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Thread: remote cooling fan switch

  1. #1
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    remote cooling fan switch

    I am possibly driving my new F40 for several hours in 100 degree heat. Am considering a direct wired, switched, on all the time wiring circuit for the front cooling fan. does disconnecting it from the existing circuits affect the normal other operation of the motor or car? (86 2.8 V6)Thanks

  2. #2
    Moderator FunnyWheels's Avatar
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    Re: remote cooling fan switch

    No, you can tie into the fan circuit before the relay and you should be fine. There is a temp switch somewhere in your system that will tell the relay to turn on. One side is usually a wire to the relay, the other side is usually to ground through the sensor where it is screwed into the engine or on the radiator (most are on the engine). When the temp gets up, it trips the switch and completes the circuit to ground making the relay turn on the fan. When it cools the sensor ground opens and the ground to the realay is released through this sensor opening the relay and killing power to the fan motor. All you will be doing is manually telling the fan to turn on. When your switch is in the off position the system should function as initially designed. I am using this set up in my car and it seems to work just fine.

    Hope that helps,

    Dave
    If you're not confused, you're not paying attention.

  3. #3
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    Re: remote cooling fan switch

    Thankyou Dave; just a stupid folowup question? Your suggestion would be to leave all the original wiring and sensors connected, and just tap into the system in front of the relay? Thanks, Steve

  4. #4
    Moderator FunnyWheels's Avatar
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    Re: remote cooling fan switch

    Quote Originally Posted by stevep914
    Thankyou Dave; just a stupid folowup question? Your suggestion would be to leave all the original wiring and sensors connected, and just tap into the system in front of the relay? Thanks, Steve
    Steve: I left mine in place and tapped into them. I only need the extra fan when in heavy traffic, otherwise it operates normally.

    Dave
    If you're not confused, you're not paying attention.

  5. #5
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    Re: remote cooling fan switch

    Here's a do-it-yourself write up I posted at Pennock's:

    http://www.fiero.nl/forum/Forum2/HTML/084323.html

  6. #6
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    Re: remote cooling fan switch

    Thanks to both of you! I'm sure I can sort this out for the trip. Steve

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