possibly blower motor some libertys had a recall call your dealer and check also could be the blower motor resistor
hi i like nomey
probably air in the system have you replaced the rad or hoses?
I would look for a Vacuum leak possibly under hood. Does your Cruise control work?
Failed blower resistor. It is located under the dash on the passenger side.
Dead short in the trailer wiring or one of the trailer light sockets.
Either you badly need a refrigerant recharge, or your AC compressor is shot. Or both.
Vent bypasses heater core when open,it is for outside air only...I know this because I just replaced heater core.
Check for vacuum leak either under the hood or under the dash Check the operation of the vacuum actuators Check the selector switch Defrost is the default setting on this system
Either the a/c system is low on freon or the evaporator has an internal restriction....
The blend door actuator may not be working.
The flap that directs sir to the selected vents is jammed or broken...or the switch that controls it is.
The HTR RR switch in a Kia Sedona determines which air vents the air is blown through from the rear heating. When it is pushed in, the lower vents blow hot air, and when it is not pushed, the roof vents blow cold air.