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Sure, you could do that. Easiest would be to locate the relay (there should be a high and low speed relay in the back of the fusebox, I believe).
The low speed relay is normally triggered by the AC high pressure switch, the high speed relay is triggered by an engine temperature switch, so the fan runs in low speed if the AC pressure gets too high, and the high speed will come on only if the engine is getting very hot, usually it's on over 200 degrees or so. If you wanted high speed fan on a switch, you might also get this by messing with the temp sensor wiring, not sure if it woudl affect anthing else or not, can't think of anything, maybe the gauge, but that might be a seperate sensor.
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