{"nhtsa_id":10184869,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2020-12-30","date":"2020-12-29","document_id":"SB54-338","mfr_campaign":null,"replaces":null,"component":"VISIBILITY; EQUIPMENT","mfr_system":null,"summary":"Freightliner Service Bulletin for Front HVAC Evaporator Freezing and Espar Heater Cool Down Algorithm. New Cascadia vehicles with sleeper cabs may become extremely cold when in A/C mode, which can lead to reduced airflow as a result of internal ice buildup at the evaporator. Durability of the Espar D5 heater system when paired with the battery parked HVAC system (BPHS) can be improved by applying \"cool down\" software to the parked control unit (PCU).","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10184869-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10184869-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10184869","components":[{"id":"equipment","name":"Equipment and accessories","parent":null},{"id":"visibility","name":"Glass, wipers and mirrors","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"FREIGHTLINER","model":"CASCADIA","year_from":2017,"year_to":2021,"match":"exact","vehicle_ids":["2017_freightliner_cascadia","2018_freightliner_cascadia","2019_freightliner_cascadia","2020_freightliner_cascadia","2021_freightliner_cascadia"]}],"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":[]}