{"nhtsa_id":602403,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1998-11-03","date":"1998-06-01","document_id":"981004","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"SUBJECT REGARDING AD-9DI AND AD-IP AIR DRYER PURGE VALVE UPGRADE FOR VEHICLES MANUFACTURED FROM 10/7/96 THROUGH 11/14/97, AND VEHICLES MANUFACTURED 1/1/95 THROUGH 11/14/97. YC","document":null,"url":"https://open.wenmarpro.com/bulletins/602403","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"FREIGHTLINER","model":"FREIGHTLINER","year_from":null,"year_to":null,"match":"exact","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":[]}