Air Temperature Actuator

The vehicle operator can determine the air temperature by turning the temperature control, located on the HVAC control assembly, to any setting. The temperature switch can change the vehicle's air temperature regardless of the HVAC mode setting, heater, A/C or OFF. The underhood junction block provides power to the air temperature actuator through the ignition 3 voltage circuit. Power and ground are provided to the HVAC control assembly by the ignition 3 voltage and ground circuits.

When a desired temperature setting is selected, a variable resistor is used to determine the air temperature door control signals value. A variable resistor inside the HVAC control assembly provides a varying ground to the air temperature actuator through the air temperature door control circuit. This changes the 12-volt signal coming into the actuator and varies the voltage so the actuator is moved into the proper position. The motor opens the air temperature actuator to a position to divert sufficient air past the heater core to achieve the desired vehicle temperature. Ground is provided by the ground circuit.