{"nhtsa_id":10051968,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2013-04-24","date":"2013-02-01","document_id":"SB-20-19","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN","mfr_system":null,"summary":"WESTERN STAR: KYSOR FAN CLUTCH ROCKING RUN OUT INSPECTION. MODELS CONSTELLATION, HERITAGE, 4700, 4800, 4900, 6900. MODEL YEARS UNKNOWN. *KB","document":null,"url":"https://open.wenmarpro.com/bulletins/10051968","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":"WESTERN STAR","model":"WESTERN STAR","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":[]}