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When it rain my windows fog up on the outside of the car and i turn on my defroger but my heat doesnt work so what could be the problem?

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  • Chevrolet Master
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Thouroughly clean your windows with window cleaner. There is likely a film on them that's trapping the condensation.

Posted on Jul 31, 2013

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SOURCE: Fogging of the Windows

sounds like you need a new core..

Posted on Jan 20, 2009

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SOURCE: My windows started to steam up do the moisture

to clear the interior of fog you must put the fan on recirc and #3 fan position.with the a/c on HOT.it will clear as soon as any heat from the engine is allowed to the heater matrix to dry out the interior.if you allow fresh air into the car with fogged up glass,they will get worse as the temp is warmer inside the car than out.(they collect condensation).

Posted on Oct 28, 2010

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SOURCE: I have a real safety

check the filter<hemodifier>, i beleive you have to replace if blocked

Posted on Oct 30, 2010

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I have a 2005 Impala. The windows fog up on the inside when it is cold outside or it is raining. They really fog up bad, to the point you can't see.


a fix for this is to run the ac
this although make it cold removes the moisture from the air inside the car and reduces the fogging up
if you have climate control run it or if not run the heater at the same time to take the edge of the cold
The air conditioner works by removing water vapor from the air through a condensation process there by making the air feel cooler
that restricts the moisture available to fog up the windows

Nov 26, 2015 | Cars & Trucks

1 Answer

Window fogging


If it were a leaking heater core, the inside glass surface would have an oily film along with the fog.
It sounds like your fresh air intake is not working. You have to get fresh air from the outside to be able to get rid of the excess moisture inside the cabin. Or you have excessive moisture inside from a water leak that the system can't overcome.

Feb 05, 2014 | 2001 Chevrolet Malibu

1 Answer

Rear window defroger does not work, lite on switch does not work so i feel it's a relay or fuse under the hood. I checked the fuse boxs but came up empty.


I had the same problem, from lifting the rear hatch cause the wires to the defroger break. some quick wire splices and it was back working.

Jan 12, 2012 | Chevrolet Metro Cars & Trucks

1 Answer

The windows on my 2005 Chrysler Pacifica fog up or ice up


IN COLD WEATHER USE BI LEVEL AND TURN ON HEAT ON AC AND HEATER MODE SWITCH AND HEAT MODE THAT WILL KEEP WINDOWS FROM FOGGING UP KEEP CAR WARM ON THE INSIDE WHEN COLD OUT SIDE ALWAY CARRY PAPER TOWER OR SOME THING TO WIPE WINDOWS WHEN FOG UP MOST TIME I HAVE PROBLEM WINDOWS FOGGING UP WHEN YOU HAVE COLD RAIN OUT SIDE.IF WINDOWS FOG REALLY BAD I HAVE TO TURN MODE SWITCH TO COLD MODE AND TURN ON DEFOGGER.

Oct 23, 2011 | 2005 Chrysler Pacifica

1 Answer

My 2002 Toyota Celica fogs up and collects moisture on the windshield during or after a rain. Visibility is a major problem. Need help, this is truly unsafe.


Can be that your heater core or hose inside car is sometimes releasing alittle heat at the clamps. So long the inside of the floor is not wet or damp or car is not over heating. I would not worry about the heater to much inside unless this does not work...
Change the automatic climate control up or down to cooler or warmer i usually run it at least upto 10 or 20 degrees different than the outside anytime i drive mainly during rain or snow.. So if outside it is warmer means you need to be cooler and cooler means get warmer. Also If you don"t run that on a regular basis a quick Ac on and defroster front and back works well and generally fast.I really think that is all of your problem just get comfortable with your automatic climate setting. once in a while it may happen again only because of rapid temp. changing from outside air to inside air in your car..Rain X works really well for a couple weeks between apps.and saves wiperblades during raining times. Always drive safely and good luck 11_21_2011_5_34_27_pm.jpg

Aug 16, 2011 | 2002 Toyota Celica

1 Answer

Why my window is fogging whe i turn the heater ?? i recently bought my toyota carina 3 model 1994 but the window is fogging , what should i do?


Make sure the vent system is set to draw air from outside. If it is set to recirculate the same air that's inside the vehicle without drawing fresh air from outside, the resulting humidity that builds up inside the vehicle can fog the windows even when you run the defrost. You can also try opening the windows a bit to get some more air moving inside.
If it still fogs when the vents are set properly, you may have a leaky heater core. The heater core is a small radiator that is located under the dash that the heater system blows air through to heat the inside of your car and provide heat to defrost the windshield. The fog may be coming from the heater core leaking hot coolant steam that's being circulated through the defrost system. If this is so, you will need to replace the heater core.

Jan 07, 2011 | 1997 Toyota Corolla

1 Answer

My windows started to steam up do the moisture outsides and the rain,so I turned on the window defrost button and blast cold air,bu the windows kept fogging up further, I used the windshield wipers to...


to clear the interior of fog you must put the fan on recirc and #3 fan position.with the a/c on HOT.it will clear as soon as any heat from the engine is allowed to the heater matrix to dry out the interior.if you allow fresh air into the car with fogged up glass,they will get worse as the temp is warmer inside the car than out.(they collect condensation).

Oct 28, 2010 | 2009 Honda Accord

3 Answers

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

Dash turned blackish brown and raise up at the windshield causing


It sounds like your heater core may have sprung a leak causing your moisture problems.

May 27, 2009 | 1997 Kia Sephia

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