Well, I had an overheating problem last week and thought it was just my neglect not checking the overflow. I filled the tank and "burped" the system, all seemed good till today, and again, I was out of anti-freeze! Not seeing a leak anywhere and I do smell coolant when the machine is hot and the fan turns on. I have been idling a lot lately using my Wet Sounds sound bar and subwoofer to keep the batteries charged, I wonder if that has anything to do with running hot?