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Fan Switch

xev
xev
in Ford Focus Club

Featured Replies

Hi,

I noticed last week that my fan turns itself on when I use the heaters. My friend said it was probably the fan switch. So he fitted me A new one but its still happening. Any ideas.

Zev

  • Quote


    hi, im going to assume you mean the fan on the radiator, from other forums i have gathered that this happens on one or more of the following:

    1) faulty thermostat

    2) faulty temperature sensor

    3) faulty fan switch (as you mentioned)

    4) if you have a diesel with additive tank, this can be a result of a car trying to perform a forced regen by itself. this will need dealer attention as the tank will need refilling etc. (dont worry about this if you have petrol)

    doesnt fill you with much confidence, but its a few ideas to start looking at

  • Quote

    hi, im going to assume you mean the fan on the radiator, from other forums i have gathered that this happens on one or more of the following:

    1) faulty thermostat

    2) faulty temperature sensor

    3) faulty fan switch (as you mentioned)

    4) if you have a diesel with additive tank, this can be a result of a car trying to perform a forced regen by itself. this will need dealer attention as the tank will need refilling etc. (dont worry about this if you have petrol)

    doesnt fill you with much confidence, but its a few ideas to start looking at

    or if you have aircon it will also switch on even with the aircon switched off if the vents are set to demist windscreen

  • Quote
    • Author

    i shall try that ariscot9 bacause it was set to demist windscreen. Thanks

    fingers crossed

    zev

  • Quote

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    The "Digestive"

    • The Digestive Forum Roundup (24th May - 31st May 2026)

      Steve ·
      The Digestive Forum Roundup (24th May - 31st May 2026) We hope this email finds you well and enjoying your week. As always, our forum has been buzzing with activity, so we’ve compiled the highlights for you. Plenty of interesting discussions are taking place, especially around the Ford Focus and Fiesta models. Starting off with the Focus, many members have been discussing issues with the Emergency Call System, particularly in the Mk4 model. PLB raised concerns about persistent malfunctions, a se
      Steve
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