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Q:

air conditioner on 2001 BMW 530i

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my air conditioner on my 530i 2001 doesnt blow any air, could that be a fuse or a relay switch
(2) Answers
check to see if it has a superseded fan speed resistor fitted.
old style has approx. 15 fins while the new style has approx. 40
if old style fitted replace fan speed resistor
out of all bmws, e39 (your model) are the easiest
http://www.bimmerfest.com/forums/showthread.php?t=143393

I followed these instructions and reparied myself. Longest time was waiting for the part as I did not want to pay the dealer 2x markup.