You get into your car on a cold winter morning, start it up, and wait for the engine to warm up so you can turn on the heat. Then, it happens… cold air comes blowing out of the vents! “What?! Why isn’t my car heater working?!” Well, it could be happening for any number of reasons. I’ll explain in more detail shortly. I will also give you some background on how your car’s heating system works and what you can do to make sure it’s properly maintained.