System: heater; water; defroster; hose; duct; air.vehicle description: school and transit buses equipped with "red dot heaters."note: if your vehicle IS presented to an authorized dealer on an agreed upon service date and the remedy IS not provided free of charge within a reasonable time, contact thomas built at 1-910-889-4871. Also contact the national highway traffic safety administration's auto safety hotline at 1-800-424-9393.