04 Silverado z71 Heater only no AC
So first off I want to say that I live in Arizona and having no AC here is a serious issue. Basically what is happening is I know my compressor is working however the "doors" which control what vents blow isnít functioning properly. What I get is the heater at all times coming out of the defrosters. I cannot switch it at all. The truck is out of warranty and the dealer is out of the question due to funds. I am fairly competent when it comes to repairs so I would like to tackle this myself.
A little more info about the truck it has the dual climate controls, and the button to change if the air is circulated inside the cab or pulled from the outside still works. So if Iím driving without that on heat consistently comes out but when I push that, when the blower is off, the heat stops coming out and nothing comes out. Any help or advice would be greatly appreciated as the summer months are approaching quickly!!