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Thermo fan on freeway.

Discussion in 'VR - VS Holden Commodore (1993 - 1997)' started by aidanp96, Mar 3, 2015.

  1. aidanp96

    aidanp96 New Member

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    Hey all.

    Just want to get peoples opinion.

    My VR going 80-100km/h even on a cool night the thermo fan is running when traveling at said 80-100km/h. Even after stopping it take around two minutes for the fan to then turn off. I went and checked the temperature of the air coming through the radiator with my hand it it didn't seem too hot at all. The temp guage (which i recently changed the sender) says its (two lines above mid at most). I've recently changed the radiator, coolant, new radiator cap and it was bled. Everything seems to be in order. My guess is that it could be the thermo fan switch sensor that may be faulty and causing the fan to run when it doesn't need too.

    Any ideas? Or is my car running perfectly normal and there isn't any issue.

    Thanks in advance.
     
  2. mpower

    mpower Well-Known Member

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    I've got a couple of LS1's - the secondary fan runs all the time with the a/c on.

    Don't know if that'd be relevant to you?
     
  3. B-Man

    B-Man Member

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    delete me........ .......... ..........
     
    Last edited: Mar 3, 2015
  4. B-Man

    B-Man Member

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    both thermo fans run when my aircon is on even if engine is cold. (VYII LS1) not sure what they do when driving as i cant hear them running
     
  5. Nut Kracker

    Nut Kracker Donating Member

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    Op didn't say if he had the A/C on or not.
    Check that the plug connecting to the coolant temperature sensor is connected correctly.
    As far as I can recall..... If the plug isn't connected, or the sensor is faulty, the fans automatically come on.
    This is a safety feature, built in to the ECU. Because if the ECU doesn't properly know the temperature of the engine,
    it will automatically turn the fans on.
     
  6. aidanp96

    aidanp96 New Member

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    Thanks for the advice Nut Kracker + others. The A/C isn't on. I would call myself intermediate with my car knowledge and know both fans turn on with A/C.

    Would the best thing to do is to just replace the sensor anyway? I have no idea how old it is and knowing how to last owner treated the car it could be from factory XD
     
  7. Nut Kracker

    Nut Kracker Donating Member

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    Check and clean the connection at the sensor first and see how you go.
    No need to go pulling stuff out, when it can be a simple fix.
    There may even be a build up of gunk or corrosion on the plug contacts, inhibiting contact between the sensor and the plug.
    It may not be what I said at all, but definitely worth a shot.

    If that fails, go ahead and replace the sensor. They're not that expensive.

    Edit; Hang on a sec.
    I'm not entirely sure, but haven't the VR engines got 2 coolant sensors?
    One for the gauge and one for the ECU?

    Maybe someone else here can clarify this?
     
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  8. aidanp96

    aidanp96 New Member

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    Yes VR has two. One for guage and other for everything else. I replaced the gauge one recently. The other one is god knows how old.
     
  9. Nut Kracker

    Nut Kracker Donating Member

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    Could be why the temperature gauge is working.
    The other one could have a bad connection or faulty and that's why the fans are coming on.
     
  10. jgtoranalc

    jgtoranalc Member

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    +1.... also check if the wiring connector is actually connected properly. I did my Inlet manifold gaskets and when I reassembled everything, I didn't click it in properly.
     
  11. aidanp96

    aidanp96 New Member

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    I know about having it plugged in, ill check that tomorrow. What is interesting is that it isnt on until it warms up but then it seems to be on excessively afterwards.
     

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