I got a reply from Amsterdam mechanic and he said that if the vacu motor doesn't move when you switch modes that this could be the problem. It's under the dash on the heater box and to access it you need to remove the under dash panels on both the driver's & passenger sides. It Ty doesn't move when you turn the control. It it moves in one on the positions, then the vacuum motor is bad. If there is no vacuum at the motor in either position then it's a bad switch at the control head or no vacuum to the switch. I'll look at the hose you pictured me on my Jeep and see if I can figure out where it goes to and I'll get back to you. Keep me posted if you try this fix.
That little hose could be the root of all your problems. If it is by the passenger front headlight, it could be going to your vacuum reserve reservoir, which is under the front passenger headlight. Why don't you go buy a vacuum gauge for $15 and confirm your low vacuum? Then replace ALL the vacuum lines on your 14 year old rig. At this point, that should be a no brainer and can't cost more than $20 to do them all.
It looks like a vacuum hose that has come off.
The beatings will continue until attitudes improve!
I put the screw in it so i could focus on it. That is under the passenger headlight. it does not appear worn, or ripped, if it was connected to anything it was cut from what it looks like.
That line more than likely is supposed to be connected to the vaccum reservoir that should be mounted under the battery/ inner fender well area. If you are not the original owner, this vehicle was more then likely involved in and accident and they removed the vac reservoir and left you hanging....
It was in an accident, but I have had the truck for about 8yrs now. And actually until this problem I have actually had zero problems besides routine maintenance for it .None of they problems started until I took it in for an inspection. The cynical side of me wants to think they did something to it hoping I would come back for repairs.