Hi Jeff. I had the same problem, along with others on my 03 Denali. Along with not blowing hot air from the rear heating system, I had hot air blowing out of the passenger side and cold air out of the drivers' side vents. My battery would go low and had the same smell. I took my Denali in to the dealer and they found it was a bad Fan Control Module. They replace it and everything worked well after. It cost me $293 for parts and labor. Hope this helps.
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If you smell coolant inside when you turn the heat its, because your heat condenser is leaking. You won't notice it because the drain port is outside at passenger side. You must have a very slow leak for now but eventually, it will get bigger then you will notice it.
heating core has been plumbed in wrong or most likely has a leak in the system, as you are smelling the antifreeze - seems to me like the antifreeze is not reaching the core, have you mistakenly plumbed the intake/out take the wrong way round?, this would cause the windows to fog up as the heat is being taken away fro the core rather than being taken into the heater core
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
I'm pretty sure if it were the heater core, you would have antifreeze soaking your carpet, and the inside of your car would smell of antifreeze. Your inside windows would also fog up when you turn on the heater.
your heater core has gone out, thats why there is no heat and thats from leakage of antifreeze. Usually when you can smell burnt antifreeze it usually points to a blown head gasket or cracked head, smell your exhaust and if you smell antifreeze theres your culprit