Vehicle report
Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
SB-20-64
FREIGHTLINER: FAN CLUTCH NUTS. ALWAYS USE NEW NYLOC NUTS WHEN INSTALLING THE ENGINE COOLING FAN ON A BORG WARNER (KYSOR) FAN CLUTCH. FAILURE MAY LEAD TO A LOOSE OR LOST FAN, AND DAMAGE TO THE FAN CLUTCH OR TRUCK. *PE
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.