My wife and I own a 05 f250sd and expedition. We are having trouble with the a/c. The air is blowing through the defrost but cools down. To get the air to blow through the vent you have to take it off A/c turn the **** to vent only so the air blows through the vents and then go back to a/c to get it to work. It is doing it on both the trucks. If I turn the truck off and back on it still blows through the vents but if set for a while it starts all over again. I want to think it is a vacuum problem but wanting to check. If it is does anyone have a diagram on these trucks for vacuum lines.

 

See the FAQs above.

Steve

 

All FAQ shows me is how to use the web site. Nothing about my problem

 

The stickied thread titled: 97-03 F150 HVAC FAQS