Air Temperature Actuators

When the HVAC system is in the OFF mode, pressing any HVAC switch will activate the automatic HVAC system. The left and right air temperature actuators operate in the same manner. The air temperature actuators are reverse polarity motors, each circuit provides both power and ground to the air temperature actuators. When the actuator is being held in a stationary position, both of the air temperature door control circuits have 12 volts applied to both sides of the actuator motor. This holds the actuator stationary. When a cool temperature is requested, one of the air temperature door control circuits will ground driving the air temperature actuator into the desired temperature mode. When a warmer temperature is requested, the other air temperature door control circuit will ground. This moves the air temperature actuator into a new position.