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A/C is either cold or too hot

Discussion in 'Air Conditioning' started by fourcircle, Nov 7, 2008.

  1. fourcircle
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    fourcircle nj

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    [Nov 7, 2008]
    Evening. I've just bought a 51 plate A4 avant sport 3.0 V6 quattro and the A/C is playing silly buggrs. If I put it down to Low it blows cool but as soon as I put it up a notch to 18 degrees it blows warm and continues to blow warm, as if there aren't thermostats picking up the right temperature in the cabin or something. I have the same issue on both sides independently. It's really annoying me because if I need to defog the window i'm stuck on cold or roasting hot.
    Any advice very much appreciated

    cheers
    nj
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  3. Rev-head
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    Rev-head Active Member

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    [Nov 7, 2008]
    Ah ! What you doing here:hi:....I would wear less clothes in the car and have it roasting:racer:
    #2
  4. Staz
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    Staz is a retronaut Staff Member Moderator VCDS Map User

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    [Nov 7, 2008]
    Hmmmmm, not a scooby!

    Sorry
    #3
  5. fourcircle
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    fourcircle nj

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    [Nov 8, 2008]
    Steve - thanks mate, knew I could rely on you for a sensible suggestion :laugh:

    Leon - No worries mate. Do you know where the thermostats are in the cabin? I'm thinking low will always blow cold no matter what but 18 degrees or higher will continue to blow hot until the thermostats reach the right temp. maybe these are somehow reading low (or zero?), causing the problem?

    or... t'is witchcraft and I need a bearded priest to exorcise the beastie!
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  6. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Nov 8, 2008]
    It's a common problem on the B6. I've got the same issue, can only get cold on low, 18 and above always warm/hot no matter what. Our B5 CC works perfectly, never need to touch the temp, just leave it on 20 all the time.
    We just live with it, set it on lo then turn down the fans to 1 or 2 bars.
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  7. fourcircle
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    fourcircle nj

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    [Nov 8, 2008]
    ah nuts. thanks mate. good to know it's not just me being mental but with a toddler in the car I think I'll have to keep digging to try to get it fixed at some point.
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  8. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Nov 8, 2008]
    Let me know if you do, would like to sort it out as well, but really can't be arsed as it kinda works
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  9. fourcircle
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    fourcircle nj

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    [Nov 8, 2008]
    will do mate
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  10. Staz
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    Staz is a retronaut Staff Member Moderator VCDS Map User

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    [Nov 11, 2008]
    I haven't been on for a few days sorry. I don't know where the sensor is mate. I think on mine it's near the windscreen.

    Blowing hot constantly until the right temp is reached is a bit strange. But it all depends on the type of circuit. I really don't know enough about it to help, but please keep us posted, I've learned lots of useful things from this Air Con forum so far.

    Hope it's a cheap fix.
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  11. fourcircle
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    fourcircle nj

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    [Nov 11, 2008]
    i'll investigate and post my findings and maybe a few swearwords then mate. cheers
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  12. benr
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    benr Member

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    [Nov 13, 2008]
    Have you hooked it up to a vag-com? It may give you soem fault codes and probably tell you if a sensor is duff.

    It would also be possible to read the theremostat temp so you can see if thats the problem
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  13. fourcircle
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    fourcircle nj

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    [Nov 13, 2008]
    i'll be giving my vagcom a test in the next couple of days. I always had issues getting it to connect to my s2 and coupes but hopefully it will be simpler with this car.

    when you say it would be possible to read the thermostat temp do you mean this can be done through vagcom? If so there's a whole world I haven't seen with my vagcom shenanigans before

    cheers for the input by the way
    nj
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