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Sounds like the fan clutch bearing is locked up. Running in direct drive will affect MPG drastically. Its a 2006 so its time to replace it. See if the fan blade will spin by hand with the engine off or if excessive wobble is present at the bearing.
it sounds like the new switch has a different pin out or you got it wired wrong? is the motor jamed up, will it turn by hand,,,the humming sound you here is curent running through the motor windings,, if it cant turn its going to get very hot,, it could burn the motor out,, have another look at the wiring
does the fan wobble at high speed? if so change the order of the blades to try & balance it.i.e. number the blades on a piece of tape on each--switch blade # 1 & #3-better or worse? 2&5;better or worse?etc. untill it runs smoothest.
check your grounds and all other connections. remote wiring has to be precise. somes times not for the do it your selfer. all the labor youve encountered somes the cheap can turn out to be very expensive.
18 gauge is a little light... should use 14. Are you sure it is a hum, or is it possibly the fan resonating due to imbalance of the blades. Watch to see if the fan is oscillating when it runs. Also, does changing the speed affect the frequency of the hum. If this is the case, you have to balance the blades using metal shims.
There's a rubber circle that is the damper between the blades and the motor shaft that rotates. The circle has spokes connecting the outer ring, which the blades screw into, to the inner ring which attaches to the shaft and holds it. If the spokes break you get the symptoms you describe, motor hums but no rotation, but blades can turn manually if you hand turn them them. If this is the case you need to remove and replace the blade mounting ring/damper. (About 25 bucks online)