Service Update
Chevrolet technical service bulletin 18185 for 2018 Chevrolet Silverado 2500 and 2018 GMC Sierra 3500.
- Bulletin number
- 18185
- Component
- Equipment: appliance: air conditioner
- 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.
Vehicles covered
- Chevrolet Silverado 2500 2018 2018
- GMC Sierra 3500 2018 2018
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