{"nhtsa_id":10110929,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-08-10","date":"2017-03-14","document_id":"5NP-D4B5F-04","mfr_campaign":null,"replaces":null,"component":"EQUIPMENT:ELECTRICAL; EQUIPMENT:APPLIANCE:AIR CONDITIONER","mfr_system":null,"summary":"Some Sonata (YF) vehicles may develop a condition with the separator plate in the middle of the heater box (Heater & Evaporator Assembly) becoming warped and may cause interference against one or more of the internal flaps that control air flow to the vents. This condition may result in HVAC system exhibiting abnormal noise from the heater box, difficulty to control the vented temperature, blocked airflow due to improper mode control, and/or airflow stuck in defrost mode.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2017/MC-10110929-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2017/MC-10110929-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10110929","components":[{"id":"equipment","name":"Equipment and accessories","parent":null},{"id":"hvac","name":"Heating and air conditioning","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"HYUNDAI","model":"SONATA","year_from":2011,"year_to":2014,"match":"exact","vehicle_ids":["2011_hyundai_sonata","2012_hyundai_sonata","2013_hyundai_sonata","2014_hyundai_sonata"]}],"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":[]}