Expedition 4WD V8-4.6L SOHC VIN W (1999)
Blower Motor Resistor: Description and Operation
The heater blower motor switch resistor has the following features:
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The assembly is located on the passenger side of the plenum assembly behind the glove 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 serviceable.
