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Originally Posted by dtf
J B, That has been a source of frustration for me too since I've had my W124 wagon (bought in 1998). It is a lousy climate control system providing very little air flow to the windshield for defrosting. What I do is use button 'B' with the upper center vent closed and the two side door vents open. This mode concentrates the air flow to the windshield more effectively. The 'fog' usually happens on rainy days above 45F. Sometimes popping the moonroof a little helps as it sucks the human respiration responsible for the inside fog out of the car. JimSmith has a good point in the clogged drains but maybe you are not giving button 'B' long enough time to work. Give me a manual system anyday!
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I don't think it's a time thing. I've run on "B" for over an hour and gotten maybe the bottom 6" of the windshield clear. I seem to get good flow, it just doesn't do anything. I'd pop the moodroof, but when it's pouring rain out it's not a good idea.
Thanks.