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first warm day.....no cold air from vents :( .....where do i start?

Discussion in 'A3/S3 Forum (8L Chassis)' started by chazza55, Mar 24, 2012.

  1. chazza55
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    chazza55 got an S3 8L: living the dream

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    [Mar 24, 2012]
    so yesterday was the 1st time the car really got warm in the sun..........noticed the coolest i could get from the vents was ambient temp. :(

    last service (oct 2011) audi confirmed something like -5degC from the vents, so was ok then.

    So my question is: Where do i start looking for the problem?

    Is there somewhere in vcds i can look for an HVAC temp diagnostic?.......what are the other likely options i have? (other than paying someone to look at it....which i would prefer not to!)

    Any advice is much appreciated......would like to get it sorted before a possible hot summer!
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  3. bez101
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    bez101 Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [Mar 24, 2012]
    can you turn the econ off on the cc unit ?
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  4. chazza55
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    chazza55 got an S3 8L: living the dream

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    [Mar 24, 2012]
    i have the unit on "auto" all the time other than when i am using the front screen demist........ dont think auto uses the econ setting.

    even when set to "LO" the air is ambient temp.
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  5. bez101
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    bez101 Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [Mar 24, 2012]
    you need econ off auto off and set to low for cold air
    go do that you should have cold air
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  6. chazza55
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    chazza55 got an S3 8L: living the dream

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    [Mar 24, 2012]
    checked that out today......have to say that i still think only ambient air is coming out. :(

    does anyone know if there is a less subjective test i could do?
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  7. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Mar 24, 2012]
    Probably needs refilling tbh..... if you do a scan in VCDS I think it should throw a fault code if the pressure is too low....

    <tuffty/>
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  8. chazza55
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    chazza55 got an S3 8L: living the dream

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    [Mar 24, 2012]
    Cheers tuffty - will try to check for codes tomorrow.

    I am expecting to potentially be shot down in flames and told to wash my mouth out......but what are your views on this:
    Halfords | Air Conditioning Measure & Charge


    Is this something i should be leaving alone or is it worth a punt?
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  9. vfr800
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    vfr800 Active Member

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    [Mar 24, 2012]
    I leave the aircon system well alone and let people who have the right equipment work on it.

    I think a regas from a decent garage will cost about £40-£50. They usually hook the car up to a big clover box which removes the old gas, does a pressure test on the system, purges air and moisture from the system and then refills it.

    I while back I got a quote from a VAG specialist for about £100 which included the above and replacement of all the seals on the system.

    Worth doing before it gets any warmer.

    VCDS can tell you if there are any faults on the aircon system - like low pressure. Your fans should kick in when you switch the aircon on. The condenser should also get cold if it's working.

    Liam
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  10. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Mar 25, 2012]
    first thing to check is if the compressor actually engages...

    With the car running switch between econ and auto, and see if theres any change in engine note. The revs should blip momentarily when the compressor kicks in.

    If it doesnt, then its either low pressure, or some other fault like a dodgy compressor clutch or clutch relay, or even a break in the wiring somewhere.

    If the compressor runs but it doesnt get cold, then it probably needs a new drier and a regas.
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  11. chazza55
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    chazza55 got an S3 8L: living the dream

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    [Mar 25, 2012]
    cheers all - will do the checks then take the appropriate action.....best do it before it gets to the crazy hot british summers! :blink: ..........well they're hot enough for me so needs to be done.
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  12. chazza55
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    chazza55 got an S3 8L: living the dream

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    [Mar 30, 2012]
    %$(*&_(%(&^$ is the only way to describe it.

    - checked with my VCDS Lite and cannot connect to the HVAC controller.....only the engine one.

    - took it to be re-gassed.............no luck.......holds pressure ok and no leaks.....but compressor wont work apparently.



    Any bright ideas where to start looking or is it a replacement only job?

    And is it worth getting an ebay one for £100 that has come from a breakers?..........no idea how much audi would charge!
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  13. vfr800
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    vfr800 Active Member

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    [Mar 30, 2012]
    The first time my aircon went boobies up it was the aircon compressor clutch I think. Needed a new compressor and clutch and it cost a lot as it was from Audi.

    When my aircon wasn't working the second time. It was a combination of the fuses (check the three little green 30A blade fuses on top of the battery), the pressure switch and the fan control module.

    There are guides on the Internet for testing the fan control module.

    The fans can be tested with a multimeter to check they're not burnt out.

    I think the pressure switch is a common thing to go wrong - you should be able to see this from VCDS though?!?

    Liam
    #12

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