Hello everyone,

When it's cold, I found lot of condensed water inside on the front and rear
windshields.

I would like to know where the condensation drain is located when the car is equipped with air conditioning.

I suspect it is unplugged or improperly positioned

Any other suggestion is welcomed

It is a model W211, 420CDI, 2008, with 16000 km only and I found it quite unusual. Even on old cars I never had that.

If someone could help me with photos if possible.

In advance thank you

Merry Christmas and Best Wishes.

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Keep us posted especially if your problem is solved
Present cars:
My car: E-class 420CDI, 2008, W211, V8, 180 000km

Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km

Son's one: GLK class 220CDI, 2009, W204

Sold E class 260E, W124, 1988 beloved car sold after 489 000 kilometres of reliable services (engine M103, clutch and 5 speed manual gear box all original).

E-class, W210 320CDI, 2000[/B], 225 000km, Sold

I would suspect that the drain(s) come out beneath the car close to the firewall area. Run the A/C and crawl underneath to see if water is draining. I would also look into your sunroof drains to make sure that they are not blocked. If the condensation is quite significant I would suspect either the latter or a bad glass seal allowing moisture into the car.

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1989 300CE

cc260E, did you find the cause of this?

With my '84 300D, if it rains, I don't notice any moisture in the car. But when it's cold, the inside of my front windshield has enough condensation it takes an entire dish towel to soak it all up.

Anyone know if this is pretty normal?

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1984 300DT - Los Angeles - 160k

I would not think that to be normal at all. it depends on the conditions surrounding shutdown of your car. was it muggy and wet and warm when you turned off the car then cold the next morning? if so, that could account for the moisture, also, if you are running your defoggers with working a/c, the compressor will run, and pool moisture in the condensate, then it could evaporate into your cabin when you shut down, then the heat from your heater core could evaporate more, and it could freeze/condense onto your cold glass.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Thanks vstech! Yes, what you describe sounds right -- running defrost with working a/c, next morning my front window's loaded with condensation. Perhaps I'll just try laying off the defrost when I can and see if that does the trick.

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1984 300DT - Los Angeles - 160k

It is possible that your outside air intake is blocked with snow, or for some reason the HVAC is on recirculate.

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Gone to the dark side

- Jeff