{"nhtsa_id":10085526,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2016-12-05","date":"2013-04-04","document_id":"TSB130055-040413","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":null,"summary":"THIS TECHNICAL SERVICE BULLETIN ADDRESSES TWO FAILURE MODES OF THERMOSTAT FAILURES THAT RESULT IN ENGINES EXPERIENCING EXCESSIVE COOLING OF THE ENGINE COOLANT. THE TWO FAILURE MODES ARE THE THERMOSTAT STUCK/SEIZED IN THE OPEN POSITION AND THERMOSTAT FLANGE SEAL FAILURES; BOTH FAILURES LEAD TO EXCESSIVE COOLING BY ALLOWING FOR CONTINUOUS COOLANT FLOW TO THE RADIATOR. A NEW THERMOSTAT HAS BEEN RELEASED TO ADDRESS BOTH OF THESE FAILURE MODES.","document":null,"url":"https://open.wenmarpro.com/bulletins/10085526","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CUMMINS","model":"ISM 11","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"CUMMINS","model":"ISX","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"CUMMINS","model":"ISX15","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"CUMMINS","model":"L10","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"CUMMINS","model":"M11","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"CUMMINS","model":"SIGNATURE","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":[]}