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thanks jordave! that link was helpful. looks complicated though.
i bought my x5 as pre-owned. I think the previous owner of it is a smoker. if my a/c is off, air that comes out really have a bad smell. but if a/c is on, air is just fine. don't know exactly what to fix or change. went to a dealer and they just suggest a complete change of the a/c system which is too much! oh well, i'll just check with other bmw shops nearby.
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