Question about 1991 Cadillac DeVille

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No heat fog's up inside

Heater core fog's up in car no heat 1990 deville

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Do you want to know if it is the heater core. If you perform a pressure test on the cooling system it will pin point the source. But I does sound like the core.

Posted on Jun 01, 2009

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Posted on Jan 02, 2017

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There is a mist that comes from the vent near windshield inside the car and fogs it up leaving a residue.If heat is on the inside of car will get filled with mist


You have a leaking heater core. This is not the kind of job I recommend for the less experienced. Quite complicated.

Dec 30, 2013 | 1990 Volvo 240

1 Answer

1994 Caprice LS. Little to NO heat.


It will be the heater core. If you can smell it inside the car and it's steaming up the windows the core will need to be replaced. Remove the heater core housing and check to make sure its leaking from the core itself. You might get lucky and have a leak from the hoses running to core instead. Hope that helped.

Nov 17, 2011 | 1994 Chevrolet Caprice Classic

2 Answers

Windows fog up


Could be either a plugged vent tube in the heater box [ it's on the lower outside of the firewall ] letting the water puddle and then evaporate when heated, or a leaking heater core. If it's the heater core, you will smell coolant inside the car and may have a wet area on the passenger's side floor.

Apr 12, 2011 | 2003 Chevrolet Malibu

3 Answers

My cadillac is not giving me any hot air ,ive replaced the radiator, changed the thermostat, has a new water pump, where do istart to look.


Feel the 2 tubes at the firewall for the heater core. If they are not getting hot, the heater core needs to be flushed out or replaced. I had this problem with a 1990 Cadilac Deville, it was just a plugged up heater core.

Remember to install sealant after flushing out the system to prevent leaks.

Jan 25, 2011 | 1992 Cadillac DeVille

1 Answer

While driving my 95 explorer i noticed the heater wasnt getting hot its luke warm and when i turn on the defroster i start to smell anti freeze and all of the windows fog up


no heat is probably low coolant or bad thermostat,although you have fog and smell ! the heating and cooling systems are closed systems the only way the windows fog is the coolant is hot and steams inside the car due to some leak inside the heater core box. as well as the smell being present. Now it is possible that a little leak has occured where the coolant supply or return line connects to the heater core and is running into the car which is running onto the core and creating steam and smell. hopefully it is a easy clamp tighten fix for you.

Jan 13, 2011 | 1995 Ford Explorer

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

I have a 1990 subaru loyal, it runs fine but there is a problem with the heat. the heat coming from the heater core isnt very hot, its barely warm. the car gets up to running temp and doesnt overheat. when...


A clog can cause low heater perforance in the winter. I had a 1990 Cadillac Deville that had cold air blowing in the middle of winter, and had the system flushed and that solved the problem.

One can feel the two heater tubes at the firewall leading to the heater core to verify whether or not the antifreeze/coolant is getting hot at the heater core.

Good luck on this repair.

Dec 18, 2010 | 1993 Subaru Loyale

2 Answers

Windows are fogging. Cabin filer was replaced and


sounds like your heater core is bad check for moisture on floorboard, if found have core replaced ASAP an keep coolant level checked

Oct 03, 2009 | 2002 Cadillac Deville

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