heating not working

Check this out, it might help: http://repairpal.com/i-have-no-heat-what-could-be-wrong

I just replaced mine. I had to take the dash apart and on the passenger side by the heater core is a small switch that cost around $180. It sounds worse than what it is, you need to pull the dash up and back, just far enough to get in to it. It's held in by 3 screws and a plug located by the heater core. Tear apart/replace/and put back together was around 2hours. DON'T waste your $$$ on a new control panel like I did.