{"nhtsa_id":628856,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-03-21","date":"2002-01-01","document_id":"010139007","mfr_campaign":null,"replaces":null,"component":"VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM","mfr_system":null,"summary":"A CONDITION MAY EXIST WHERE THE CUSTOMER CANNOT CONTROL THE HVAC SYSTEM MODES AND / OR THE TEMPERATURE. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/628856","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":"AVALANCHE","year_from":2002,"year_to":2002,"match":"exact","vehicle_ids":["2002_chevrolet_avalanche"]},{"make":"CHEVROLET","model":"SILVERADO","year_from":1999,"year_to":2002,"match":"exact","vehicle_ids":["1999_chevrolet_silverado","2000_chevrolet_silverado","2001_chevrolet_silverado","2002_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA","year_from":1999,"year_to":2002,"match":"exact","vehicle_ids":["1999_gmc_sierra","2000_gmc_sierra","2001_gmc_sierra","2002_gmc_sierra"]}],"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":[]}