My heater useto to work last winter and now its not working. I just put a new thermostat and nothing during the summer my a/c was not working so I changed the thermostat and went to have freeon put in car my a/c worked for about 3 weeks and no longer worked anymore. They said I may have a leak. Does the leak in the a/c have anything to do with the heater? When I turn the heater on regular air comes out and my defroster doesn't work any more either. I have no idea whats going on, can someone give me a little advice?