Originally Posted by pmillz09
Since I finally fixed my engine issues now it's time to work on this problem. Randomly 1 day about 3 months ago my heater and ac decided to stop working. Not entirely stop but it has to be on max blower and no matter what setting you have for which vents it only blows from the front vents. Makes it take a long time defrost the windshield in the morning. Has anyone had this problem or know what to look at? I'm dumbfounded on this one...
The system runs on vacuum to start off, just to get you an idea of where I am going with this. You have small vacuum lines w/ a "check valve" that runs from your intake manifold into the cab and this is what and how the sub-assembly works on. You can start by checking there at the lines in the engine bay, and see if they are disconnected or rotted away. Some lines with can be disconnected or clogged up inside the cab behind the dash, where the blend door may sometimes starts to act up and cause issues like the one you have now.