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Old 12-02-2012, 04:02 AM   #2
cityjohn
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Join Date: Nov 2007
Location: Los Angeles
Posts: 2,467
My Ride: 2001 M3
Quote:
Originally Posted by Robaidh View Post
Any ideas on what it could be?

thanks

Humidity and condensation. If switching on the defroster automatically turns up the fan and heat, try this: Set the controls to manual not auto, turn on the AC compressor and set the heat to a mid position like 23 degrees or so. Set the fan to a medium level.

The effect of the air conditioner will dry the air and keep moist air from accumulating on the inside of the cold glass, which is what's causing all the misting.
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