From DsmWiki

Here is how to add an engine cooling fans override switch for the 2g using just 1 switch and 3 wires - all done under the dash. The original fan relays are used and nothing is changed in the engine compartment. Since I already have this mod listed in a dsmtuners thread and the pictures are there, I will just provide a link to it. It is post #11 of "Cooling issue, plus wiring them up" in the Problem Diagnosis forum. Here is the link (click on the [1]): [[1]].DSMwiki Index