{"nhtsa_id":10248330,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2024-01-05","date":"2023-12-18","document_id":"42-062","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"Certain W900 Mahle radiator assemblies were built with closed upper vent ports. This closed port can result in slow deaeration of coolant leading to trapped air in the cooling system. Trapped air can cause higher than normal engine operating temperatures. This has the potential to cause a warning light on the dash.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10248330-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10248330-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10248330","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"KENWORTH","model":"W990","year_from":2023,"year_to":2023,"match":"exact","vehicle_ids":["2023_kenworth_w990"]}],"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":[]}