What was found
(CAN) AFTER ACFT STARTUP AND ENVIRONMENTAL ON, THE PILOTS REPORTED THAT THERE WAS VISIBLE SMOKE IN THE CABIN OF THE ACFT. THE ACFT WAS SHUTDOWN, PASSENGERS EVACUATED AND THE CABIN DOOR WAS OPENED TO VENTILATE THE ACFT. UPON INSPECTION BY MAINTENANCE PERSONAL THE AFT EVAPORATOR BLOWER MOTOR, PN 300-0261-1, FWD POSITION WAS FOUND SEIZED. MAINTENANCE R & R THE EVAPORATOR BLOWER MOTOR WITH A SERVICEABLE UNIT AND THE ACFT WAS RETURNED TO SERVICE.