wiring ac fan

[YellwMonky]

I'm in the middle of my electric fan install, but I need a little help. I've decided to use the stock electric fan already in my car, but I don't know exactly how to wire it. I bought an adjustable thermostat and i've decided i want to use that with the electric fan. I know there is a write-up on 240sx.org, but that's for a s14. So....anybody know how to wire up my adjustable thermostat to my ac fan ? I know the red wire on my thermostat goes to the battery, the black goes to a ground, but there is a yellow wire I don't know where to plug in. Anybody know how to do this? Thanks in advance..