Question about 2000 Chevrolet Impala

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2000 S10 Heater/Air

Have smoke or vapors coming from vents even when system is off
fogs up windows. Defroster is working good , but will not defrost these vepors

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YOU PROBABLY HAVE A LEAKING HEATER CORE. FEEL THE CARPET AROUND THE PASSENGER FOOT AREA. IF YOU HAVE ANTIFREEZE SOLUTION IN THE COOLING SYSTEM, THE WINDSHIELD SHOULD FEEL GREASY. ALSO CHECK THE COOLING SYSTEM WATER LEVEL

Posted on May 05, 2009

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You have a bad heater core

Posted on Feb 03, 2009

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1 Answer

1998 Nissan sentra ac bypass


Assuming that it is working in frigid conditions, sometimes The
Ac works with the defroster to remove moisture and the fog on the inside windshield. So, turn the defroster of unless you need it when the windshield fogs. You may be able to keep the window clear by opening the outside air vent and increasing the heater temperature.

Feb 13, 2015 | 1998 Nissan Sentra

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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.

Feb 03, 2013 | 2000 Chevrolet Silverado

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My 2001 jeep grand cherokee has a dark mist/smoke coming out of the vents, and defroster. But, the heater works fine. What could it be?


DO NOT USE STOP LEAK!!!!!! That stuff has no brain so you cant tell it to plug only specific leaks. It will go for the easiest hole to plug which can be a water port in the cooling jacket for the cyl heads. replace the heater core. Fix it right or bypass but please please please do not use anything that will stop a leak

Dec 22, 2012 | Cars & Trucks

1 Answer

Heater & defroster works fine but inside car windows keep fogging


So you have the vent settings to blow out of the windshield vents and still have fogging?

You can dry out the air more quickly if you use the air conditioner setting. It sounds backwards, but this is exactly what the manual in my older car said to do. (Some cars are electronic control and won't let you do this however - or they do it automatically with the defrost vent settings).

For the older car, I would set the heat to the hottest setting and press in the a/c button. The a/c dries out the air, but it does not have to be set to run cold.

Another thing that could help is to make sure that you do not have the vents set for "recycling" the air. The picture should look like a u shapped arrow. Make sure it is not pressed in.

Dec 20, 2011 | 1999 Oldsmobile Alero

1 Answer

Climate control system blows only through the defroster vents and not through the passenger compartment vents; the windshield fogs in high humidity and windshield wipers are necessary to clear the fog. ...


If the fogging is plain moisture and not coolant (it would take on a green hue and you would smell coolant if this is the case) than the issue is with the blend door actuator. This component diverts air from the window, to the vents and floor. You may have a "stuck" door or a defective blend door. If it is coolant you are seeing (smelling), you may have a bad heater core. When bad, a heater core will dispel green vapor through the defroster vent.

Assuming the problem is merely the blend door, you may be able to free the part (if it's stuck) by locating it (usually under the glove box or between the glove box and middle console.

Jul 31, 2011 | 2006 Mercury Grand Marquis

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

Window fogs up when heat is on


Not sure if this is the problem, but the symptom that you describe is consistant with what happens when you get a heater core leak. When the system gets pressureized, you likely have a mist spraying..like a vapor in your heater box. The fan then carries the mist to the cabin and moisture forms inside the car. Usually when this happens, it will be accompanied by an odor of coolant. Also over time, your coolant levels will drop. As the condition worsens, your passenger side floorboard could start getting wet. Good Luck! I hope you find this very helpful!

Nov 28, 2009 | 1995 Oldsmobile Cutlass Ciera

1 Answer

1999 Volvo S70 heater and defroster blowing "fog"


suspect leaking heater core.check coolant level.

Sep 29, 2009 | 2000 Volvo S40

1 Answer

Smoke coming out vents when defrost is on and temp gauge goes up and down in 1994 Taurus


The fluctuation in the temp gage indicates a low coolant situation. The smoke you see from the defroster vent is actually antifreeze that is leaking from the heater core somewhere and as the antifreeze evaporates from the heat it causes a vapor to produce. You should smell a very sweet smell when you see the vapor. If so it is definitely antifreeze. Find the leak and fix it. Then refill your coolant system to specs and you should be good to go.

Aug 21, 2009 | 1994 Ford Taurus

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