I want to add a switch so I can turn my fans on and off @ will..

But I looked and couldnt find a relay and traced the wire to the firewall were it joins a big loom..

So who has done it and how do i do it ? Is it ecu controlled or ??

 

Its VERY simple, this method though will work only if your fan relay is good.

Get any switch, mine was $3 at ace hardware, and some 16 gauge wire, $2 for about 30ft at autozone.
Look on the back of your block for the CTS (collant temp switch) it will have 2 wires coming from it. Up and to the left of your oil filter.
Take a length of wire and jus wrap it around your "-" battery terminal, undo the 2 connectors, and turn ignition to stage 2(just before you start it) Stick the other end of the wire into the connectors, find out which one activates the fan, this is the wire you will need to splice into.
Unhook the wire from the battery, turn ignition off, and take wire strippers and jus cut away some of the insulation, dont cut off the plug unless you dont want to keep the stock function.
Splice in the wire and wrap w elec tape, solder, shrink wrap whatever you prefer. I jus swrapped mine around the exposed wire and taped, works fine.
Run the wire into your cabin and to the switch.
Ground the other end of the switch or run it back to the "-" battery terminal.
Put ingition to stage 2 again and test switch.

It sounds like a lot but I was trying to be as detailed as possible, plus credit goes to 4dref as he was the one who explained it to me.
Also if your looking for a place to mount the switch and arent good at fabrication, look below the left side AC vent, below the slider bar, there shoudl be a panel you can pop off. Behind it is a metal bracket with 2 square holes in it, I just dremeled then so one was rounded for my switch, fit perfect and isnt too obvious. Good luck.