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Mechanical or electric fan


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As far as I know all 2014+ Sierras and Silverados 1500s have electric fans, I believe the 2500s and 3500s with gas engines also have electric fans. I think the only trucks with mechanical fans still are 2500s and 3500s with Duramax diesels. As far as telling by looking a mechanical fan will  have a pulley and run off the engine accessory belt electric fans will be mounted to the radiator and have no direct connection with the engine.

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