Volks AutosEM Tuning
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  1. #1

    Join Date
    Jul 2007
    100 km out of Canberra, Australia

    Weird intermittent aircon fault


    I'm new to this forum (but a regular on Ozaudi down under).

    I have a 2000 model A4 1.8T which I've owned for around five years. On hot days in our hot Australian summer , the aircon sometimes plays up. Which means of course that sometimes it doesn't, if you're a glass-half-full kind of person.

    On a long run when the temp is over about 30C, the aircon intermittently blows hot air, for a second or so, around two to five times per minute. Although it immediately resumes blowing cold air, it doesn't seem quite as cold any more. On cooler days (when you don't need the aircon as much ) this never happens.

    I read somewhere (I think on the Bentley's website) that this can be caused by the flaps which control the hot air flow opening spontaneously and admitting hot air into the vents. I remember a couple of summers ago putting my hand up behind the dash on the passenger's side (whilst the car was at rest, natch ) and feeling the plastic actuators on the flap valve move backwards and forwards as the vents gave out hot blasts of air.

    The next summer it didn't seem to happen much. I have no idea what's going to happen this year (we are in the middle of spring now).

    Life is full of surprises with an Audi

    All suggestions welcome.


  2. # ADS
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  3. #2
    Staz's Avatar
    is a retronaut

    Join Date
    Oct 2006
    Bristol (mostly)
    I think you're diagnosis is probably spot on mate. There have been a few posts recently about actuator problems. Most of them are confirmed with VCDS error logs. I'm not sure on the remedy though to be honest. Could be a software bug or it could be a sensor problem. Or even the actuator itself having a little brain fart!
    8P2 S3

    For advice on Air Con problems please read my FAQs.
    To find ASN members with VCDS check out the MAP.



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