For what is this connector

[Dino86]

fax0815 Wrote:I´m getting confused, does your switch open or close at a certain temperature?
My old KE35 had a factory electric fan on a bimetal switch that opend the circut at hot temperatures and that was on a relais, in short switch opens, fan starts running (fan loom on a ignition positive).

Isn´t that the same what you´re trying to replicate?
But surely a NC relais won´t help... So you need a reverse trigger NO relais, or whatever it is called...

There is only one thing to do to keep is simple, run a NO relais (which could have the power on a permanent life or ignition life) on a termoswitch that closes the triggercircut at a certain temperature (should be loads avaliable, once you got the right thread) , this switch cold get powered up by the free plug in your loom.

Hello fax,

One thing is for sure the setup woks

I use NC temp switch (OE toyota) and NC relais. Wityh NO relais it doesn't work.
I made a quick electrical layout. I hope it's clear
As you can see with IG OFF contact will be closed so direct supply from the battery will keep the fan running all the time.
Or I need permanent power to the relais but it will empty the batt.also at the end.

About the curent the fan is using... after hearing about impressive numbers up to 30Amps I measured the current myself:

At start up it peaks until 8A. Afterwards it runs with around 4A.
I fused it with 10A to be save and rapidly switch it on and off for several times ... fuse didn't blow. Now I use 15A fuse.

I drove it (7°C outside) for several km's. after stationary running the engine for 5-10min. the fan turned on for <1min and switch off again. after 5min it switches on again for less than a minute. So I guess cooling is sufficient.
Hopefully it will be the same in summer....