Ok I know there are threads for vacuum pump problems which I used to solve my problem. Like most the air was only coming out the defroster. Read out wires and power all that checked good. I neve heard the pump come on. So I thought I had figured it out. So I replaced the pump. Afterwards started the truck and air blew out port selected inside of the truck as it shoudl. I was happy..lol. Get up the next morning start the truck head off to work. As I turned the fan back on the air went spewing out thru the defroster again. Im not sure what to do and was curious if any of you guys have any advice.