Question about 1992 Volvo 940

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Windows are fogging up when defrost is turned on. Is this a heater core problem? Can i fix it myself? how big of a job is it?

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When you turn on defrost,can you smell a sweet smell?
if so yes it's the heater core.
if you put it on defrost can you feel the air coming out of the dash?
If it's the heater core I suggest you don't attempt it.

Posted on Nov 18, 2009

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2 Answers

My 2002 explorer windows keep fogging up inside and does not go away when turn on defrost & my engine light is on like my heater core may be bad but I dont smell antifreeze what else could cause t


If it was me, the first thing I'd do is go check my fluid level in my radiator. I'd add fresh anti-freeze, if I hadn't done so in a year or more. Your defrosters won't work properly if you are too low on fluids in your radiator, OR your thermostat is malfunctioning. Replacing your thermostat might be a good job for a mechanic. Good luck.

Nov 28, 2013 | 2002 Ford Explorer

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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?


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 wife has a 1999 dodge ram 1500 truck, Im trying to see if I can get some help in a problem with the heater/defroster unit. When you turn on the heater or set it to defrost it blows out hot are like it...


The heater core is bad. It a big job. Part is only about $60 but a lot of labor you have to take the whole dash apart and out to change it.

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its about a 2 day job and involves removing the entire dash.. if your not sure i would ask a quote from the mechanic

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Heater core leak in 2002 Jeep Grand Cherokee Ltd


your heater core is leaking its not fog on your windows its from the antifreeze having same problem so im replacing it myself but having problems getting the dash off its a head ache the heater core costs 91.99 at autozone i priced the job at a few shops and it runs between 7 and 900 dollars.good luck man

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That is normally a classic symtom the Heater core has gone, Another is normally lost of coolant or smelling of antifreeze

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Frost on inside of window


your heater core is probably leaking.....this is a big job to fix you'll probably want to take it to a shop to have this done as the complete removal of the dash is necessary
Good luck.........thanks for choosing FIX YA!

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Hey mad40bx that will be your heater core,,just pick up a new one and grab a haynes or chilton manual for your truck if you are not familiar with the procedure its not that bad, if you dont need it fixed immediately take the 2 hoses off from the firewall (One is supply and one return) and couple them together this will bypass the heater core until you are ready to fix it, good luck

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