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Ford Festia 1.4 2009 - Radiator fan is not switching on

Karl Johnston
Karl Johnston
in Ford Fiesta Club

Featured Replies

Hi Guys. 
 

ford Festia 1.4 2009 petrol. 
 

Got an issue with the radiator fan. It seems it doesn’t want to switch on when it gets to optimal temperature around 92-95 degrees. Only comes on when I turn the A/C on. When I turn A/C off it will eventually go off after 20 seconds. 

I’ve changed the temperature sensor. I’ve changed the big grey relay for the fan. Nothing seemed to make it want to come on when it has to. I’ve heard an earth maybe could be an issue but not sure. Frustrating one for sure. Really testing me at the moment haha. 
 

Any ideas? 
 

Karl. 

  • Quote


    Is there a resistor on the bottom corner of the fan cowling?  If the resistor fails, the fan can only run at full speed, so won't cut in until the temp reaches around 98c or you switch the AC on.

    Some of these only used a single speed fan.  And some used a complex 'module' for multispeed fans rather than a basic resistor.  It'll be easiest for you just too look at yours instead of us trying to work out which you have.

  • Quote
    • Like 1
    • Author

    Not sure if it has a resistor at the bottom of the fan. I think it is a multi speed fan however.
     

    It’s just a funny one. The fan will come on at 106 C but I assume that’s too hot? So am thinking if I just hard wire the fan to always be on when I turn ignition on at this rate of going. 

  • Quote
    1 hour ago, Karl Johnston said:

    So am thinking if I just hard wire the fan to always be on when I turn ignition on at this rate of going. 

    Or could just leave the AC on like it is meant to be, and by default the fan will run. 

  • Quote
    2 hours ago, Karl Johnston said:

    Not sure if it has a resistor at the bottom of the fan. I think it is a multi speed fan however.
     

    It’s just a funny one. The fan will come on at 106 C but I assume that’s too hot? So am thinking if I just hard wire the fan to always be on when I turn ignition on at this rate of going. 

    106c might be about right for high speed fan on this engine.  Sounds like it is the resistor that's failed.

  • Quote
    • Like 1
    • Author

    I think I’ve came to a solution folks. The car basically overheated a month  ago. I changed the head gasket and a mechanic has said if there’s even a hairline crack in the expansion tank it will send mix singles to the radiator fan. Also putting in some T sealant to fix any leakage that am sort of getting around the water plugs at the top of head under the rocker cover.   

  • Quote
    • Like 1

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