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Thread: Auxiliary cooling pump - relay test

  
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    Planty's Avatar
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    Auxiliary cooling pump - relay test

    When the key is in on no.2 the cooling pump is on, WHY?
    is this a knacked relay or a thermostat,
    even when the engine is cold or hasn't been used for a few days.

    It's a zafira A gsi,
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    Could be a knackered relay or coolant control module. tricky systems to diagnose IMO, I had no end of trouble with mine a couple of years ago.
    Even the damp/wet weather we have been having may be affecting the CCM, may be worth having a bash and removing it and drying it out in your airing cupboard.

    See if you get continuity between 33 and 85 on the relay, (IIRC), if you do, the relay is duff.

    do the pedal test to see what fault codes are coming up.

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    i have a opcom thing for my laptop and no codes, just seem strange that it can be on all the time.

    whats a ccm??
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    Coolant control module.

    May still be worth doing the pedal test, its picked out codes in the past that my code reader fails to register.

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    Mark T's Avatar
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    is No.2 the one for the heater matrix?

    If so that should run all the time the ignition is on.
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