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well you cant without something to plug into your computer, not that i know of anyway. of course you could wire the thing to come on all the time, but you dont want to do that
That is the setup I have.
Just a plain old toggle switch to ground the fan relays.
Vic
I also have this. Doesn't do much when at speed or with a/c on (because both fans are on already). But when sitting in traffic and it's not a/c weather, it helps a lot. If the temp is sitting at 220 (second fan doesn't come on till 228) and I hit the switch the temp drop to 195-200. Also good when at the track.