F 150 4WD Pickup V8-5.4L CNG VIN M (2001)
Part 2
The manual climate control system heats or cools the vehicle interior depending on the function selector position and the temperature selected. Function
selector position determines heating or cooling and air distribution. The temperature blend control setting determines air temperature.
The manual climate control components are used to:
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select air inlet source (outside or recirculated).
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select blower motor speed.
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select discharge air temperature (temperature blend).
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select discharge air location (defrost, panel, floor).
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select A/C compressor clutch operation.
The climate control assembly has three system controls:
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The A/C heater function selector switch combines a vacuum selector valve with two electrical switches to supply battery positive voltage (B+) to
the A/C clutch circuit and the blower motor control circuit.
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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.
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The blower motor switch controls blower motor speed by adding or bypassing resistors in the heater blower motor switch resistor.
