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If it overheats fast, then goes back down fast. You didn't get all the air purged from the engine. This would cause the heat/no heat in the car also. If you continually fill it and it keeps happening, Blown head gasket.
Could be a thermostat problem, or potentially a blown head gasket.
if you take the oil cap off and check under neath the cap (inside of cap) if there is sludge buildup i would get the gasket checked.
Also try check in the radiator, if it looks like there is gunk or **** in the radiator it may be just enough to block the thermostat sensor. Usually if its a thermostat problem the temperature dial doesnt move.
Firstly would check for head gasket, thermostat and note how fast it heats up, when does it overheat (on idle, driving on highway, driving round town, etc)
does the air temp change when you try to blow ac and or heat?? if it does change from cold to hot at your discretion and it is still fogging up you may have a leaking heater core and in which cases the "fog" you see on the windshield is actually antifreeze blowing onto the glass from the leaking heater core.
Sounds like a possible heater core failure(hole in it) the smell indicates to me the coolant(anti-freeze) is leaking into the passenger compartment. Check the carpet in front of the front passenger seat for moisture, this would confirm heater core leak. Good luck !
Your heating system is dependent on hot coolant to be circulated through your heater core, which a fan blows across, and you get heat. If you only get heat when you are moving, that means that either your engine is low on coolant, or the engine's water pump is not working well. Check your coolant level when your engine is cold.
heater speed switch in passenger side in foot area above toes in heater box one wire plug on it 2- 5-6 mm screws hold it in that is your fan speed switch they are a common issue it is the season for those now usually you loose 1 speed at a time until nothing don't be caught with out that not working at all you windows will fog bad!!!!and no heat period.