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Thread: Twin condenser fans running constantly when ignition on

  1. 15th June 2007, 01:26 PM #1
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    njz
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    Twin condenser fans running constantly when ignition on

    The 2 condenser fans (in front of the radiator) on my V8 D1 are running constantly when the ignition is on (A/C off). I noticed the fans running constantly while driving on the Crooked River track after doing 30+ river crossings on a trip over the long weekend at Eaglevale. I disconnected the coolant temp sensor that is supposed to switch the fans on when the coolant temp is high and the fans turned off. I cleaned up the connector and the fans still run when its plugged in even when reversed. Also the fans switch on normaly with the A/C when the temp sensor is unplugged too. And the fans don't run unless the ignition is on.

    Any ideas what the problem is? Faulty sensor?
    97 D1 V8 SE manual - loud & locked - RPI Optimax & some toys
    09 D3 HSE
    Sold and missed: 03 D2a V8 auto

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  2. 15th June 2007, 02:15 PM #2
    waynep
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    Do you have a multimeter ?? Turn it to ohms and you can test the sensor.

    ... someone with RAVE CD will advise what the resistance readings sholud be for normal and high temps ( hopefully )
    Last edited by waynep; 15th June 2007 at 02:20 PM.
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  3. 15th June 2007, 02:36 PM #3
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    BigJon
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    Faulty (sticking) fan relay?
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  4. 15th June 2007, 02:46 PM #4
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    ladas
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    If it was a sticking relay it wouldn't run normally when disconnected from the sensor.

    Just put a meter on the sensor (resistance) when the engine is cold - it should be open circuit................if not.................

    My guess the sensor has failed..........and it acts as a built in safety device - make on fail - so in the case of failure you are still protecting the engine by running the fans whatever the circustances (hot cold)
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  5. 15th June 2007, 03:10 PM #5
    Rovernaut Guest
    In case you wern't aware ,there are 2 coolant sensors, one for the ECU for engine management and one for the condensor fans. I think from memory the condensor one is the big one on the thermostat housing.
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