{"nhtsa_id":10055176,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2014-04-18","date":"2014-02-01","document_id":"FSB-263-039-01","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN","mfr_system":null,"summary":"MACK TRUCKS: THE HDMS COOL LOGIC ENGINE COOLING FAN DRIVE IS LEAKING FLUID FROM REAR DRIVE AND HDMS FAN DRIVE WAS REDESIGNED, DUE TO LEAKAGE, TO IMPROVE SEALING AND OVERALL DURABILITY OF DRIVE. MODEL 2013 CHU, CXU, GU, TD. *PE","document":null,"url":"https://open.wenmarpro.com/bulletins/10055176","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":"MACK","model":"CHU","year_from":2013,"year_to":2013,"match":null,"vehicle_ids":[]},{"make":"MACK","model":"GRANITE (GU)","year_from":2013,"year_to":2013,"match":null,"vehicle_ids":[]},{"make":"MACK","model":"PINNACLE (CXU)","year_from":2013,"year_to":2013,"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":[]}