About a week ago my car started vibrating very badly but only when the a/c was on, assumed it was the compressor and went about my business waiting to replace it. Took a closer look today, when I finally had time, and realized that the actually fan blade in the auxiliary fan assembly is very loose.

My question is how to remove the aux fan to see the root of the problem before I go buy a new one (parts are much more expensive in Dubai than in US). I have found forums on how to remove fans in 99-02 Audis, but none for my year. Any assistance or guidance would be very appreciated.