Having played extensively over the last year or so with fan motors and suffered some consequences as a result, may I suggest this. If you have cut the pin 14 wire on the IRCM, put it back together, and here is why.
These fan motors have true dual windings, one for low speed and one for high speed(unlike say my 87 Taurus which uses 2 fan speeds but the motor only has one winding and 2 wires to it). I can attest most certainly to the fact that these motors do NOT like it when both windings are engaged. When you cut the number 14 wire the low speed is on constantly, when the engine temp hits something like 223 degrees the high speed fan winding kicks in via the EEC and the IRCM. IF the low speed is not turned off(which once the wire is cut it cannot turn off) BOTH windings become engaged. One winding literaly fights the other and you end up with one hell of a HOT set of power lines to the IRCM. Not to mention the high speed RPM is nowhere near what it should be.
Don't ask how I know this, it was a very frustrating hard learned lesson, just trust me on this one.
So unless you have the EEC tuner which can adjust the temps accordingly for the EEC to turn on the fans I would not F around with cutting wires. If you choose to use swithces or temp controls be damned sure the low speed winding is disengaged when the high speed comes on.
Another point here is that when your A/C is on the low speed is engaged up until a certain roadspeed, you cannot overide this and turn it off, so trying to manually fire the high speed will result in the same scenario, HOT power lines to the IRCM, kakked fuses or melt down.
The ONLY thing I do currently is I have a high speed jumper wire that I use at the track only. I keep the AC off of course and she stays nice and cool no matter how hard I beat on her. Gotta get the EEC tuner if for no other reason but that you can adjust the settings as to when the low and hi speed come on.