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Thread: Electric fan on from start up

  1. 31st August 2014, 09:29 AM #11
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    fourteen8
    fourteen8 is offline Master Supporter
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    Quote Originally Posted by SiddersC View Post
    Normally due to an overheat situation, the ECU permanently turns on the fan. Can also be due to the coolant temp sensor being temporarily disconnected or a wiring short, clearing the fault with a Nanocom will reset it. That is unless the wiring has been butchered.
    In my case I had the a false engine overheat warning light on when it was first started the engine after a new altrnator was put in.

    Could it the fault code still there. Can I reset it without nanocom?
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  2. 31st August 2014, 02:08 PM #12
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    alien
    alien is offline A Keeper of the TGO Silver Subscriber
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    I've had this happen to my TD5 and one other.
    In both cases the motors had got hot and the fan was staying on as a protection thing.
    Hooked the Nanocom up and cleared the ECU faults and all was back to normal.
    Cheers, Kyle



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  3. 31st August 2014, 03:17 PM #13
    Joseph
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    Red face

    Thanks for all the alternatives. My external temp gauge on the AC is reporting outside temp ok. Have mate with Nanacom coming next week will check it out then. Cheers
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  4. 31st August 2014, 07:39 PM #14
    DiscoKym
    DiscoKym is offline Master
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    I had the same problem after the workshop replaced the head gasket.

    Looking here said to check for error codes.

    Yep they must have started it with there inlet manifold sensor disconnected.

    I checked it was connected now, reset codes and fan now behaves as advertised...

    Cheap fix...
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  5. 1st September 2014, 07:54 PM #15
    BIG O
    BIG O is offline Master
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    Had this on our 99 Td5. Took it to MR Auto..A replacement MAF was the solution !!
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