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A humming noise from behind the dash of a 2001 Saab 9-3 could be caused by a malfunctioning blower motor, which may be struggling to operate due to wear or debris obstructing it. Additionally, a failing actuator or a problem with the climate control system could produce similar sounds. Electrical issues, such as a loose connection or a failing component, might also contribute to the noise. It's advisable to have a mechanic inspect the vehicle to diagnose the exact source of the issue.

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