I'm going to use a Perma Cool fan and was wondering, what's the best way to wire it?
I was thinking about just getting a Painless electric fan relay kit from Jags.

Use a relay and a temp sensor. And wire in a kill switch. :)

I wired mine on an ign hot. Through a switch on the dash to a relay. That way you don't have to worry about shutting them off everytime you kill the engine. :flipoff2: I'm lazy!

So what do i measure the temp off? The intake or the rad? I want it to turn on/off automatically

Depends on the sensor. Both of the ones I have go in the fins.

Originally posted by vova
So what do i measure the temp off? The intake or the rad? I want it to turn on/off automatically

Outlet side of radiator...usually stick the sensor in between the fins as close to the neck as possible. :D

If you get the painless relay, it comes with a temp sensor that goes into a port on the intake manifold. You get a choice of a couple of different on/off temps. Mine works great. Simple to hook up.

I uesd to have a relay and temp sender, my sender was cheesy, it was a copper rod that slid into the radiator between the upper hose and the radiator, It took some time to get it to not leak.
The temp sender died so now i just wach the gauge and flip it on when i see it getting hot.
This works ok, but sometimes it gets real hot before i see it and flick it on

as was stated above
the correct placement for the fan trigger is in the cold side of the rad.
placing it at the engine seems incorrect

Why not put it in the intake next to the thermostat. You don't need the whole painless kit, just the sender and a relay from the auto parts store. Run the ground wire to the sender and then to the relay. When the temp comes up it will ground the relay and turn on the fan. You can use a switched power for the relay so it won't run when the engine is not running.

Those temperature on/off units are pretty cheesy. If I had one of those, I would also add a manual on/off switch too so that I could turn it on whenever I wanted.

Crowdog