{"nhtsa_id":606519,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-08-26","date":"1999-06-01","document_id":"990232004A","mfr_campaign":null,"replaces":"990232004","component":"STEERING:HYDRAULIC POWER ASSIST:PUMP","mfr_system":null,"summary":"SOME OWNERS / OPERATORS OF MEDIUM DUTY MODELS MAY COMMEND ABOUT WATER ENTERING THE POWER STEERING RESERVOIR AND CONTAMINATING THE POWER STEERING FLUID. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/606519","components":[{"id":"steering","name":"Steering","parent":null},{"id":"power-steering","name":"Power steering","parent":"steering"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"T SERIES","year_from":1997,"year_to":1999,"match":"exact","vehicle_ids":["1997_chevrolet_t-series","1998_chevrolet_t-series","1999_chevrolet_t-series"]},{"make":"GMC","model":"T SERIES","year_from":1997,"year_to":1999,"match":"exact","vehicle_ids":["1997_gmc_t-series","1998_gmc_t-series","1999_gmc_t-series"]}],"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":[]}