As far as I know, thermostats are made basically of a piece of wax and cannot be reset to another temp. The Thermostat controls the lower temp of your coolant and the fan controls the upper temp. If you rig your fan so that its running at all times, you wont heat up much higher than your thermostat's openning temperature. Also, your air conditioning and your heater are run off of seperate systems. You can pull the entire A/C system out and run the heat just fine.