{"nhtsa_id":10033166,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2010-07-21","date":"2009-12-01","document_id":"SB-20-13","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE:DIESEL","mfr_system":null,"summary":"FREIGHTLINER: BREATHER TUBE FREEZING ON CUMMINS ISB ENGINES. SOME WALK IN VAN CHASSIS EQUIPPED WITH A CUMMINS ISB07 ENGINE AND OPERATE IN EXTREME COLD WEATHER CONDITIONS HAVE EXPERIENCED ICE FORMING WHERE THE BREATHER TUBE CONNECTS NEAR THE TURBO. INSTALLATION OF A WINTER FRONT CAN CONSERVE ENGINE COMPARTMENT HEAT AND HELP ELIMINATE THIS ISSUE. NO MODEL YEAR LISTED. *PE","document":null,"url":"https://open.wenmarpro.com/bulletins/10033166","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"FREIGHTLINER","model":"WALK-IN VAN","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":[]}