@ozziegoat
>>There is moisture on the inside of my windows
<< Condensation? That's normal.
>> the heat smells like brown sugar on fire.
<< Sweet heat?
"If there is a sweet smell coming from your car, then it's most likely leaking coolant (or antifreeze, for anyone that lives where it gets below freezing). Leaking coolant is a major problem. If your vehicle gets too low on coolant/antifreeze, it will overheat"
https://www.mbscottsdale.com/blog/why-is-there-a-sweet-smell-coming-from-my-car/
>>Is there a possibility my heater core is going out?
<<
"Here are the most common reasons why your car heater isn't blowing hot air. Low coolant: Whether caused by a leak or water evaporation, low coolant is the most common source of poor heater output. Thermostat: A stuck-open thermostat prevents the engine (and coolant) from heating up."
https://www.familyhandyman.com/article/if-your-car-has-no-heat/
>>And if so, is that the "throw the entire car away" repair?
<< No, but definitely something to take care of asap.