Heater blowing cold air only on drivers side

- With temperature set to max on HVAC head, middle-level vents blew cold air on drivers side (always) passenger side responded correctly to temperature setting (unit was not in dual mode).

- Reset by disconnecting battery for one hour.

- After re-connection, problem was solved.

- However, upon turning off/on, problem was back immediately.

- Noticed that whenever HVAC was turned on, the A/C clutch became engaged (even though temperature set high and it was cold out).

- Disconnected fuse for A/C clutch, driver side stayed cool (not cold presumably outside air). Temperature setting still had not effect. Passenger side still hot.

- After ten minutes, tried lowering temp from max to min slowly, then raising to max. All of a sudden, hot air out of all vents.

- Is there a driver side thermostat separate from the passenger side? Faulty thermostat? If it were just a faulty driver-side flap actuator that would not explain why the A/C clutch is engaged when it should not be.

Thoughts/suggestions appreciated.