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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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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles
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