505 heater fan
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Thread: 505 heater fan

  1. #1
    1000+ Posts catshamlet's Avatar
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    Default 505 heater fan

    I don't like the idea of my fan blowing whenever the key is turned to 'accessory'(?) but did I read somewhere that it isn't a good idea to simply fit a switch into one of the wires?



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    Mike.
    Started out with nothing, still got most of it left.

  2. #2
    1000+ Posts Gamma's Avatar
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    No, not a good idea to fit a switch.
    The excellent door seals and the general air tightness of the 505 can mean almost certain suffocation without a supply of fresh air.

    The fan can get noisy after some years of service, but this is fixable easily and cheaply.
    (it will be in the archives or you can PM me for information).
    /// 1986 SII 505 GTI
    2003 T5 307 HDI
    2013 LandRover90
    Sacred cows make the best hamburger mince.
    If you run, you only die tired

  3. #3
    1000+ Posts robmac's Avatar
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    But... in the Mad Poms 203 it's probably a very good idea.

    Go for Mike, just find the wire to the heater fan that has 12v+ ignition switched on it and put a switch in series with it.

  4. #4
    1000+ Posts catshamlet's Avatar
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    Thanks. I should've explained that mine's not so easy to get to.

    So do you mean fit the switch into the wire between the thingy* on the aluminium plate under the bonnet and the fan, Rob? (The red one in the pic?).



    Mike.

    *I just know that thing has a name, but can I think of it? Err.....
    Attached Thumbnails Attached Thumbnails 505 heater fan-mikes-carpics-2-010.jpg  
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  5. #5
    1000+ Posts robmac's Avatar
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    Quote Originally Posted by catshamlet View Post
    Thanks. I should've explained that mine's not so easy to get to.

    So do you mean fit the switch into the wire between the thingy* on the aluminium plate under the bonnet and the fan, Rob? (The red one in the pic?).



    Mike.

    *I just know that thing has a name, but can I think of it? Err.....
    Hi Mike,

    Do you mean power transistor on the aluminium heat sink ?

    I would be trying to find where the power comes from and intercept that wire. If you can tell me the model of donor car I could check on my circuit diagram.

    If you have a circuit diagram your self, post the heater fan/s section and I'll give it my best shot.

    I hope we are not talking two separate fans?

    The other way to find the wire feeding it is disconnect wires until the "acc on" fan running stops but on/off control with fan dash switch doesn't.

    cheers

    Rob

  6. #6
    1000+ Posts catshamlet's Avatar
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    That'll be the thing, as the pic. To stop the fan running while I've had the key turned, I've had the wire disconnected.
    That was for when I was working on the windows etc,, the key was turned on sometimes all day and the fan just seemed an unnecessary drain on the battery. The donor is an '87 GTi. No aircon, just the one fan.
    Talking of battery drain, with the positive side of the battery connected and the negative side disconnected - when I put one lead of my multimeter on the positive battery terminal and the other lead to a good earth on the body I get a reading of 0.2 volts. Surely that shouldn't happen?



    Mike.
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