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Radiator/cooling Fan Constantly On


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#1 wijcc

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Posted 16 February 2010 - 01:35 PM

I had this problem before.. where the radiator fan constantly goes on/gives turning even after i switch off the car, draining my car battery. I resolved this problem about 2.5 months ago by fitting a new thermostat. However the problem has now returned again. So i am reduced now to disconnecting my car battery after i switch the car engine off.
Can anyone point me in the right direction as to what may be causing the fan to be constantly on??? Do I need to fit another new thermostat on?
Thanks in advance guys :)

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#2 artscot79

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Posted 16 February 2010 - 02:14 PM

I had this problem before.. where the radiator fan constantly goes on/gives turning even after i switch off the car, draining my car battery. I resolved this problem about 2.5 months ago by fitting a new thermostat. However the problem has now returned again. So i am reduced now to disconnecting my car battery after i switch the car engine off.
Can anyone point me in the right direction as to what may be causing the fan to be constantly on??? Do I need to fit another new thermostat on?
Thanks in advance guys Posted Image



it wont be the thermostat it will be the thermo switch on the radiator that needs replaced if it was the thermostat then you have some issues ide take it into ford and have it looked at and im sure it will be this switch

#3 wijcc

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Posted 16 February 2010 - 02:37 PM

it wont be the thermostat it will be the thermo switch on the radiator that needs replaced if it was the thermostat then you have some issues ide take it into ford and have it looked at and im sure it will be this switch


Thanks.. where on the radiator is the thermo switch.. and how can i test it please?

#4 artscot79

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Posted 16 February 2010 - 04:02 PM

Thanks.. where on the radiator is the thermo switch.. and how can i test it please?



its usually located on the edge of the radiator on the passenger side ive done escorts and thats where its found testing it is pretty pointless as this is what switches the fan on and off at a predetermined temperature when it goes the fan either stays on or doesnt comne on at all it will mean draining some coolant out though one thing though if you have aircon or climate control the fan will run all the time if you do have it switch it off and check

#5 wijcc

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Posted 16 February 2010 - 04:37 PM

its usually located on the edge of the radiator on the passenger side ive done escorts and thats where its found testing it is pretty pointless as this is what switches the fan on and off at a predetermined temperature when it goes the fan either stays on or doesnt comne on at all it will mean draining some coolant out though one thing though if you have aircon or climate control the fan will run all the time if you do have it switch it off and check


thanks i have the air con switched off. Are you referring to the radiator fan resistor assembly which is secured to the top of the fan shroud?

#6 CAR PARTS EXPRESS

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Posted 16 February 2010 - 04:40 PM

no he means a round brass switch which screws into the radiator BUT I'm not 100% sure that model has one in the rad...if you cant find one it will be controlled via the ect located in the water housing bolted onto the head

#7 wijcc

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Posted 16 February 2010 - 04:45 PM

no he means a round brass switch which screws into the radiator BUT I'm not 100% sure that model has one in the rad...if you cant find one it will be controlled via the ect located in the water housing bolted onto the head


oh.. now i am getting more confused..
From the haynes manual i can find the following
- radiator fan resistor assembly which is secured to the top of the fan shroud
- cyclinder head temperature (CHT) sensor.. located on the engine near the spark plugs

From the wiring diagrams, engine bay fusebox fuses
F6 engine cooling (air con)
F29 engine cooling fan (air con)
F65 engine cooling fan

Also the thermostat (which i changed 2.5-3 months ago..).
It also stated that a engine management fault can cuase overcooling...

#8 CAR PARTS EXPRESS

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Posted 16 February 2010 - 04:51 PM

cylinder head sensor....same as ect (engine coolant temp sensor) if there is no sensor in the rad...which I am 99% sure there wont be...thats the one to go for first

#9 wijcc

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Posted 16 February 2010 - 04:53 PM

cylinder head sensor....same as ect (engine coolant temp sensor) if there is no sensor in the rad...which I am 99% sure there wont be...thats the one to go for first


cool thanks :)
I'll give it a try.. strange how though the car stopped doing this after i changed the thermostat but has started doing it again grrrrrrrrr

#10 wijcc

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Posted 16 February 2010 - 05:20 PM

cool thanks :)
I'll give it a try.. strange how though the car stopped doing this after i changed the thermostat but has started doing it again grrrrrrrrr


Back again for more help.. i have been to the eurocarparts website.. to look up the part.. I have put in my car reg number.. and it has listed serveral temperature sensors...


CHT 1

CHT 2

Whats the difference between the two.. I tried calling them and they were not helpful/knowledgeable.. which should i get?
Thanks again guys for all your help :)

#11 artscot79

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Posted 16 February 2010 - 06:12 PM

Back again for more help.. i have been to the eurocarparts website.. to look up the part.. I have put in my car reg number.. and it has listed serveral temperature sensors...


CHT 1

CHT 2

Whats the difference between the two.. I tried calling them and they were not helpful/knowledgeable.. which should i get?
Thanks again guys for all your help Posted Image


the second one by the looks of it thats 1998 onwards the first is 2002 onwards

#12 wijcc

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Posted 16 February 2010 - 06:15 PM

I check the relay/fuse in the fusebox under the bonnet... its a 30A relay/fuse... I took it out then put it back in and gave it a tap with the back of my torch and the fan stopped spinning.. so I guess I should really get myself a new relay/fuse??? is that something you have to buy from a main/ford dealer?

#13 stef123

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Posted 16 February 2010 - 07:45 PM

I check the relay/fuse in the fusebox under the bonnet... its a 30A relay/fuse... I took it out then put it back in and gave it a tap with the back of my torch and the fan stopped spinning.. so I guess I should really get myself a new relay/fuse??? is that something you have to buy from a main/ford dealer?


probably just the relay sticking then. either ford or scrappies id say

#14 artscot79

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Posted 16 February 2010 - 09:14 PM

probably just the relay sticking then. either ford or scrappies id say



whod have thought it after all that and it was a relay never even thought about that myself strange usually the first thing i check this virus is rotting my brain i think

#15 wijcc

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Posted 18 February 2010 - 02:21 PM

whod have thought it after all that and it was a relay never even thought about that myself strange usually the first thing i check this virus is rotting my brain i think


Thanks again guys for all your help.. will head to the local motor factors store on saturday and see if they have one of these relays.. otherwise it is off to the nearest ford dealer.

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