Air Temperature Actuator

When the HVAC system is in the OFF mode, toggling the temperature switch up or down actuates the automatic HVAC system. If the HVAC control module displays any temperature between 19-29°C (66- 84°F), toggling the temperature button changes the set temperature by 1 degree. If the temperature is set at 30°C (85°F), toggling the temperature switch up increases the set temperature to 32°C (90°F).

The IP fuse block provides power to the left and right air temperature actuators through the ignition 3 voltage circuit. Ground is provided by the low reference circuit, the IPM and ground circuit.

The air temperature actuators are electronic stepper motors with feedback potentiometers. Zero volts drives the actuator in one direction while 5 volts moves the actuator in the opposite direction. When the actuator receives 2.5 volts, actuator rotation stops. A 5 volt reference signal is sent out over the 5 volt reference circuit from the IPM to the left air temperature actuator. When you select a desired temperature setting, manually or automatically, the solid state circuit determines the value of the position sensor signals for the left air temperature door. A separate 5 volt reference is sent from the IPM to the solid state circuit. The IPM software uses this reference voltage in order to determine the position of the left air temperature actuator through the position circuit of the air temperature door. The motor opens the air mixture door to a position that will divert sufficient air past the heater core in order to achieve the desired vehicle temperature. The ground circuits and IPM provide ground to the left air temperature actuator.

The right air temperature actuator operates the same as the left side.