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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
take off your door panel and check the actuator (the lock motor) and the connection. if the passanger works then swap the two to check if its the switch or the motor