{"nhtsa_id":617620,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-03-19","date":"2000-10-31","document_id":"00070","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES","mfr_system":null,"summary":"GENERAL MOTORS HAS DECIDED THAT A DEFECT WHICH RELATES TO MOTOR VEHICLE SAFETY EXISTS IN CERTAIN MEDIUM DUTY VEHICLES. SOME OF THESE VEHICLES EXHIBIT A CONDITION IN WHICH TRANSMISSION FLUID MAY LEAK FROM A HEAT DEGRADED TRANSMISSION FLUID COOLER HOSE ONTO THE EXHAUST SYSTEM ON THE PASSENGER'S SIDE OF THE VEHICLE. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/617620","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"B7","year_from":1999,"year_to":2000,"match":"exact","vehicle_ids":["1999_chevrolet_b7","2000_chevrolet_b7"]},{"make":"CHEVROLET","model":"C6500","year_from":1999,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"C7500","year_from":1999,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"B7","year_from":1999,"year_to":2000,"match":"exact","vehicle_ids":["1999_gmc_b7","2000_gmc_b7"]},{"make":"GMC","model":"C6500","year_from":1999,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"C7500","year_from":1999,"year_to":2000,"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":[]}