Question about 2002 Volkswagen Jetta TDI

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Windows fogging up

Yesterday while driving in the rain, my windows got really foggy and didn't clear up, even with the defroster running full blast. My air conditioner is broken (it has been since I bought the car) but I've driven in the rain before plenty of times and this hasn't happened. When I got out of the car, I noticed that the floor mat on the passenger side was soaking wet. It is wet with water, not coolant. I know that coolant on the floor is a sign of a broken heater core, but I'm sure this was water. Driving again today, I found the carpets were still wet. It was not as cold and wasn't raining but my windows still fogged up pretty quickly even though my fans/defroster/heater were turned off. I tried turning on my defroster but it took forever, even though it was obviously blowing hot air on the windshield. In addition, all the windows in my car got foggy and stayed that way for the entire trip. I plan on taking it in some time this weekend, but I just wanted to get an idea of what to expect. Two of the solutions I've found are broken heater core or a clogged AC hose. The AC hose would explain the water coming up through the floorboards and the fogging. I really hope it is not the heater core because I can't afford to fix that right now and I don't know enough about cars to fix it myself. Help?

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Posted on Mar 01, 2017


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Posted on Jan 02, 2017

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SOURCE: wet passenger side

I believe the problem is a leak in your heater core. The water would run down the inside of the firewall or near it thus running under the mat.

Posted on Nov 21, 2008

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SOURCE: 1997 jetta gls water gathers on floor of front passenger side

I had exactly the same problem. A drain pipe running down behind the Fire wall is blocked, You will find the pipe outlet in the enjin compartment. Open the bonnet of your Jetta and look low down at the firewall on the right hand side of your enjin. The outlet is hidden behind a black rubber cover. You can open the drain pipe from the outlet side.

Posted on Aug 08, 2009

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SOURCE: getting lots of water in driver & rear

could be coming from the windshild take a look on the outside around of it

Posted on Oct 29, 2009

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SOURCE: driver n passenger rear floor

The fault might be with air conditionar pipes u may cancel them or have them fixed

Posted on May 06, 2011

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Why do the windows on my 2009 caravanfog uponce Istart todrive?The windows will beclear after I warm it up but once I start drive they fog up.I do not smell antifreezeand the heater core lookslikenew.

windows fog up on the inside simply because of the hot breath of the occupants
this heat is cooled by the screen and condenses and so a fog is created
simple physics really - hot moisture + cold air =rain to over come this quickly run the air conditioner ( climate control) and that takes the moisture out of the air in the car and then the windscreen clears
you are going to say that it is too cold for the ac to run well at the same time run the heater until you have a pleasant temperature that is dry ( climate control--when it gets too hot the ac cuts in and when it gets to cold the ac switches off BUT the moisture that causes the fog on the windows is gone )

Nov 11, 2015 | Cars & Trucks


Foggy windows can be dangerous at night

Ever find yourself dealing with the windows fogging intensley during the day or night while raining or just other extreme weather conditions that come your way?
A real good product to use for this is called "Rain X", buy it at any major auto parts dept. apply to your windows prior to traveling, as per directions, and walla no more fogging.
Happy Motoring!!

on Jun 06, 2010 | Chevrolet Camaro Cars & Trucks

2 Answers

Foggy windows

I have a Toyota and they are not good at fog. go to parts store and rained makes a product fog x easy to apply you apply on the inside its about5 bucks or less it works

Dec 10, 2013 | Toyota Cars & Trucks

1 Answer

I have a 2009 lincoln town car, past 2 weeks when it rains my windows fogs up, sometimes it clear but comes back again. No smell.. what should I do?

Its normal for your windows to fog in rainy weather. If you defroster won't clear it up, then your heater core is leaking, which will just make more moisture on your windows due to the steam. Feel around the passenger side floorboard and see if its wet, and check your coolent lvl to see if its starting to get low.. odd tho, usually you will smell the sweet smell of antifreeze, but maybe its just starting to leak and its not really pouring out YET.. Warning, as time goes by, leak will get worse.

Dec 07, 2013 | Cars & Trucks

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Windows fog on inside while driving in cold weather, requiring me to run the defroster on high to keep them clear. The button that switches the cabin air intake from "outside air " to "recirculate inside...

Yes. Unless you get fresh air you will fog up your windows. Your breath or rain on your clothes or snow on your boots will all cause the humidity to increase and this moisture will deposit on the non insulated glass. Kind,of like a glass of ice tea on a warm day you will get a condensation on the glass. The temperature difference is the cause. Try to run your A/C with the temp set to hot. This will act as a dehumidifier.
also check your pollen filter make sure it's not clogged.

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How do I keep my car windows from getting foggy?

on your heater control you should have a selection button for outside air or recurlate this is useley a arow curcle or strate the strate arow is the one you need to use

Dec 31, 2009 | 1998 Honda Civic

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I have a 2006 Passat and everytime I drive it the windows fog up, any solution. I went to my local vw dealer and they have not heard of that happening before. But there solution was put rain x on the...

I had this problem too. this is very annoying, and also a safety hazard. After a lot of investigation, and a few trips to the dealer, the cause was determined to be a non-functioning recirc door. recirc door was stuck on, and humid air from the cars interior (wet shoes, breathing, etc.) was being passed directly onto the windows by the defrost system. Dealer closed the door, and it went away immediately. Recirc servo motor part was ordered, and replaced. good as new. was covered under pre-owned warranty. Hope this helps anyone else.

Dec 18, 2009 | 2006 Volkswagen Passat

1 Answer

Foggy windows

It may be set to recirculate the inside air, this is indicated by a symbol of a car with a swirling arrow inside, the button will be in with the climate controls. always use outside air if it is cold or raining and you will avoid fog

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