{"nhtsa_id":634218,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-09-28","date":"2002-04-01","document_id":"990602012D","mfr_campaign":null,"replaces":"990602012C","component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"SUBJECT REGARDING RUST IN COOLING SYSTEM, HEATER INOPERATIVE, BLOWS COLD AIR, ENGINE OVERHEATS (FLUSH COOLING SYSTEM). NLM","document":null,"url":"https://open.wenmarpro.com/bulletins/634218","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"BLAZER","year_from":1996,"year_to":2000,"match":"exact","vehicle_ids":["1996_chevrolet_blazer","1997_chevrolet_blazer","1998_chevrolet_blazer","1999_chevrolet_blazer","2000_chevrolet_blazer"]},{"make":"CHEVROLET","model":"S10","year_from":1996,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"ENVOY","year_from":1998,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"JIMMY","year_from":1996,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"SONOMA","year_from":1996,"year_to":2000,"match":"exact","vehicle_ids":["1996_gmc_sonoma","1997_gmc_sonoma","1998_gmc_sonoma","1999_gmc_sonoma","2000_gmc_sonoma"]},{"make":"OLDSMOBILE","model":"BRAVADA","year_from":1996,"year_to":2000,"match":"exact","vehicle_ids":["1996_oldsmobile_bravada","1997_oldsmobile_bravada","1998_oldsmobile_bravada","1999_oldsmobile_bravada","2000_oldsmobile_bravada"]}],"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":[]}