{"nhtsa_id":10113174,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-08-15","date":"2013-08-02","document_id":"PIT5221","mfr_campaign":null,"replaces":null,"component":"VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM","mfr_system":null,"summary":"This Preliminary Information communication provides information to the technician about vehicles that intermittently after selecting defrost mode they are unable to manually adjust the blower speed lower. Dealer should communicate to the customer this condition is a normal operating characteristic of their vehicle.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10113174-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10113174-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10113174","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":"SILVERADO 1500","year_from":2014,"year_to":2014,"match":"base","vehicle_ids":["2014_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA 1500","year_from":2014,"year_to":2014,"match":"base","vehicle_ids":["2014_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":[]}