{"nhtsa_id":10020427,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2006-10-02","date":"2006-11-01","document_id":"132","mfr_campaign":null,"replaces":"132","component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"PRESSURE RELIEF VALVE FOR AIR SYSTEMS IN VERY COLD CONDITIONS. MODELS CONSTELLATION. WESTERN STAR. *KB","document":null,"url":"https://open.wenmarpro.com/bulletins/10020427","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"UNKNOWN","model":"UNKNOWN","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":[]}