{"nhtsa_id":609596,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2000-04-04","date":"1998-08-01","document_id":"831220","mfr_campaign":null,"replaces":null,"component":"EQUIPMENT:APPLIANCE:AIR CONDITIONER","mfr_system":null,"summary":"A/C COMPRESSOR CLUTCH IS ENGAGED. THIS CONDITION IS MOST NOTICEABLE WHEN ENGINE IS AROUND THE 1000-2000 RPM RANGE. THE NOISE MAY BE LODEST WHEN THE ENGINE IS UNDER LIGHT ACCELERATION THROUGH THIS RPM RANGE. THE MOAN NOISE MAY BE CREATED BY COMPRESSOR PULSES WHICH SET UP A SYSTEM RESONANCE BETWEEN THE COMPRESSOR AND THE IN-LINE MUFFLER.","document":null,"url":"https://open.wenmarpro.com/bulletins/609596","components":[{"id":"equipment","name":"Equipment and accessories","parent":null},{"id":"hvac","name":"Heating and air conditioning","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"VENTURE","year_from":1997,"year_to":1998,"match":"exact","vehicle_ids":["1997_chevrolet_venture","1998_chevrolet_venture"]},{"make":"OLDSMOBILE","model":"SILHOUETTE","year_from":1997,"year_to":1998,"match":"exact","vehicle_ids":["1997_oldsmobile_silhouette","1998_oldsmobile_silhouette"]},{"make":"PONTIAC","model":"TRANS SPORT","year_from":1997,"year_to":1998,"match":"exact","vehicle_ids":["1997_pontiac_trans-sport","1998_pontiac_trans-sport"]}],"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":[]}