Even tough i have lots of heat the windows on my charger fog up and will not un fog or defrost.

If the fog is oily, then your heater core is leaking and the blower is blowing coolant onto your windshield

That's not unusual if you have a lot of people in the car. I will fog up because the glass is colder then the warm moist air hitting it, so the water condenses on the glass. Two ways to solve this issue. First open the windows a small amount to get rid of the warm air and introduce some cold air. OR second, set your defroster from full hot to slightly on the cool side with air circulation from the outside as well (i.e blend air as opposed to only cabin air)..

Are you using the fresh air option ?
If you are, you could have excessive moisture inside the cabin. Running the hvac on defrost should kick on the ac compressor and bring in fresh air too.

you most likely have a water leak ,from somewhere im not sure where but ive seen it many times , check your carpets and your trunk area for moisture

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.

Heated air in large quantities is what gets rid of window fog. Make sure you're actually getting hot air out of the dashboard vents, and if not, follow that problem.

heater core may be leaking if fogging windows or flapper door closed

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.

You have a leaking heated core, the mositure is coolant seeping from that heater core and blowing inside the air ducting

windows fog up anytime I use the heater.....Have to have it on defroster all the time.?