Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 02-03-2001, 08:26 PM
Registered User
Join Date: Dec 1999
Posts: 102
windshield fogging up

hey.. i dunno but the windshield in my c240 does not want to stay clear.. it is always fogging up... what is the correct setting to enable the defroster to work at its best?? Is there a trick to this??

[Edited by BmwTek on 02-03-2001 at 08:31 PM]

00 S500 W220
93 300SE W140
01 C 240 W203
86 SVO Mustang (Turbo Pwr'd.. hehe)
Reply With Quote
Old 02-03-2001, 08:47 PM
JCE's Avatar
JCE JCE is offline
Down to the Wear Bars
Join Date: May 1999
Location: So Kalifornia
Posts: 2,189
The AC on my 300E was not very intuitive - I had to read the manual to correct some wrong assumptions on my part. My controls had a defrost, EC, and O button which I figured out correctly. The remaining 2 buttons each had arrows pointing up and down. I assumed the one with the black up arrow and white down arrow meant "Heat or cool the feet area", and that the button with 2 white arrows meant "heat/cool all areas". Wrong! Turns out that the first one means "normal operating position", and the 2 white arrows mean "temporary position to dehumidify windows, switch back to normal (black and white arrow)position when clear"!!! I wonder if something similiar is going on with your controls.

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E
Reply With Quote
Old 02-03-2001, 09:09 PM
longston's Avatar
Another View. . .
Join Date: Dec 2000
Location: Mark West, CA
Posts: 787
A Foggy Day In Olde Mercedes Town...

Wow, small world, ain't it? I was just pondering the same dilemma. Not about fogging up, but about proper operation of the climate control! The deal is this, you shouldn't EVER have the system shut off except " in case of bad odor or automatic car wash". And I'd like to think that we are all too sophisticated to use an automatic car wash!

The rest of the time, it should always be on! To completely defrost the windscreen, you need to press the button with a picture of the windscreen on it. To defog the windscreen, you press the button with two white arrows on it, as JCE already pointed out. But then, you should go back to the either the "normal", or "economy" setting as soon as possible. If you still have an owners manual, read up on this stuff!

One other thing, when my Aerostar had a problem clearing the windscreen, and the problem actually worsened using the defroster, I found that the culprit was the heater core, which had just died!

[Edited by longston on 02-03-2001 at 09:14 PM]
"We drive into the future using only our rearview mirror."
- Marshall McLuhan -

Scott Longston
Northern California Wine Country...
"Turbos whistle, grapes wine..."
Reply With Quote
Old 02-03-2001, 09:47 PM
Beatle Juice
Posts: n/a
Check to see if the AC compressor is coming on when you turn on the defroster. It should operate when in the defrost mode.
Reply With Quote
Old 02-03-2001, 11:43 PM
Posts: n/a

I thought I was alone. My C 240 has the same problem. I leave for work at about 5:00am every morning, and during these cold winter months, my windshield, side wondows and rear glass all fogged up. I have tried all settings, and found that:

1. the defroster setting work best,

2. the "Auto" setting is also good, but the defroster setting is more effective.

But I try to use them least as possible, because at either settings, they are very noisy. Also, they would leave no warm air coming down for my feet, leaving my feet freezing cold.

In conclusion, I found that the climate air circulation system used in the new C-Class is very weak.

Reply With Quote
Old 02-04-2001, 02:41 AM
Registered User
Join Date: Nov 2000
Location: Tribune, Kansas. I farm for a living. I fly R/C airplanes for fun.
Posts: 53
The fogging up has happened to me on 4 american made vehicles........ and I ended up putting heater cores in. A very small pinhole leak that was pretty hard to even smell coolant from. Anyway, just another possibility for the windows being constantly fogged.
Ron Miller

1986 300E
Reply With Quote
Old 02-04-2001, 03:22 AM
Registered User
Join Date: Nov 2000
Location: Jacksonville, FL USA
Posts: 113
Make sure the recirculation mode is off (I dont think you can turn it on when in defrost or economy mode), this can really fog up you windows when it is left on long enough. Also if your a/c system is non-functioning and you still cant get the windows to defog, just crack a window about 1/2" this usually works. If you are really having problems there is antifog stuff on the market, I have never tried it so I dont know how well they work. Another possibility is the a/c compressor isnt kicking in because it is too cold outside, the a/c compressor on my Integra does not kick in when the ambient temp is around or below about 35 degrees.
2003 Volkswagen Golf GL 24,000 miles. 1.9L I-4 TDI 5spd.

1986 300E. 115,000+ miles. 3.0L I-6 1st daily ride, around town only. (Gone)
Reply With Quote
Old 02-04-2001, 08:42 AM
J.HIDALGO's Avatar
Registered User
Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Yesterday I read a review in my local newspaper on the C-240. One of the things they mentioned was the windshield fogging up...uhhhmmm.....Maybe we should get a pole of how many people, with the new C's, have that problem. I know Larry has one.
'86 300E
Reply With Quote
Old 02-04-2001, 10:27 AM
Registered User
Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
my experience is that you need your compressor
running whether you're using the heater or the
a/c, to avoid clouding your windows.

this happened to me last summer when the a/c
is on and then all of the sudden my windows fogged
up. took a while for me to trace the problem.
turned out i had a defective belt tensioner that
tipped off the clutch of the a/c. I thank steve
brotherton, tech of this forum for the advice.

hope this helps. try to do a search, belt tensioner.
my car is an 89 300E.

Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help: no horn, no turn signals, no winshield wipers Tump Tech Help 8 11-23-2004 06:14 PM
Fogging the skeeters whunter Diesel Discussion 5 08-01-2004 12:51 PM
Winshield Trim attachemt. nh500sl Mercedes-Benz SL Discussion Forum 0 07-19-2004 01:05 AM
87 300E winshield wiper spary motor dling1234 Tech Help 1 05-11-2004 12:25 PM
winshield washer pumps? Bzoo Tech Help 3 12-10-2002 02:08 AM

All times are GMT -4. The time now is 05:13 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page