Using thermal switch for electric fans

[VX L67 Getrag]

Well I'm working on a Soarer ATM & pissing off hydraulic fans & have a thermal switch out of a EF & thinking I can just use earth through switch to trigger relay for fans?

Not sure if how it will work it has 24k resistance ambient & 3k resistance at 90degrees!

Is there a certain relay I'll have to use or better way to wire it?

TIA VXL67Getrag

[Holden202T]

Keep in mind the thermostat switches you can put in the radiator hose and they are adjustable

[VX L67 Getrag]

Yeah but they suck with the crap rubber bit to fit under hose or cut hose & install doesn't look as neat as this idea IMHO, just so long as it will work!

[festy]

3k resistance sounds a bit high?
My alfas use a thermo switch in the radiator and a garden variety relay for the fan, I'll see if I can find the specs on the switch to compare...

[VK_3800]

Either its not a switch (maybe a temp sender) or it isn't switched on at 90 degrees, you will need basically zero resistance to switch the relay on. Make sure you use one with a suitable temp for your engine and cooling system

[VX L67 Getrag]

Yeah it probably is a sender as the ECU may control fans through it for the EF!

Bugger was hoping to use stuff lying around!

[vlad01]

Yeah it probably is a sender as the ECU may control fans through it for the EF!

Bugger was hoping to use stuff lying around!

that it does!

[vs ss]

yeah they do go through the ecu and work on resistance just like the commodores do.

you beat me vlad