C 3500 HD Truck 2WD V8-6.5L DSL Turbo VIN F (2001)
Air Door Actuator / Motor: Description and Operation
AIR TEMPERATURE ACTUATOR
When a desired temperature setting is selected, a variable resistor is used to determine the air temperature actuator position signals value. The resistor
changes the 12-volt signal coming into the actuator and varies the voltage to move the actuator into the proper position, based on the signal from the
HVAC control assembly. 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.
The instrument panel fuse 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.
