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    Thread: A/C doesn't blow cold only @ idle. Fan turns off?

    1. Semi-n00b
      Join Date
      Sep 30th, 2011
      College Station, Texas
      2007 Audi A4 (B7)
      08-31-2012 02:00 PM #1
      Audi A4 B7, forge atmos. BOV, testpipe.

      During idle at a redlight, I could normally feel that the car was on. Now at idle while stopped, it seems like a fan shuts off... I can tell because the car would suddenly run very smooth when the fan kicked off. It would make me think my car died until confirming it was still on by looking at rpms.... then the A/C gets warm.

      When I start driving again, the A/C will return to normal and become cold again.

      My car will drop in rpms and suddenly die sometimes when coming to a stop. No bad noises, no clicks or put-puts... it just gets weak and shuts off. This only started happening with the A/C issue. Maybe they are related?

    2. 09-03-2012 01:48 PM #2
      I got the same AC issue. Haven't figured it out either.

    3. 09-15-2012 11:08 PM #3
      Regarding the A/C, I had the same issues a few months ago. Only ambient temperature air would blow through the vents while at a stoplight, but cool air would blow through the vents while the car was at speed.

      For me, the accessory fan shorted out, which in turn caused the fan control module to stop working. The accessory fan has to draw air into the A/C compressor at idle in order to cool the car interior. If the accessory fan isn't working at idle, then the compressor won't get the required air and it won't cool the car's interior.

      Also, check if the fans continue running at varying rpm for several minutes after you shut your car off. If so, the fan control module is likely at fault and will require replacement.

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