Originally Posted by idahospudjeep
We checked by the gas pedal and everything checks out there. In the engine compartment where the line goes under the battery we found that line to not be connected to anything and not rotten or any leaks at all. It just looks like it slipped off from some where and we don't have a clue where it goes. I will try to google some answers but if you know then that would be great also.
your post was a big help.
YW. So is the vacuum line you found under the battery box just open with no plug or anything in it? If so that might be your problem. It should have a short rubber line, remove the battery tray, there's a plastic nipple on the very bottom of the tray, and plug it in. That may fix it if line is open and causing little vacuum getting to your HVAC circulation switch.