1999 jeep Cherokee air conditioning problem cold air blows with intemtritment warm air blowing out of vents and will sometimes resume blowing cold air while sometimes have to shut ac off and restart?
This is exactly the problem on my 1997 Cherokee. this answer saved me alot of work. the plastic tubing was broken in half under the battery tray. I patched it with rubber tubing for now but will replace all of it soon. Now heat and A/c work like new. Great answer Thanks
All of the venting directional airflow problems are usually vacuum related. the micro lines are made of a PVC not polyV so they can and do tend to break easliy. Check under hood, passenger side, right below the coolant tank, two lines run from there along side top of fender wall, down to behind the passenger side front bumper. (can only be seen from below)Sounds like you might have the beginings of a crack that gets affected while driving. (wind, bumps, g-forces of take off and braking)If cracks or breaks are evident, repair with "wiper/washer hose" (the I.D. is a perfectly tight fit for the O.D. of the micro line) Either just the section affected or the entire line start to finish.