{"nhtsa_id":46422,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1996-04-25","date":"1995-12-01","document_id":"BC0096960102","mfr_campaign":null,"replaces":null,"component":"VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:HEATER CORE","mfr_system":null,"summary":"L SERIES WITH THE DSO SLEEPER OPTION. THE 2 STEEL COOLANT SUPPLY TUBES FOR THE SLEEPER HEATER P/N F4HS-18696-AA & F4HS-18663-BA MAY CORRODE & EVENTUALLY LEAK COOLANT. BEGINNING 11/13/95 A NEW MORE CORROSION RESISANT ZINC/COBALT COATING IS BEING USED ON THESE TUBES TO PREVENT THIS FROM OCCURRING. THE NEW PART #'S ARE F6HS-18696-AA & F6HS-18663-BA.","document":null,"url":"https://open.wenmarpro.com/bulletins/46422","components":[{"id":"visibility","name":"Glass, wipers and mirrors","parent":null},{"id":"hvac","name":"Heating and air conditioning","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"FORD","model":"L SERIES","year_from":1992,"year_to":1996,"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":[]}