Heater not working

Thanks a lot! I will try those options and let you know how it went.

Well, I'm actually sitting in her car right now. I tried resetting it and now I'm not sure what exactly was wrong when my wife told me, but now the heat works only on the drivers side and is blowing out of the floor and defrost vents. The passenger side only blows cold air. Also, it won't change to different vent selection. It only blows out of the defrost and floor vents on both sides, but the temp only works on drivers side.
I know that the actuator on the passenger side, controlled the vent selection, but does it have anything to do with the temp for the passenger side? I don't think it does, but I really don't know. If not, what controls the temp for the passenger side? Could there be something wrong or disconnected behind the actual temp control console? I was going to take it apart, but then I thought I'm gonna ask you first to see if there's even a chance of that happening.

I have auto climate control. With separate heat setting for driver and passenger. I get heat o the driver side, but only cold air on the passenger side. Could this be aproblem with the heater door blender actuator?

Thanks, because I am taking it in to the dealer tomorrow for what I expect to be a $300.00 Bill. If it does not need to be replaced, maybe it wont cost so much. I will let you know what happens.

I don't believe in paying money for an extended warranty. I take pride in maintaining my cars. And I drive very easy on the vehicle. As a matter of fact, the last car I had, I went 97,000 miles on my original front breaks. For what they wanted for an extended warranty, I just put the money in the bank, and it is there when I need it.

Just came back from the dealer. Actuator was checked for sticking. It had to be replaced. Total cost: parts and labor was 266.00

I have a 2002 gmc safari van and the heater is blowing cold air, the blower motor is working but no heat. I changed the thermosat, the van comes up to temperature but still no heat. Heater core fine, is there a bleeder valve somewhere that is should be looking for?

My wife's car has heat from the passenger side vents but not the drivers side or in the back. Any suggestions to try?

The heater in our Acadia works great in the front. The rear blows cold. We have checked and rechecked all from and rear controls. No improvement. How does the rear heater get its heat, same as the front or a different delivery system?

Thanks,
Jerry

Ihad to replace the actuator cost me $78.00 all set