Question about 2000 Audi A4

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AC Problem I bought a used 2000 Audi A4 1.8T 6 months ago. It ran great up til 6 weeks ago. Now it seems to be one thing after another. I am currently experiencing problems with my a/c wanting to work properly. When I get in the car after it has been sitting in the sun all day while at work. I turn on the a/c and it smells like **** coming from the vents. It only last until the a/c gets cold. Also, while the a/c is running the compressor will disengage and blow hot air for awhile. Yesterday the compressor quit working entirely on the way home, until late evening when it was cool outside it started working again. I put my gages on the low pressure side and it is NOT low, in fact it's reads right where it should be. What would make the a/c run part-time like that? One more question...My check engine light came on a while ago and set a service code of 1128. I thought it was the MAF but found out it was the spark plugs (they have been changed). How do I reset the service light? Thanks for the help!!

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  • maynard5 Jul 22, 2008

    Thanks for the advice j_del! The vacuum info is great!!! I will check on the fan switch under the hood. Thanks again!



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As far as your AC goes, if the high/low fan switch (under the hood) fails, it can keep your AC from blowing cold. The switch is cheap (I think I saw a price around $12 from and could be an easy fix. I have the same problem on my 99 A4 currently and am working on diagnosing it.

The P1128 code is often the MAF, but can also signify a vacuum leak. If you want to search out a leak, try this:

The other option of course, is to inspect your vacuum lines and look for any that are dry-rotted or cracked, or unplugged entirely, and replace any that are suspect. If you have another Audi A4 owner nearby who would allow you to swap the MAF from their car temporarily to diagnose your problem, that would help a lot.

I believe that you're going to have to use a code scanner (or ideally, VAGCOM - the VW and Audi diagnostic software) to reset the Check Engine light - most of the codes our cars throw aren't self-clearing. It may go out on its own, but you'll probably have to do it with a computer.

Posted on Jul 22, 2008

  • Jeremy Dellow
    Jeremy Dellow Jul 24, 2008

    No problem:) If this doesn't fully solve things for you, post back up as a reply here or request me and I'll see what else I can do to help you solve it.



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