F 250 4WD Super Duty V10-6.8L VIN Z CNG (2003)
Blower Motor Resistor: Description and Operation
Blower Motor Resistor Coils
Blower Motor Thermal Limiter
The heater blower motor switch resistor has the following features:
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The assembly is located on the evaporator core housing in the engine compartment.
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Three resistance elements are mounted on the resistor board to provide four A/C blower motor speeds.
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Depending on the heater blower motor switch position, series resistance is added or bypassed in the A/C blower motor circuit to decrease or
increase A/C blower motor speed.
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An overheating protective device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F), interrupting the
blower motor operation in all speeds except HI.
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The thermal limiter cannot be reset and is not repairable.
