{"nhtsa_id":52568,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1997-08-21","date":"1997-06-01","document_id":"731103","mfr_campaign":null,"replaces":null,"component":"VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM","mfr_system":null,"summary":"AIR TEMPERATURE FROM HVAC OUTLETS DOES NOT CHANGE OR BLOWS COLD (REPLACE TEMPERATURE VALVE DOOR). *TW","document":null,"url":"https://open.wenmarpro.com/bulletins/52568","components":[{"id":"visibility","name":"Glass, wipers and mirrors","parent":null},{"id":"hvac","name":"Heating and air conditioning","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"BUICK","model":"CENTURY","year_from":1997,"year_to":1997,"match":"exact","vehicle_ids":["1997_buick_century"]},{"make":"BUICK","model":"REGAL","year_from":1997,"year_to":1997,"match":"exact","vehicle_ids":["1997_buick_regal"]},{"make":"CHEVROLET","model":"CORVETTE","year_from":1997,"year_to":1997,"match":"exact","vehicle_ids":["1997_chevrolet_corvette"]},{"make":"CHEVROLET","model":"VENTURE","year_from":1997,"year_to":1997,"match":"exact","vehicle_ids":["1997_chevrolet_venture"]},{"make":"OLDSMOBILE","model":"SILHOUETTE","year_from":1997,"year_to":1997,"match":"exact","vehicle_ids":["1997_oldsmobile_silhouette"]},{"make":"PONTIAC","model":"GRAND PRIX","year_from":1997,"year_to":1997,"match":"exact","vehicle_ids":["1997_pontiac_grand-prix"]},{"make":"PONTIAC","model":"TRANS SPORT","year_from":1997,"year_to":1997,"match":"exact","vehicle_ids":["1997_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":[]}