{"nhtsa_id":621727,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-10-01","date":"2001-06-12","document_id":"PI540","mfr_campaign":null,"replaces":"PI540","component":"VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM","mfr_system":null,"summary":"SOME MODEL CHASSIS, EQUIPPED WITH BERGSTROM HVAC UNITS, MAY EXHIBIT BROKEN HEATER BLOWER MOTOR MOUNTING TABS IN SERVICE, RESULTING IN THE MOTOR COMING LOOSE. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/621727","components":[{"id":"visibility","name":"Glass, wipers and mirrors","parent":null},{"id":"hvac","name":"Heating and air conditioning","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MACK","model":"CH","year_from":null,"year_to":null,"match":"exact","vehicle_ids":[]},{"make":"MACK","model":"CV","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"MACK","model":"CX","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]}],"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":[]}