Mine has been blowing cold air since replacing the heater core temperature sensor and the fuse box.
At the time it had the following faults logged:
(22) THE RIGHT RECIRCULATION DOOR MOTOR IS SHORT CIRCUIT TO POSITIVE 12V.
(50) HEATER CORE TEMPERATURE SENSOR CIRCUIT SHORT TO GROUND.
(55) DISTRIBUTION DOOR MOTOR STALLED DURING SELF CALIBRATION.

After I cleared the faults using the FaultMate, it recently logged another fault:
(22) THE RIGHT RECIRCULATION DOOR MOTOR IS SHORT CIRCUIT TO POSITIVE 12V.

Funny, it seems to be the LHS recirculation flap that isn't closing... maybe I need to check that the RHS one is actually opening