Mechanical or electric fan

[Tx_operator87]

This might be a dumb question, but how do I tell if my fan is electric or mechanical? Looking into aFe magnum force cold air intake and there's an option on them for electric fan or mechanical. 

[lawnboy-5247]

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.

[SILVER SLED]

If the fan is driven by a belt, it's usually considered mechanical.  If the fan is secured to the radiator and driven by an unseen electric motor, it's considered electric. 

[SierraHD17]

Hd's all have mechanical fans, 6 liter or diesel alike.  The fleet only 3500 Suburban which uses the same 6 liter as the trucks has E fans though