Fuse, I bought the Firestorm Heater also. Being that I live in Minnesota I had Motto Alliance install it for me. I used it today, 4 below, it did take a while for it to heat up which I expected. While driving I would lose heat occasionally and the fan would only blow cold air. I'm guessing that they either didn't completely bleed the system or didn't add more antifreeze. How hard are they to bleed or any other ideas?