doncs
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Registered: 8th Jul 08
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hey guys, my fans arnt coming on which is causing the water to boil up and bubble, which is then causing it to produce steam which comes out from under the bonnet. how do i get my fans working?
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Colin
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Registered: 4th Apr 02
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It will be the switch at the bottom of the radiator.
Either replace the switch or you could bridge the fan circuit so its running all the time.
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av it
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Registered: 4th Mar 08
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quote:
Originally posted by Colin
It will be the switch at the bottom of the radiator.
Either replace the switch or you could bridge the fan circuit so its running all the time.
second that
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doncs
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Registered: 8th Jul 08
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whats best to do, replace the switch, or kep it running all the time?
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Colin
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Registered: 4th Apr 02
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Replaceing the switch will take longer & cost a coupe quid & is more a long term solution.
Creating a closed circuit across the fan is more a get you home solution. The fan will stay on as long as the ignition is running & your water wont boil.
If you've lost coolant mind & top back up with antifreeze or you could get fucked over when the winter arrives.
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Charlotte
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Registered: 30th Jun 08
Location: Swanley, Kent
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my fans werent working on my old car so i checked and the switch just werent in properly, could be that?
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doncs
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Registered: 8th Jul 08
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ill have a look...reason im asking is that my water is boiling up...could this be due to to little coolant? would the water boil up if the fans wernt working?
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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head gasket is a possibility.
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doncs
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Registered: 8th Jul 08
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theres no 'mayo' coming from the oil cap or nothing tho. dont think its a head gasges as ive been driving and the temperature dosent rise that high tbh
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Colin
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Registered: 4th Apr 02
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Turn the car on & watch to see if the fans come on. No coolent shouldnt be a problem just now, its not like its 100oC outside  
Id go wih the fan switch chucked a wobbly. You could even stick a Voltmeter over the terminals & see if theres any reading from it, it should come on at a certain temperature when the Bi-metallic switch trips.
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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so the temperature doesnt 'raise that high' but the coolant is boiling and bubbling and steam is pouring from under the bonnet???
[Edited on 16-07-2008 by Dave A]
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doncs
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Registered: 8th Jul 08
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should the fan come on straight away when i start the car?
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Colin
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Registered: 4th Apr 02
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Oh possibly your header tank cap isnt holding pressure!! That would make it boil....much like a kettle does. Cooling system works under pressure!!
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doncs
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Registered: 8th Jul 08
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could the problem be air lock? maby if i bled the coolant system and refilled it?
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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is it using coolant? how long does it take from starting the car to the point the boiling starts?
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doncs
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Registered: 8th Jul 08
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dont think theres coolant in it tbh...just plain water. could this be the problem? usually a good 15 miles before it starts
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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does it do this when sitting in traffic or when you are driving?
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doncs
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Registered: 8th Jul 08
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well i went for a drive the other day, then pulled over to notice steam coming out as soon as i pulled over...so prob when i was driving also. then i opened the bonnet and the water was bubling
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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sounds very much like head gasket failure. the bubbling is caused by exhaust/combustion gasses leaking from the cylinders to the cooling system.
any white smoke from the exhaust at all?
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doncs
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Registered: 8th Jul 08
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nope no smoke or nothing
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Dave A
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Location: County Durham
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get a compression test done.
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doncs
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Registered: 8th Jul 08
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if the fans arnt working, would this cause the water to boil? aswell as having no coolant in the system?
[Edited on 16-07-2008 by doncs]
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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water under pressure wont boil until around 115 degrees+ the fans would come on at around 97 degrees.
but you are saying that the temperature on the dash doesnt get too hot then the coolant isnt boiling as such, the bubbling could be caused by combustion gasses in the coolant system.
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Ellis
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Registered: 11th Sep 07
Location: Aberdeenshire
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quote:
Originally posted by Dave A
water under pressure wont boil until around 115 degrees+ the fans would come on at around 97 degrees.
What pressure does the cooling system operate at?
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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depends on the ambinet temperature, coolant temperature, engine rpm's and many other factors.
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