Moisture accumulation on windows (inside)

[BMWTurboDzl]

Originally Posted by Quattro Pete
Originally Posted by SubieRubyRoo
Pete this can also happen if it was really hot and humid the day before, and overnight gets really chilly. I've had this happen on several occasions, with different vehicles, here in the lovely Midwest autumns.
That actually was what happened - it was really hot and humid on Wed, then cooled off on Thurs, and got even colder last night. I noticed the condensation this morning.



That's it. The window just gets cold enough at night to cause moisture to condense on the interior surface. You wouldn't normally experience this in Florida. My E46 used to get it on the lower rear window.

On except the coldest of winter months just drive with your AC on and that'll dehumidify the air before it gets heated.

 

[Trav]

Its probably normal condensation but look under the back seat for dampness, I remember one of these with a leaking sunroof that wasn't found until the guy was wearing the headliner like a big sombrero. Make sure every piece of carpet is bone dry all the way up to where it ends in the foot well.