"KOS" > wrote
> Hi, I just bought a brand new 2004 BMW 525i- the car runs perfectly -
> however, the other night, while driving, (it was not raining) when I
> started the car up and began to drive, the drivers side window and the
> rear passenger side window began to fog up, also the back window. I
> have the climate control set to 72 degrees and it is in the automatic
> mode. (I am located in New England) I remember reading somewhere in the
> BMW literature that it stated that if you have it set to automatic, the
> windows would most likely never fog up. If I have the climate control
> set to automatic, should the window fog up? please advise- being that
> the car runs in the 50$$K range, I figured that foggy windows would be
> solved. Also, I realize that if the windows do fog up I can hit the
> blower- that does solve the problem on a temporary basis, when I shut
> it off, its foggy.

If it was a cold night (or day FTM), say below 40 F, the a/c doesn't
really work to defog windows due to two facts: 1) it won't de-humidify
the air because it can't get cold enough (below 40), and 2) it often
goes into re-circulation mode if the engine and cabin are too cold to
effectively heat outside air.

No car's HVAC can do any better. However, I advise cracking the sunroof
or window to help exhaust humid air, not using automatic mode, manually
selecting exterior air, and using the defrost mode, which runs the fan at
high speed.

Floyd