Your car could be low on antifreeze or your heater core could be clogged. With my car, it was Heater matrix clogged with radiator sealant. The workshop cleaned it and it's start working fine!
Your heater core has a hole in it. Antifreeze is leaking out and evaporating onto the cold windshield and glass areas.
Yes, if your vehicle is low on antifreeze, there may not be enough to fill the heater core, and you wont get any heat. When the heat stops working in your car, antifreeze/coolant should be the first thing you check.
You have a leaking heater core. You might smell antifreeze if you turn on the defroster.
Not very well.
If it is leaking inside the car, the heater core has failed.If it is leaking inside the car, the heater core has failed.
Typical of the heater core leaking. Overheat because of low fluid and pressure. Foggy windshield due to heater core leaking and will smell antifreeze in the car.
possibly a leaking heater core look for antifreeze dripping into the interior of the vehicle. usually it is the core or hose connected to the heater core.
You have either a cracked heater core or bad heater hoses that are allowing antifreeze to enter into the vehicle............
if you can smell antifreeze you need to replace the heater core in the vehicle
Maybe it is out of antifreeze? If older car, maybe you need the radiator and heater flushed.
Your car shouldn't "burn" antifreeze. If it actually is "burning" antifreeze then chances are you have a blown/leaking head gasket or possibly a cracked engine block which allows antifreeze to enter the combustion chambers. If your antifreeze is just disappearing then it is probably leaking out from somewhere. Possible leak areas to check out would be the radiator hoses, heater hoses, radiator, water pump, and the heater core. Most of the time if the heater core is leaking you'll be able to smell the antifreeze inside the car while the engine is running and the heater is on.