Question about 1988 Chevrolet Caprice

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Heat whenever i turn my heat/ defrost on, my windows fog up and doesnt clear up. there is steam that comes into my car and also there is no heat comin out of my front vents..... whenever im driving heat may come out of my upper dash vents only..... whats wrong?

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  • Douglas May 11, 2010

    Sounds like the heater core may have a leak do you smell antifreeze?



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  • 59 Answers

So I am guessing the heater core, the only other thing it would be would be any leak that is allowing moisture in the car. is the floor board wet on the passengers side?

Posted on Feb 23, 2009

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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.

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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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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?


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My front defroster is not working at its best, however the back one is working properly. If I add any heat while trying to defrost my windows the problem get worst.


Sounds like the heater core is leaking coolant. If it is leaking it will blow steam out of defrost vents and fog the windshield. Symptoms: low coolant level in radiator, steam coming out vents when engine is warmed up, odor of anti-freeze coming out of vents, wet carpet in floorboard near heater blower motor.
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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...


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