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Remove drivers door panel . look for a broken wire in all the wires there. May also be broken between the door and the body. Wish you luck in finding the broken wire.
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.
the windows are fogging up from the water vapour inside the car hitting the glass and freezing. All the heater is doing is making the water vapour evaporate into smaller particles and freezing quicker. The way to overcome this is to dehumidify the air in the car (take the water vapour out). To do this use the AC as this is what it is designed to do . run the heater at the same time and the glass will clear and stay clear. In most cars this is called climate controlled air conditioning.
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