I have a 2002 Disco and no matter how the A/C level is adjusted ie floor,head level,or defrost the cold air comes out of the defrost and frosts up the windshield.Does anyone have a clue?Also where can I buy the plastic cam followers that move on the guide track for automatic windows?

Regards
Jude

 

Have you read in your owners manual on how to do a slf test on the a/c system, if not do so and get back to me with the code number.
Make sure you perform the test out side in the heat of the day.
Just a thought, you didn't turn on the front window defroster???
Mike

 

I have the same problem on my Disco, air is always coming out of the windshield defog vents and in the humid summer we are having it fogs the windshield. It's like the vent doors are not moving/closing/sealing - is this common?

 

Well, since you attached to a post from 7 years ago, I guess not. But more likely, yes, it could happen. There are electric servo motors that connect to the HVAC control units, and direct air when they are told to do so. Could be stuck motor, wiring problems, etc. All found in the RAVE shop and electrical manuals.

Had same problem in my Mercedes wagon, rolled up a sweat shirt that was similar color to dash and laid it over those vents. Boosted output of other vents a little.

 

Air is always going to flow out the defrost. It is a design flaw in the duct. At the back of the duct where the flap is that opens and closes the duct there is about a 1/4 inch cut out to allow airflow to the top of the dash. Only way to prevent air going up to the windshield is to to plug those openings. I have my dash torn apart at the moment and when the sun gets a little higher I will post photos of what I'm talking about.

 

As you can see by the attached pics, there is no way not to get A/C coming out the defrost unless you cover those sections where the light is shinning in.

 

Yep, time for a sweatshirt or this time of year a beach towel.

 

Does it in both of mine...haven't thought to pull a sweat shirt out yet, but cheap sweatshirt is next on my to do list now!

 

Then you have something to pull on should a new boneyard "appear" on that well researched weekend trip - "look honey, they may have a roof rack...."

 

Beach towel for me in both mine. We normally don't get this many days of this high humidity. ( its high here all the time but never rains like this all summer) Maybe that is the difference.