seafoamgreeneagle

i got a problem with the A/C. I have had my jeep for a while now and the other day the way it was sending the air out of the a/c through the vent started acting funny. It switches from car circulation out of the front vents to the defrost without me changing the a/c switch. I thought that it might be a short but, i could be wrong, i believe it would have been happening the whole time i have had the jeep. Any ideas as to what the problem could be?

AppXJ

Does it happen just randomly or only when the engine is under a load like going up a hill?

coyote121403

Read my thread. Some guys gave some good info that got mine working. https://www.cherokeeforum.com/f2/very-odd-problem-fuel-19686/

xj4life2

The defrost vent is the default on the cherokee, what you have is a vacuum bleed off that is switching the blend doors for you.I just fought the same issue myself its a real pain the .....

littleblueman

x2 on the vacuum leak. Check over your vacuum lines and the vacuum reservoir under the passenger side front bumper for breaks or leaks. Also you can check the vacuum line connections on the back of the ac/heater controls in the dash for loose connections

seafoamgreeneagle

Thanks by the way see i didn't pay any attention when i replaced my bumper and removed that unit and just let the line hang but now that i know what that is i will find a way to mount it to my new front bumper thank you a lot....