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Discussion in 'A3/S3/Sportback (8P Chassis)' started by Brodster, Jun 20, 2013.

  1. Brodster
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    Brodster Shark Performance In Scotland Regional Rep Site Sponsor VCDS Map User

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    [Jun 20, 2013]
    If they are coming on when the car is cold then no they shouldn't as they are controlled by temp sensor. If you've been driving then I would say yes they will be on..............due to the heat of the engine.
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  3. Chillout
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    Chillout Active Member

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    [Jun 20, 2013]
    Is your coolant level ok i would advise you to get your car scanned if even just for peace of mind as you may have a dodgy temp sensor .
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  4. OVRA3
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    OVRA3 Well-Known Member

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    [Jun 20, 2013]
    My fans come on immediately when I take econ off.. It's normal we'll I assume its normal I have no fault codes!
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  5. Chillout
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    Chillout Active Member

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    [Jun 20, 2013]
    When econ is switched off that enables your a/c dependant on cabin temp and set point if the a/c is cycling to maintain your set point the fans will run however if you we're to put your heating up to full I would expect the fans to stop.
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  6. OVRA3
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    OVRA3 Well-Known Member

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    [Jun 20, 2013]
    I don't think I've ever put the heating past 20 it's too hot lol! But yeah I'm sure they would as I said no fault codes so all must be well
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  7. fangio
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    fangio Well-Known Member

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    [Jun 20, 2013]
    I think I read that one fan cools the compressor when the air-con's on.
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  8. fangio
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    fangio Well-Known Member

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    [Jun 20, 2013]
    Who uses air-con constantly in Britain?:think:
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  9. Jack_tdi
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    Jack_tdi Member

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    [Jun 21, 2013]
    Stop worrying lol

    If there's no fault codes and the fans are running I wouldn't be too bothered...... Better than them not coming on
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  10. fangio
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    fangio Well-Known Member

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    [Jun 21, 2013]
    Oops! Missed that!:readit:
    #9
  11. Geraldy212
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    Geraldy212 Sportback owner

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    [Jun 21, 2013]
    Stan, there is no logic in the fans coming on when the engine is cold, and the climate control is switched off. I suspect that one of your temperature sensors is not working to spec, and the engine thinks it's too hot. Get a VCDS scan as soon as possible and see what that indicates. Good luck.
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  12. Chillout
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    Chillout Active Member

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    [Jun 21, 2013]
    econ disables the a/c compressor as in economy less fuel used to run and will only use ambient air to cool the cabin
    while not on econ should your cabin require cooling it will use the a/c by running a/c your radiator fans will run to condense the discharge gas-to a liquid .
    #11
  13. Geraldy212
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    Geraldy212 Sportback owner

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    [Jun 21, 2013]
    Stan, when you first start the car, with econ = on, there should be no reason for the fans to start. If at any time you switch econ = off, then, depending on temperatures, the aircon (climate control) compressor will be active, and the fans may well start.
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  14. Geraldy212
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    Geraldy212 Sportback owner

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    [Jun 21, 2013]
    Stan, with my A3, when econ= on, the fans are indeed off (when engine is cold)
    With econ = off, and 'Auto' =on, the fans will run fast or slow depending on the temperatures measured by
    the temperature sensors, and/or the cabin temperature settings. If the in-car temperature is high (on a hot day) and
    the temperature settings are around 20 deg C, the fans will run fast as one would expect. Hope this helps.
    #13
  15. OVRA3
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    OVRA3 Well-Known Member

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    [Jun 21, 2013]
    This thread is hilarious... Its normal mate you are being paranoid! :scared2:
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  16. Jay.Ing
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    Jay.Ing Active Member

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    [Jun 21, 2013]
    It has been stated above by chill out, for those who dont know your air con has 2 heater matrixes one within the cabin (evaporator) to soak up the warm air (giving an illusion of cold air coming out of your vents), and one behind your radiator to discharge the hot air (Condensor). So when your air con is on (Econ not selected) and your not moving the matrix behind your radiator still needs to dissipate the heat it is dragging out of your cabin, so the fans will run, creating the airflow.

    Hope this helps!
    #15
  17. fangio
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    fangio Well-Known Member

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