{"nhtsa_id":604644,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-05-07","date":"1999-02-26","document_id":"AC00299","mfr_campaign":null,"replaces":null,"component":"VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM","mfr_system":null,"summary":"PRODUCTION CHANGES TO THE COWL TOP LOUVER AND HEATER UNIT HAVE BEEN MADE TO IMPROVE RESISTANCE TO SNOW ENTRY INTO THE HEATER UNIT AND IMPROVE DURABILITY OF AIR MIX DOOR ON VEHICLES WITHIN CERTAIN VIN RANGES. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/604644","components":[{"id":"visibility","name":"Glass, wipers and mirrors","parent":null},{"id":"hvac","name":"Heating and air conditioning","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"TOYOTA","model":"4 RUNNER","year_from":1996,"year_to":1998,"match":"exact","vehicle_ids":["1996_toyota_4runner","1997_toyota_4runner","1998_toyota_4runner"]},{"make":"TOYOTA","model":"TACOMA","year_from":1996,"year_to":1998,"match":"exact","vehicle_ids":["1996_toyota_tacoma","1997_toyota_tacoma","1998_toyota_tacoma"]}],"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":[]}