System Operates Only at Maximum Heat

1. Set for "65." If system switches to cool, proceed to a. If malfunction occurs, refer to "Diagnosis, Temperature Door Actuator."
a. Check for open sensor circuit (disconnected in-car sensor, disconnected ambient temperature sensor, broken or disconnected sensor wiring).
b. Check for installation of incorrect sensor, or sensor malfunction (refer to "Diagnosis, Sensor").
c. If no sensor problems are found, refer to Diagnosis, Temperature Door Actuator.