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?
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.
I would look for a Vacuum leak possibly under hood. Does your Cruise control work?
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 heat blows out the defrost when it should blow out floor vents only