S70 ECC/fan trouble.....

Discussion in 'Volvo S70' started by thijs, Oct 26, 2004.

  1. thijs

    thijs Guest

    Hi there,

    S70 TD '99 with ECC. After starting the engine, the AC seems to start and
    the blower/fan (what do you call that in English??) starts up for 2 seconds
    (may be a bit less powerful than usual) than the fan quits and my
    ECC-switches show green/orange lights: failure. Fan won't function anymore.
    I DO get some hot or cold air (depending on the temp. setting) but without
    the fan it aint much of course. Appparently the AC itself is fine. Dealer
    checked it (read out the computer) and says: the blower/heating engine fails
    and has to be replaced.

    Possibly true, but the strange part is that it DOES start up for a couple of
    seconds. Is it possible that something got stuck in the engine, so that it
    almost blocks, sucks up too much power and the computer decides to shut the
    whole operation down? Any other experiences with this?

    Any suggestions appreciated. Thanks in advance,

    Thijs
    Holland
     
    thijs, Oct 26, 2004
    #1
  2. thijs

    OBD Guest

    It is likely the cabin temperature sensor is full of dirt
    This is causing fault code ECC-414, this code is wrongly labelled on the
    Volvo scan tool which describes a problem with the main blower.

    Look to the left of the ECC control box you should see a small grill next to
    the heated rear screen switch.

    Get a light and look inside, you will find it is full of dirt. There is a
    small fan in there to draw air over the sensor wire, this cannot turn
    because of the dirt and is causing the problem. The small fan only turns
    when the main fan does.
    Use a vacuum cleaner to clean out the dirt or remove the sensor and clean
    it. Do not poke things in there to clean it or you will break the sensor
    wire.
     
    OBD, Oct 26, 2004
    #2
  3. thijs

    Mike F Guest

    When the system starts, it self checks. If the motor is drawing too
    much current for the voltage applied to it, then the control unit
    assumes the motor is going bad and shuts it down to save the fan
    controller. Chances are you have a bad heater motor, but it could be
    the controller as well.

    --
    Mike F.
    Thornhill (near Toronto), Ont.

    Replace tt with t (twice!) and remove parentheses to email me directly.
    (But I check the newsgroup more often than this email address.)
     
    Mike F, Oct 27, 2004
    #3
  4. thijs

    thijs Guest

    That sounded great!!! Tried it straight away....it WAS dirty....but cleaning
    it didn't change anything....unfortunately.....thanks anyway - this is the
    type of know how I'm looking for!
     
    thijs, Oct 27, 2004
    #4
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