Why dont you just glue a piece of plastic over the fan grill. Just use a couple dots of something like hot glue so that it can be removed fairly easy. You could possibly even do a couple little spacers under it so the fan can actually suck some amount of air....?
Losi 8T 1.0, Savage Flux - XL style, LST XXL, Muggy, 3.3 E-Revo Conversion and sitting outside 425hp, 831 Tq Dodge Ram Turbo Diesel. It SMOKES