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Thread: Disco 3 viscous fan problem

  1. 28th December 2022, 10:04 PM #11
    BradC
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    Quote Originally Posted by DiscoJeffster View Post
    This doesn’t make sense to me as the manual makes the statement that if the fan is unplugged the vehicle will overheat and error will be logged, which to me says the fan is in a “looser” state without power applied.
    To quote “if the electrical connections to the viscous fan are disconnected, the fan will idle, and the engine may overheat”
    You're probably right. I was going by memory from when I played with it a few years ago. Next time I'm in there I'll have another look.

    In that case either the fan solenoid is jammed, control wire shorted to ground or the ECU is faulty. If that is true, unplugging the fan will rule out the last 2 and it should idle.
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  2. 29th December 2022, 09:58 AM #12
    Sunny coast Chris
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    Quote Originally Posted by BradC View Post
    You're probably right. I was going by memory from when I played with it a few years ago. Next time I'm in there I'll have another look.

    In that case either the fan solenoid is jammed, control wire shorted to ground or the ECU is faulty. If that is true, unplugging the fan will rule out the last 2 and it should idle.
    Ok Guys!
    If that's correct, as you say unplugging the fan should slow it down, at least when the engine and fan is cold, i will double check but i think its doing the opposite.
    Whats the procedure for testing the alternator? and is it possible to test the fan solenoid?
    Both my batteries are staying charged but i did notice this morning sometimes the battery light only goes out when I'm driving and the revs go up above 2200RPM
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  3. 29th December 2022, 12:42 PM #13
    Sunny coast Chris
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    OK!
    So I've checked and it looks like my alternator is stuffed, i'm only getting 13V max when the engine is running and it should go up to 15V, is that correct?
    I found a random youtube video from someone on testing and replacing their alternator on the same year and model as mine, in one of his comments he points out that one of the symptoms is the fan running constantly!
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  4. 2nd January 2023, 05:28 PM #14
    Sunny coast Chris
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    Problem solved

    So an update, it turned out to be a faulty alternator.
    Fitted a new one yesterday and it’s back to its normal quiet capable self.
    Thanks guys for the input, so if anyone else has the cooling fan running constantly check your alternator output!
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