Tip & How-To about 2006 BMW 550I
The smell from the A/C system is from bacteria on the evaporator. For the same reason one puts distilled water in cigar humidors and room humidifiers to avoid this, there's bacteria in the condensation that forms on the evaporator. Clean your evaporator. Possible solution is to the turn up the heat on the A/C and have it blasting to kill the bacteria that resides in your A/C vent system.
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