00 ITR with no a/c.

What I'd like to do is wire the remaining radiator fan to come on when I hit the a/c button on the dash (which is obviously doing nothing now).

Anyone tried something like this? I'm sure if I dig through my Helms I might be able to find the hot wire for the button and put it inline with the fan, but I was hoping someone could make my task a lot easier by having already done this or telling me at least what color the wires are that I'll need.

Thanks.