{"nhtsa_id":620132,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-07-18","date":"2001-02-01","document_id":"26061001","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:COOLING SYSTEM","mfr_system":null,"summary":"SUBJECT REGARDING VISCOUS FAN PROCEDURES FOR D7, D7A, AND D7C ENGINES. THIS INFORMATION UPDATES THE FOLLOWING SERVICE PROCEDURES, TEMPERATURE CONTROLLED FAN CHECKING AND TEMPERATURE CONTROLLED FAN REPLACEMENT. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/620132","components":[{"id":"engine","name":"Engine","parent":null},{"id":"cooling-system","name":"Cooling system","parent":"engine"}],"codes":[],"topics":[],"vehicles":[{"make":"VOLVO","model":"VOLVO TRUCK","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":[]}