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I would not trust an in-cabin switch for fan operation. All you'd need to do is forget to operate the fan, just once, and *BOOM* overheated engine.
You would do well to leave fan operation to your car's electronics, and get a larger fan. You'd also want to construct a fan shroud to make your fan more efficient.
I've done this modification to my truck, a 2000 Dodge Dakota Quad Cab, and I am going to do this to my newest acquisition, a 2001 Dodge Durango. It currently is sitting in my garage, slowly being put back together after I swapped in a replacement engine.
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