{"nhtsa_id":10143733,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-08-20","date":"2018-05-30","document_id":"18185","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING; EQUIPMENT:APPLIANCE:AIR CONDITIONER","mfr_system":null,"summary":"18185 - Service Update - In certain vehicles, the concentration of dex-cool coolant to water may be too high and may cause degradation of cooling performance. The driver may see a DIC message at 125 degrees Celsius that the air-conditioning is disabled for engine coolant temperature (ECT), and at 128 degrees Celsius, another DIC message is displayed for Engine Overheated Idle Engine. Dealers are to drain specified coolant amount and replace with water.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2018/MC-10143733-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2018/MC-10143733-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10143733","components":[{"id":"engine","name":"Engine","parent":null},{"id":"equipment","name":"Equipment and accessories","parent":null},{"id":"hvac","name":"Heating and air conditioning","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO 2500","year_from":2018,"year_to":2018,"match":"base","vehicle_ids":["2018_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA 3500","year_from":2018,"year_to":2018,"match":"base","vehicle_ids":["2018_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":[]}