{"nhtsa_id":618081,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-04-03","date":"2001-01-01","document_id":"000138003A","mfr_campaign":null,"replaces":"000138003","component":"VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM","mfr_system":null,"summary":"VEHICLES MAY EXPERIENCE POPPING SOUND HEARD UNDERNEATH INSTRUMENT PANEL WHEN SWITCHING FROM DEFROST TO HEAT OR FROM A/C TO DEFROST. *JB","document":null,"url":"https://open.wenmarpro.com/bulletins/618081","components":[{"id":"visibility","name":"Glass, wipers and mirrors","parent":null},{"id":"hvac","name":"Heating and air conditioning","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"IMPALA","year_from":2000,"year_to":2000,"match":"exact","vehicle_ids":["2000_chevrolet_impala"]},{"make":"CHEVROLET","model":"MONTE CARLO","year_from":2000,"year_to":2000,"match":"exact","vehicle_ids":["2000_chevrolet_monte-carlo"]}],"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":[]}