Check for good fuel pressure on the Wrangler. Seven months of sitting could cause fuel to gel in the filter or pump.
you probabally have a vacuum hose disconnected
rear wiper, rear defrost
Your air mix door is stuck or broken.
It's a vacuum leak somewhere in the system. There are several vacuum lines that operate the blend doors on the system. If there is a leak where the system will not hold vacuum, it will default to defrost automatically.
(H)eated (B)ack (L)ight. Its for a rear defrost for those hard-tops that have them.
Check for a vacuum leak either under the hood or under the dashCheck the vacuum actuators under the dashCheck the selector control Defrost is the default for this system
Check that the linkage that controls the damper is connected and working. The linkage is just above the gas pedal.
you have a vacuum line disconnected under the hood. The connections is on the drivers side of the motor right below the fuel injector rail.
Check for a vacuum leak either under hood or under dash Check the operation of the vacuum actuators under dash Check the operation of the selector switch Defrost is the default settting for this system
Your blend door is giving you trouble, it is not switching from defrost to heat or vent
Vacuum leak or bad vacuum motor under dash
well, i had this problem wasnt on a wrangler, but it was on a 92 Cherokee sport. anyways... after pulling my hair out for hours it was a simple...IT was the rear defrost fuse. Why that one?... i dunno, but i caused an electrical problem w/ my starter