my e46 (IHKA) has a damp, musty odor from the air vents when in fan only mode after the A/C has been on. Seems to be slightly worse when outside air is selected, but still noticable in recirculate mode. I've read many things on various forums about this, and tried every method suggested to try and combat this, plus a few more things. Nothing has worked, and I'm completely out of ideas. Here's what I've tried so far: - replaced microfilter - sprayed down evaporator with lysol sanitizer & modified garden sprayer - run a can of wurth a/c & heating system cleaner through the system - used a wurth odor eliminator fogger aerosol with the a/c on recirculate. - removed the blower motor, cleaned the fan blades, cleaned the housing, sprayed the evaporator down again with lysol. When the A/C is on, and outside air is selected it smells ok, no real odor either good or bad. When A/C is on, and recirculate mode is selected it smells of one of the cleaners I used. No idea which, but it's a pleasant smell. In either outside or recirculate mode, as soon as I switch the A/C off leaving fan only, I get the damp smell. The only other idea I have is taking it to the dealer to have them perform the evaporator spray down. They should be using the same stuff I did, but possibly with a slightly more powerful sprayer. I'm dubious as to whether this will help at this point. If anyone has any suggestions, (no matter how much of a long shot!) I'd really appreciate it. I'm finding myself not enjoying driving the car as I'm constantly messing with the A/C controls trying to see what does and doesn't produce the smell. Thanks for any advice.