I have a 2002 Dodge Ram 1500, 4.7 V8, 5 speed, 72568 miles my ideal is staying at 500 rpms when I am sitting still, and my heater only blows cold air when I am driving or I keep my foot on the gas to keep my ideal at 1000 rpms, how can I fix it so my heater is hot all the time?
I was wondering if you had looked into anything yet. Your thermstat might be bad. So change thermostat with a hotter one and that should take care of it. It would be the first and mostly the cheapest thing I'd change.