I have an 02 Bounder and the thermostat control is a problem. When turning on the air conditioning, the heater comes on. To turn it off, I had to shut the main breaker off. Next I had to unplug the 4 prong wire clip from the control module to keep the furnace from coming on.
Questions 1) is this a thermostat problem, 2) or a heater control module problem.