check the blend door acutuator and all the vac lines on the heater controls. i think yo will find your problem there.

 

I'll try. I have no ideas where or how to get to those items to even check. If I take the center cosmos cover off and remove the heater/ac controls, there are wires but no vacuum lines. So where do I check those?

 

If someone has a moment please post up where the blend door i located. I can't for the life of me remember off hand. Take a pic or something and point it out.

I am with the above user and curious about he vacuum lines on the heater controls? I know under the hood you have a heater control valve that is vaccum controlled but hte incabin controls as far as I know for temp are not vaccum controlled. I know the blend door regulates whether the air comes from the ac or heater. Maybe someone can educate the members on the heating system??