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No power to climate control (sporadic) 850 1994

posted by  artdrectr on  Mon Dec 22 17:55 CST 2008
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last visit: Thu Aug 28 22:51 CST 2014
[RELATED]

My ECC sometimes works, sometimes doesn't. (Not working means: no fan, no LEDs, no warm air!). I get no flashing LED code when it is working.

Will the ECC stop working like this when any of the interior sensor fans seize up or other trouble? Or, might it be a relay going bad?

Any clues?








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    No power to climate control (sporadic) 850 1994

    posted by  KlausC on  Tue Dec 23 07:40 CST 2008
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    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    When you start your car, do the AC and recirc lights flash about 20 times? Have you checked for any codes in box B-1?

    The normal fault would be the small fans behind the front grab handles getting caught by dust bunnies.

    Klaus
    --
    Volvoless. Sold the R. There is now a void...








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      No power to climate control (sporadic) 850 1994

      posted by  artdrectr on  Tue Dec 23 19:51 CST 2008
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      last visit: Thu Aug 28 22:51 CST 2014
      [RELATED]

      The ECC does Not flash it's LEDs, at any time. Weird?

      I can't pull a code, because when I insert the fly wire into B-1 the LED is lit solid. Makes me think there is presently a short in that system. But even as that is happening (the ignition switched to On, of course), the ECC can still operate (fan, heat, LEDs). It just stops occasionally while driving and then the next time I start it, it may or may not be working.

      My feeling is that the heater fan resistor is headed on the way out, but can't confirm.








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        No power to climate control (sporadic) 850 1994

        posted by  KlausC on  Wed Dec 24 05:06 CST 2008
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        last visit: Fri Oct 24 10:15 CST 2014
        [RELATED]

        The next time the fan turns off while driving, turn the fan speed to max. If that works then you want to verify that the fuse is in good condition. If you have installed a cabin filter, verify that it is reasonably clean. If not, make sure nothing is in the intake area that is obstructing the fan - twigs, leaves, etc.

        Make sure the car doors are closed when checking any codes and turn the blower speed to zero when checking B-1.

        Klaus
        --
        Volvoless. Sold the R. There is now a void...







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