I'm a Dodge owner bit twice. Had a new 95 2500 lemon and couldn't get Dodge to fix it. Then I bought a 2006 3500. Electrics are crap but I still like the cummings. My turn signals work crazy. My wipers are crazy. Now it reads hot and the engine is not. Thought it might be another problem with the guage or somethin until today when I turned the heater on. When it reads hot I get warm air. Then when it returns to normal, I start gettin cooler air. It will peg out and then drop back down to 220 or just stay at 220 most of the time. I also collect vintage motorcycles and hate workin on trucks so I thought I would see if I could get some experienced help here to short cut troubleshootin problems I have.