{"nhtsa_id":10225280,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-10-31","date":"2022-08-16","document_id":"0804322REVC","mfr_campaign":null,"replaces":null,"component":"VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM","mfr_system":null,"summary":"Flash: Heating Ventilation and Air Conditioning (HVAC) Updates This bulletin involves reprogramming the HVAC module with the latest available software. Customers may experience the following: During a remote start, the heated wheel, seat, mirrors and/or the Electric Back Light (EBL) may not turn on. High pitch whistle coming from the dash when the blower motor is turned on.High pitch whistle originated from the defroster door when the HVAC unit in either Hi-Level (panel and defrost) or Bi-Level (panel and floor) modes. May be worsened when running the front airflow at blower bar1-2 and rear airflow at blower bar 5-7","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10225280-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10225280-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10225280","components":[{"id":"visibility","name":"Glass, wipers and mirrors","parent":null},{"id":"hvac","name":"Heating and air conditioning","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"JEEP","model":"GRAND CHEROKEE","year_from":2021,"year_to":2021,"match":"exact","vehicle_ids":["2021_jeep_grand-cherokee"]}],"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":[]}