{"nhtsa_id":10036727,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2011-04-11","date":"2011-08-01","document_id":"SF-421-F-K REV","mfr_campaign":null,"replaces":"SF-421F-M REV2","component":"UNKNOWN OR OTHER","mfr_system":null,"summary":"FREIGHTLINER: IITIATING FIELD SERVICE CAMPAIGN TO MODIFY THE VEHICLES MENTIONED. CERTAIN TRUCKS WITH EARLY PRODUCTION PARKSMART PARKED HVAC UNITS MAY NOT PERFORM OPTIMALLY UNDER ALL CONDITIONS. A RANGE OF UPDATES TO ENHANCE PARKED HVAC PERFORMANCE HAVE BEEN IMPLEMENTED SINCE THE START OF PARKSMART PRODUCTION. *PE UPDATED 10/3/11. *PE","document":null,"url":"https://open.wenmarpro.com/bulletins/10036727","components":[],"codes":[],"topics":[],"vehicles":[{"make":"FREIGHTLINER","model":"CASCADIA","year_from":2008,"year_to":2010,"match":"exact","vehicle_ids":["2008_freightliner_cascadia","2009_freightliner_cascadia","2010_freightliner_cascadia"]}],"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":[]}