This switch will turn on your fan when your coolant reaches 190* 

This Metric LS Thermal Switch is intended specifically for LS Engines!

Finally! A thermal switch for LS that's the correct metric thread to screw into the cylinder head, at a reasonable price. NO ADAPTERS NEEDED! No more sticking a temp bulb through the radiator. Keep your swap vehicle cool automatically. 

Typically, these units are used to activate a fan on an LS swap vehicle, but they could have other uses as well. This unit is rated to close the circuit (aka turn on the fan) at 190*. We use these to supply ground to either the fan or fan relay, but it's rated to 30 AMPs for use on the positive side as well. 

We also stock these in 180* and 200* - Check out our other items!

ALWAYS use a relay to power an automotive fan. This product is not intended as a replacement for a fan relay.

Made in USA!