Last year I had Sears replace a dead battery in my car. When I picked it up, the heater wouldn't work (just blew cod air). I argued with Sears and they told me it was not their problem. After several trips back one of their mechanics figured out what the problem was and fixed the heater. It has run fine until the other day when it was so cold out the car wouldn't start and the battery got drained. After jumping it I now have the same cold air problem. Does anyone know how to reset the system?