low down is this, 95 2wd 5.2 dak 150k on the clock. i live in the central valley california so it was 90 by 0800 so i had the a/c on driving to work this morning, went to lunch at noon, started the truck. i hadnt turned off the a/c or changed any settings but when i started my truck air was coming out of the defroster port and foot port only. no matter how much i switched around the buttons no change. Has anyone had a similar issue? any ideas what it could be?

 

Sounds like you have a vacuum leak. Engine vacuum is used to move the blend doors around.