F 450 4WD Super Duty V8-6.0L DSL Turbo VIN P (2003)
Control Assembly: Description and Operation
Main Climate Control
Manual Climate Control
The climate control assembly has three system controls:
^
The function selector switch combines a vacuum selector valve with two electrical switches to supply battery positive voltage (B+) to the blower
motor control circuit and the A/C clutch circuit (if equipped).
^
The temperature selection is accomplished with a potentiometer connected to the electric blend door actuator that controls positioning of the
temperature blend door. Movement of the control knob from COOL (blue) to WARM (red) causes a corresponding movement on the air
temperature control door and determines the temperature that the system will maintain.
^
The blower motor switch controls blower motor speed by adding or bypassing resistors in the heater blower motor switch resistor.
Electronic Automatic Temperature Control (EATC)
The steering wheel audio/climate control switch:
^
is located on the right side of the steering wheel.
^
allows the driver to adjust the passenger compartment temperature setting and manually override the blower motor speed setting.
For removal and installation of the steering wheel audio/climate control switch, refer to Radio, Stereo, and Compact Disc.
