2004 grand cherokee overland model heater and air conditioner temperature not working correct has the split controls for driver and passenger temp control, one side will blow cold the other hot, and it is intermittant

the bleand air doors in the hvac system prob broken

Normal reading is around 195 degrees F. Probably needs heater control valve or backflushing of heater core.

it sounds to me like the passenger side control knob needs to be exchanged. This or there should be a relay in the line that is faulty. try wiring the driver's side control to the wires coming into the passenger side control. If this doesn't work, then it may be a computer glitch.

most likely there is a door in the dash somewhere that controls the flow of the air. the actuator that controls the door for that side might be bad

If the heater outlet air temperature cannot be
adjusted with the temperature control knob(s) on the
A/C Heater control panel, the following could require
service:
- The A/C heater control.
-The blend door actuator(s).
-The wire harness circuits for the A/C heater control
or the blend door actuator(s).
-The blend door(s).
- Improper engine coolant temperature

same thing happened to mine at 2 yrs. old , the connecting arm on air mix positioner broke. The whole dash had to come out. Part was cheap but labor was huge. This is not a job for the do-it-yourself.

you need to change drivers side temp door actuator then disconnect battery for 5 seconds and reconnect after changing the part, turn key on for 60 seconds with touching heater control to allow actuator to program and then it will work.

Duct door axle is broken. Dealer will charge $1100 to fix. Go to web site " HeaterTreater.net "
Part will cost around $112. Good luck

look for Main A/C relay, look for fuses, or go to a/c shop and have gas check out, perhaps leaks, perhaps evaporator, perhaps condenser, but start for relay box on front passengers side, or fuses on same side

U will need to replace the pass side air temp control blend door acuator motor.