Thermal Radiator Fan Switch With 36mm Adapter Kit

The switch actives when the sensor reaches the “on” temperature and turns off when it drops back below the “off” temperature. With 3 different temperature ranges available and adapter sizes to fit radiator hose size 35mm & 36mm.

The kit includes a pair of good quality fully stainless steel clamps, with no perforations in the band and featuring a rolled edge, suitable for all rubber and silicone hoses.

What Switch Temperature Do I Need?

This varies from vehicle to vehicle and colder is not necessarily better as the ideal operating temperature range for an engine may be higher than our lowest switch range would allow it to reach.

If possible you should find out the ideal operating temperature of your vehicle and choose a switch that turns on around 5deg. C higher than this ideal operating temperature.

If you cannot find your vehicle’s ideal operating temperature you can also estimate by the vehicles thermostat temperature. In most cases the on temperature of the switch should be around 10°C to 15°C higher than the vehicles rated thermostat opening temperature (the temp the thermostat begins to open at).

So for example if your thermostat starts opening at 74°C you want an “on” temp of 84°C to 89°C so you would use the 85°C on switch. If your thermostat opens at 82°C you want an “on” temp of 92°C to 97°C so you would use the 95°C on switch.

Typically, BMW M57s have 88 deg Thermostats so you want a 98 deg on switch, being in the tropics, you may want something that opens earlier like a 90deg – 95 deg on switch.