{"nhtsa_id":618163,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-04-06","date":"2001-01-08","document_id":"080101","mfr_campaign":null,"replaces":null,"component":"VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM","mfr_system":null,"summary":"SOME CUSTOMER MAY COMMENT THAT THE WINDOWS DO NOT DEFROST ON A TIMELY BASIS. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/618163","components":[{"id":"visibility","name":"Glass, wipers and mirrors","parent":null},{"id":"hvac","name":"Heating and air conditioning","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SIERRA","year_from":1999,"year_to":2001,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"SILVERADO","year_from":1999,"year_to":2001,"match":"exact","vehicle_ids":["1999_chevrolet_silverado","2000_chevrolet_silverado","2001_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA","year_from":1999,"year_to":2001,"match":"exact","vehicle_ids":["1999_gmc_sierra","2000_gmc_sierra","2001_gmc_sierra"]},{"make":"GMC","model":"SILVERADO","year_from":1999,"year_to":2001,"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":[]}