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Thread: Aircon just blowing warm air on hot days

  1. #11
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    I've done a dash-out air con retrofit once! I'd never do it again, as it was a real pain!
    10 hours of pain!

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  2. #12
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    Quote Originally Posted by mbedford View Post
    Can I just check with the other B7 (that's 20042008) RS4 owners if their aircon copes well on days over 25 degree's?
    FWIW I never had an issue with mine in 5 years of ownership.

  3. The Following User Says Thank You to Alister For This Useful Post:

    DirkOz (January 10th, 2017)

  4. #13
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    A VCDS check should tell you what's wrong, or at least get you looking in the right place.

    My A6 kept faulting the pressure sensor, which was turning off the compressor. Exhibiting the same symptoms you have. Had it to 3 different Audi dealers and had two new sensors and a software update. Still not fixed.

    In desperation I located the sensor myself (in front of the radiator) and with the engine running and a/c switched on by wiggling the wire I could turn the compressor on and off.

    The only way I could tell the compressor was turning on or off was by placing my hand on the aircon pipe work as I wiggled. Pipe gets cold, compressor running. Pipe gets warm, compressor off

    Turns out it wasn't the pressure sensor but the wiring to it. A previous shoddy repair using bullet connectors which had worked loose, as they all do.

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    DirkOz (January 10th, 2017)

  6. #14

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    Get it regassed that fixed mine

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    DirkOz (January 10th, 2017)

  8. #15
    Join Date
    Apr 2015
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    Melbourne, Victoria, Australia, Australia
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    I have the same issue with my B7 A4 2.0T, getting it checked out in the next few weeks. Dropped it off at my local mechanic (not my usual one) just to get it checked, he said it still had plenty of gas and left it at that.
    Will let you know what the issue is once properly diagnosed.
    Keen to know what your issue is too.
    Automotive & Motorsport Photographer
    2005 Audi B7 A4 S-Line Avant - Quattro - 2.0T - 6-spd Manual
    Underground Performance Stage 1 Tune
    CTS Downpipe - ECS Luft-Technik Intake - Southbend Stage 2 Clutch & Lightened Flywheel
    H&R Springs - B7 RS4 Engine Mounts - B6 S4 Tie Rod Ends

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    DirkOz (January 10th, 2017)

  10. #16
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    Quote Originally Posted by PaulyJ View Post
    Will let you know what the issue is once properly diagnosed.
    Keen to know what your issue is too.
    My cars going in for its annual service end of Jan and they will look at the air-con at the same time so will provide an update here.
    Regards Mark Bedford

    2007 Blue Audi RS4 Avant
    Miltek non-resonated inc valves exhaust
    (no sunroof but tick the carbon ceramics baby :) )

  11. #17
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    My car's passenger air con vents are taking longer than usual to be cool. Even when it eventually gets cool, it's not as cold as the driver's side.
    MY18 RS3 Sportback | PP2 | Matrix | RSDP | Gloss Black package | Ara Blue | Opti Coat Pro+ | Tinting

  12. #18
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    My S3 is a bit like that. I wonder if it's the foam that can break down over time clogging it up...

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  13. #19
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    Nov 2011
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    I nowadays when its over 25degrees, just press the air-con recirculation button so its not pulling in hot air, and set it to 20degrees, and it seems to be working pretty well. I also wrapped the 2 silver aircon pipes in the top left of the engine bay to insulate them. They are COLD and sitting in a HOT engine bay, so I thought to insulate them. Don't know if that helped much or not.

    P.S. check out my young mechanic :)

    RS4 engine.jpg
    Regards Mark Bedford

    2007 Blue Audi RS4 Avant
    Miltek non-resonated inc valves exhaust
    (no sunroof but tick the carbon ceramics baby :) )

  14. #20
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    Quote Originally Posted by beanoyip View Post
    My car's passenger air con vents are taking longer than usual to be cool. Even when it eventually gets cool, it's not as cold as the driver's side.
    I would look at the air conditioner control valve. Ive just replaced one in a golf GTD and it fixed that exact issue.


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