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Old 29-10-2009   #2
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Re: what causes a thermostat to fail and how do i check a water pump is working????

Quote Originally Posted by chaos123007 View Post
i
what causes a thermostat to fail ?.
old age.

did you bleed system like it says in the guides? gauge should sit at half way all the time
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Old 29-10-2009   #3
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Re: what causes a thermostat to fail and how do i check a water pump is working????

Mine is in the middle of the gauge sometimes and only 1/4 at others. So the thermostat is on the way out. About 35 from Shop4Parts (plus postage) or best part of 50 from a Fiat dealer.
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Old 29-10-2009   #4
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Re: what causes a thermostat to fail and how do i check a water pump is working????

After flushing the rad, fitting new water pump & thermostat and having the head skimmed, mine now sits at 1/4 and doesnt seem to go above half.

Would have thought if the thermostat was on its way out it wouldnt open causing the car to run hot not the other way round???
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Old 29-10-2009   #5
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Re: what causes a thermostat to fail and how do i check a water pump is working????

when they are on the way out they normally open only a tiny bit and tempature sits at a quater instead of half
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Old 30-10-2009   #6
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Re: what causes a thermostat to fail and how do i check a water pump is working????

But mine is new and sit at 1/4? Surley if they dont open then the flow to the rad is reduced and the engine would run hotter?
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Last edited by Noddy; 30-10-2009 at 00:59.
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Old 30-10-2009   #7
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Re: what causes a thermostat to fail and how do i check a water pump is working????

if yours is new then you have another problem. the normal temperature is half way
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Old 30-10-2009   #8
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Re: what causes a thermostat to fail and how do i check a water pump is working????

Ok then a real test for your knowlege then:

Apart from the thermostat what else would cause the car to run cold???
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Old 30-10-2009   #9
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Re: what causes a thermostat to fail and how do i check a water pump is working????

loads of responses, i replaced my thermostat and it sits and 1/4 all the time, seems to be fine now, changed air filter to dnd cleaned throttle body, it was manky, found a few splits in the air hose so i patched it up.

got some milky residue in my oil cap, dummo whats causing it, its not the head gasket as the car runs fine and doesnt over heat
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Old 30-10-2009   #10
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Re: what causes a thermostat to fail and how do i check a water pump is working????

The gauge is only a gauge, not an instrument.

It could be the sender is out of spec.

Pop a meter on it to check.

Cheers

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Old 30-10-2009   #11
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Re: what causes a thermostat to fail and how do i check a water pump is working????

Quote Originally Posted by Spentona View Post
Ok then a real test for your knowlege then:

Apart from the thermostat what else would cause the car to run cold???
air lock
crud in the system
sensor
or the gauge its self
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