F 250 2WD Super Duty V10-6.8L VIN S (1999)
The manual climate control components are used to:
-
select the air inlet source (outside or recirculated).
-
select the blower motor speed.
-
select the discharge air temperature (temperature blend).
-
select the discharge air location (defrost, panel, floor).
-
select the A/C compressor clutch operation.
Control System Inputs
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.