Yet another defrost only question
I apologize for bringing this issue up again but the previous posts that I have fond are confusing me.
I have a 2004 Grand Cherokee SE with the 6 cylinder engine. It has manual AC controls (not any kind of multi zones or climate control).
Recently the heat, vent and AC starting working from only the defrost vents. I can mix hot and cold air and the AC does chill the air but it will only come out of the defroster vents.
My cruise control does work normally.
Much of what I have read indicates that this might be a vacuum line issue. Some of what I've read indicated that it could only be a vacuum line issue if the cruise was also broken. I have visually inspected all of the hose connections coming from the rear most port on the intake manifold, going across the top of the engine and then running up under the battery platform.
Could this indeed be a vacuum leak if the cruise control still works?
If it could still be a vacuum leak is there a systematic method for determining the location of the leak?
Lastly (and I apologize for the length) the hose fitting that connects to that rear most port on the intake manifold is kind of loose (pulls off easily), how tight should it be and could that be the issue?
Thanks for any answers that you can provide.