I had a similar problem. Looked up on line and someone posted:
1. Turn the car to "on" but don't start
2. Press the OFF button on the heater two times
3. Turn ignition OFF - wait 30 seconds
4. Turn ignition ON - but don't start
5. Wait 3 - minutes then start vehicle...
Good Luck..
Hope this will reset the computer...
heater control valve is bad on the drivers side.
sounds like you need an A/C programmer
Some 1887 Corvettes came with separate driver and passenger climate controls. The most likely cause is the control system, running a self test will show if the vent doors are operating properly. If the control is ok then the diverter door system is stuck.,
the problem is a part called the air temperature control blend door actuator motor, it is deep inside the dash and the dash must be removed to replace it.
Dissconnect the battery for 1 hour and reconnect, should re-set the flaps!
make sure both knobs are all the way up on red for heat...
A broken blend air door is the most likely cause on a Jeep Grand Cherokee.
There is a differential vane in the AC ductwork that regulates the flow of hot and cold air into the two halves (driver/passenger) of the system. Failure of this mechanism is one of the more notorious problems with the LS.
Temp blend door actuator malfunction.
When my a/c system is low on refrigerant, it blows hot on drivers side, cold on passenger side of the dashboard. This is a 1997 Buick Ultra. Recharging the system solves the problem.
One of the temp blend door actuators has failed.
Had the same problem. In my case it was the actuator motor inside of the panel in the passenger footwell. Check to see if the flap is binding or it is the actuator motor itself.