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Posted on Dec 05, 2009
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Windows fog up on the inside when defroster is turned on

When I turn the car on on a cold morning and turn the defroster on, all the windows get fogged up on the inside of the car.

  • Anonymous Mar 21, 2014

    98 Camry fogging inside even with defroster blowing

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  • Posted on Dec 05, 2009
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Leaking heater core. The coolant level may be low also. What it is doing is fogging up the window with the steam coming from the hot engine coolant that runs through your dash board when the heater or defrost is on. This should be under some kind of warranty on an '08.

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I have a 1999malibu that is foging the windows up worm weather or cold what makes that

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Once the air that's coming out of the vents gets warm, it will defog the windows. It just takes time. Some cars take longer than others. I have an '86 Ford F150. It blows hot air the minute you crank it up and turn on the heat. I also have an '05 Mercury Mariner. It takes nearly 20 minutes. Once the engine is up to normal operating temp. it should warm up and defog the glass. If it never warms up you could have one of a couple of issues. 1. Your coolant (water/antifreeze) level is low. Check it and top it off with a 50/50 mixture of water and antifreeze. You can buy it premixed at any parts store or Wal-Mart. 2. Your heater core is clogged/leaking. Get it checked out. Good luck.

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Curt Downs

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  • Posted on Jan 04, 2009

SOURCE: The inside of the car fogs up and on very cold mornings ice forms

This can be caused by a heater core that is leaking inside the car, one way to determine if that's the problem, is if you can smell antifreeze. It is a 'sweet' smell, and is quite noticeable. If u don't notice this, I have to say this is a common problem w/ Hondas. I've had a civic, 2 accords (currently have a 92), and 2 Preludes, they are great cars, but they all suffer from fogged up windows in cold weather. One reason is that they are quite air tight, and the older models don't have the greatest defroster system (weak). Try and keep a window cracked open slightly, see if that helps.

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I have 94' standard Trans mission my defroster blows a fog and I think its a coolant fog what could be the problem?

If the fog is oily, then your heater core is leaking and the blower is blowing coolant onto your windshield
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How do I stop the inside of windows from fogging up

You need to switch your air flow from recirculate...to out side input...the recirculate always fogs up when cold or wet outside...Hope this helps. Use the defrost mode...but be sure recirculate is off...
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Windows fog up

There is too much moisture inside the cabin. Either something is leaking water into the car, or your fresh air setting is not working on the hvac system. You can not run the system on recirculate and get rid of the moisture.
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When I turn my heater and defroster on, a bad smell starts and the windows fog up but the air is hot.

This may be due to a bad heater core or dirty core with a plugged water drain, first see if the a/c works. turn it on and see if the air gets cold and if the ac compressor works.

The way the defrost works to keep windows from fogging up is that when the front defroster is tuned on the ac should also be on, on most cars when you go to defrost it will turn ac on automatic. the system then uses hot and cold air to remove the moisture in the air to avoid window fogging. if your a/c is not working then that may cause window to fog, but if you are also getting a smell then the drain that lets out condensation may be plugged and then water builds up and also mold from always being wet and when heat is on you smell that.


i want you to run the defrost and when windows fog up wipe window with hand and see if it is greasy . if it feels oily then you may have a bad heater core, the core leaks coolant out and steam and causing windows to fog up with a flim of grease.
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Condensation inside Chrysler 300 when cold outside and windows fog up

You must be a dumb blonde! TURN ON YOUR DEFROST!!!!!
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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.
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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.
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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).
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No cabin heat.. windows fogged.. engine runs cold!!

chances are the heater core is clogged and wont allow proper circulation for the heater.i would suggest getting a new one put in and see if that dosent fix it for you.
1helpful
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The inside of the car fogs up and on very cold mornings ice forms

This can be caused by a heater core that is leaking inside the car, one way to determine if that's the problem, is if you can smell antifreeze. It is a 'sweet' smell, and is quite noticeable. If u don't notice this, I have to say this is a common problem w/ Hondas. I've had a civic, 2 accords (currently have a 92), and 2 Preludes, they are great cars, but they all suffer from fogged up windows in cold weather. One reason is that they are quite air tight, and the older models don't have the greatest defroster system (weak). Try and keep a window cracked open slightly, see if that helps.
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