{"nhtsa_id":10055455,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2014-05-28","date":"2014-03-21","document_id":"TIB-42-051","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN","mfr_system":null,"summary":"KENWORTH: DURING COLD WEATHER CONDITIONS, ENGINES ARE BEING OVER COOLED WITH TWO (2) SPEED HORTON FAN AND TO KEEP ENGINE FROM REACHING NORMAL OPERATING TEMPERATURES, SOME TIMES JUST ENOUGH AIR IS MOVED ACROSS RADIATOR. *PE","document":null,"url":"https://open.wenmarpro.com/bulletins/10055455","components":[{"id":"engine","name":"Engine","parent":null},{"id":"cooling-fan","name":"Cooling fan","parent":"engine"},{"id":"cooling-system","name":"Cooling system","parent":"engine"}],"codes":[],"topics":[],"vehicles":[{"make":"KENWORTH","model":"KENWORTH","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}