2003 Jeep Liberty Heat Issue

blower motor resistor is typically if your climate control fan only runs one speed, or doesnt run at all, regardless of what setting you put it on.

You may have a blend door stuck or other "ductwork" issue where the air is simply not being routed to the heater and instead runs over the AC side all the time.

Easy way to tell is if you turn the knob to hot, and turn the AC button on at the same time. If the door is stuck, it will try to switch to hot side, but will stay cold or get colder as the ac system cools down.

Another possibility is plugged heater core, and if this is the case, the only options are flush out and if that doesn't work, replacement.

/r/JeepLiberty Thread