pretty much as it says in the subject,
my cars ove heating ive tested the fan and it works, how do i test the relay for the fan and wheres the thermostat?
any ideas?
Edited by Pugugly on 12/04/2009 at 23:48
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the thermostat will be usually between engine and radiator however
to test the switch ideally you need to run the engine up to warp heat and it should kick in,if not i just change the switch
you havent been using k seal like everyone else on here have you?
have you checked to confirm the radiator is getting warm so as to prove if keeping cold it is the thermostat?
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Is it overheating all the time or just in traffic? Does it boil or are you relying on the temperature gauge? Does the heater work OK?
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There could be more to this than meets the eye. During normal driving, especially in cool/cold weather, there's usually enough airflow through the radiator just from the movement of the car. The fan on my car normally only comes on after the car has been stationary for a considerable time.
As Peter.N says, exactly what symptoms does the car exhibit?
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it runs hot, i took the car to an MOT centre after driving it about 70 miles three days previous, the mot centre said they wouldnt touch it as it was overheating.
the temperature gauge never goes above halfway but it does feel very hot under the bonet. i changed the water in the radiator and then removed the bottom hose and there was fluid immediately pouring out so i assume that there is no air in the system. i removed the fan and tested as i said and it works,
how do i test the relay for the fan?
other than that i assume the thermostat is dodgey but if it was broke would it only go up to half way o would it even move at all?
thanks fo any help
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This post is weird.
Temp guage reads normal but underbonnet feels hot?
What other evidence do we have for overheating of this car?
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Chips??? lol am i missing something?
under the oil cap looks a little guncky but it had been standing for 8 months before i picked it up.
does that have anything to do with it. i assume by the temp gauge moving its not broken? does this mean the thermostat could still be broken?
and still what about the relay? could it be the water/oil pump maybe? how do i test these.
would a head gasket failure cause this problem
thanks again
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i changed the water in the radiator and then removed the bottom hose and there was fluid immediately pouring out so i assume that there is no air in the system.
Just because water comes out of the bottom hose it doesn't prove there isn't an airlock somewhere. And having a normal gauge reading isn't necessarily a sign that there isn't an airlock. It merely indicates that the coolant temperature at the gauge sensor is normal. And don't forget that the primary temperature controlling device is the engine coolant thermostat, not the fan thermostat.
What we need here for a start is advice from someone who is familiar with the filling/bleeding technique for this model of car.
I think that concentrating on the fan thermostat is the wrong approach until everything else has been shown to be in order. A fan is only needed to cool the radiator when there is insufficient airflow through the radiator by virtue of movement of the car. 70 miles of normal driving shouldn't result in the car overheating, especially at this time of the year.
It sounds to me like there is insufficient coolant flow through the radiator, and this could be the result of an airlock, a partially blocked radiator, or the coolant pump not working properly.
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Is it overheating all the time or just in traffic? Does it boil or are you relying on the temperature gauge? Does the heater work OK?
i didnt know it was overheating untill the garage said they couldnt do the mot because its too warm its overheating,
yes the heater works fine when the temp gauge reaches middle hot air blows out the fans
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ill let it run till the temp gauge reaches midway tomorow and then ill check the heat on the radiator
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hey let it run till warm, temp gauge was halfway up, the radiator got a little warm but i could put my hand on it for ages i dont think it was too hot to touch
could it be a water pump failure?
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It doesn't sound to me as though this car is overheating, the only way you can tell, other than it boiling is by the temperature gauge, and you say this is reading normal. The fact that it feels hot means nothing - unless there is smoke coming off the engine. It normally runs at just below boiling point - it will feel hot!
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could be
but you also said after the event the car was stood for 8 months
why dont people give all the facts rather than get them out bit by bit like in the spanish inqusition
anyway
you should be able to see the water moving in the top up bottle with engine running and so disproving a faulty pump
more than likely a stuck thermostat now most bits of detail are out
did you find it on the end of the hose from the radiator?
your car is hardly a best seller i looked at 1000 pictures of cars last night and not one had the 1500 engine in it they all had the 1341
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sorry bellboy i didnt see what the fact it had been standing has to do with it running hot, im sure it wasnt running hot when it was standing for 8 months.
i looked in the expansion tank when the engine was unning and no water appeared to be moving, i also then checked the radiator and again no water seemed to be moving.
theres an image of teh engine bay, you think its the block on the end of the hose by the dipstick?
img151.imageshack.us/img151/6813/13042009094.jpg
is there a way i can test/unstick the thermostat?
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The thermostat will in the housing secured by 2 bolts at the engine end of the top radiator hose.
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Have you had the spark plugs out?
Looking at that photo', it seems the plug caps are odd.
Assuming number 1 to be next to the thermostat housing:
1 and 3 are sticking up higher than 2.
4 is sticking up even higher.
Has it got a misfire?
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ill have a look at them now, no it sounds very smooth thats y i dont know why the garage said its overheating and such,
but is there any way to unstick the thermostat?
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No, if its sticking it will need replacing, they are not usually expensive. However if it was sticking shut the radiator would be cold all the time and the water in the engine would boil within a couple of miles.
A good test of the thermostat is to start the car from cold, keep hold of the top radiator hose, this should suddenly then become warm as the thermostat opens and there is a rush of hot water from the engine !
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hey guys
checked the thermostat today and its loking pretty dull, i placed it in a cup of boiling water and left it and then in a cup of cold water and there was no flicker of life in it, i assume its movements are visible to the naked eye,
im gonna replace the thermostat and let you know how it goes
thanks for all the help
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Yes you should see movement - sounds to me like it's a gonna.
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Thanks mfarrow, will change and keep u all updated :)
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hi guys
changed the thermostat today and the gauge doesnt even move now, let the car run and the heat coming off the exhaust manifold was excessive but the dial just remained on the C,
could i of installed it wrong?
or could this just back up my thoery of water pump gone?
the hoses are quite flacid when the engine is running and if the hot water isnt being pumped around wouldnt this mean the car would overheat and the gauge would remian cold?
thanks
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well that sorts your problem
hope you exchanged insurance details :-)
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lol no i assume you know s bumped the post to get it to the top of the list in the forum, still with the problem
anyone else think its the water pump?
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Have you tested the new stat to make sure it's not a duffer? Put it in upside down perhaps?
When the engine does heat up, does the radiator top hose feel warm? Any bleed points you've forgot to, err, bleed?
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yea i tried testing the new stat but there was very little life in it too, is this a common thing where new stats are broken?
i inserted it in the hole the same way the old one came out.
no the hoses dont feel warm when the engine is warm, i dont think there is a bleed point on the car.
yesterday i ran the car and took the top hose off the radiator and nothing came out of the stat or the hose, i left the engine running 10 minutes and neither the heat dial raised or water came out of the stat/hose
thanks
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In a pan of boiling water, dangling by a piece of string on a pencil over a stove, the stat should start to open as the water gets to boiling point.
You say the temp gauge never moves - does it not move at all or does it get so far when you turn the ignition on and then just stop there? It might be worth replacing this just in case you're not getting a correct reading.
Don't forget also that it will take longer for the stat to open the first time after you've drained the system.
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