{"nhtsa_id":606579,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-08-27","date":"1999-04-01","document_id":"990139005","mfr_campaign":null,"replaces":null,"component":"VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM","mfr_system":null,"summary":"A CONDITION MAY EXIST WHERE THE HVAC CONTROL ASSEMBLY DISPLAYS INACCURATE TEMPERATURE SETTING AND / OR EMITS TICK NOISE. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/606579","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":"PARK AVENUE","year_from":1997,"year_to":1999,"match":"exact","vehicle_ids":["1997_buick_park-avenue","1998_buick_park-avenue","1999_buick_park-avenue"]}],"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":[]}