{"nhtsa_id":634989,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-10-11","date":"2002-04-01","document_id":"000138011A","mfr_campaign":null,"replaces":"000138011","component":"VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM","mfr_system":null,"summary":"SUBJECT REGARDING POOR HEAT WITH COLD OUTSIDE TEMPERATURES AT LOW ENGINE RPM. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/634989","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":"VENTURE","year_from":1997,"year_to":1999,"match":"exact","vehicle_ids":["1997_chevrolet_venture","1998_chevrolet_venture","1999_chevrolet_venture"]},{"make":"OLDSMOBILE","model":"SILHOUETTE","year_from":1997,"year_to":1999,"match":"exact","vehicle_ids":["1997_oldsmobile_silhouette","1998_oldsmobile_silhouette","1999_oldsmobile_silhouette"]},{"make":"PONTIAC","model":"MONTANA","year_from":1999,"year_to":1999,"match":"exact","vehicle_ids":["1999_pontiac_montana"]},{"make":"PONTIAC","model":"TRANS SPORT","year_from":1997,"year_to":1998,"match":"exact","vehicle_ids":["1997_pontiac_trans-sport","1998_pontiac_trans-sport"]},{"make":"PONTIAC","model":"TRANS SPORT","year_from":1999,"year_to":1999,"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":[]}