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Check the thermostat. It's almost like a "float" that allows coolant to pass through a hose. If it gets stuck, you have heating issues. Since yours seems to fluctuate, I'd bet it's a thermostat about to go. Fortunately, it's easy to fix and inexpensive.
That smell is most likely antifreeze. If the smell gets noticeably stronger when you turn on the AC/Heater, it is possible that your "heater coil" has started leaking. You will need the services of a professional if that is the case. Those are very hard to change.
Another possibility is your thermostat is not opening, causing your engine to overheat - steaming some of the coolant (antifreeze)/water mixture out of the system.
And thirdly, it is possible that someone spilled antifreeze on the radiator etc when adding fresh antifreeze - and you smell it after the engine warms up. If your car is not over-heating and you are not having to ad antifreeze/water to the radiator, then just keep driving. The problem will most likely go away.
I hope this is helpful to you. If yes, please take a sec to rate me. Thanks! Don
Make sure the ventilation is set to "fresh air", and not "recirculate" . There should be a button just below the heat control that shows the air flow. One has an arrow going straight in to the little car picture, and one shows the arrows in a circular motion. Set it to the straight one, the "fresh air". Fresh air is drier and your windows will dry quicker. There is always moisture in your car from snow and slush and rain and it takes forever to dry out. The only other thing it could be is a cracked heater core, and if it was that you would smell antifreeze when ever theheater was on.
The anti-freeze smells like it burning because it is coming in contact with your brake pads (will contaminate pads and reduce life and increase stopping distance, exhaust system (most likely cause of burning smell), or some other hot spot on the the engine.
You should resolve this as it will cause over heating as the system can not properly pressurize and reduced coolant level.
You could have two problems. First, does the engine require more oil than usual, is the oil level always low ? Does the transmission lose oil ? Could possibly be the trans. cooler in the rad. is cracked. Usually with a blown head gasket you get coolant into the engine, or burn it. ( white smoke ) Has the engine ever over heated ? On the smell part, this could be the heater core is leaking. Have a pressure test on the rad. to try and help find the problems.
If your heater core was leaking you would have antifeeze coming thru your vents and putting a greasy film on your windshield. You would smell antifreeze the stongest if it was leaking onto a hot engine part. low antifreeze will cause bad heater performance, I would check by the thermostate housing, and the water pump for leaks