The heater has stopped working on my car. The seat heaters work fine, and I am not 100% sure if the rear defrost is working. The AC works fine, but no matter what temperature I set it at (I tried 75 with no AC on) and it just blows cold air. With the AC on, I can eventually defog the windshield, but that leaves me freezing inn the process. I've heard a couple of different theories, but they are all different, so I am wondering what I should do. I looked at the fuses, but am not sure which one controls the heat. I understand if I remove the panel under the glove compartment, there is something I can check there, but not sure what. Any ideas? Help? Sorry if this question has been asked and answered before, but I just started going through forums to see if there was a relatively painless fix.