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The blower fan on your expedition stays with the engine off?

No, a properly functioning blower fan on a Ford Expedition (or any other vehicle) should not stay on with the engine off. The fan is powered by the vehicle's electrical system, and that system is shut off when the engine is off. If the fan remains on after the engine is turned off, there's a problem with the vehicle's electrical system, likely a short circuit or a malfunctioning blower motor resistor or control module.