Thermofan constantly running, or not running at all? Avoid damaging the fan or potentially your engine with this Davies Craig Thermal Switch and Relay system. This system works to replace the standard thermofan control system in most standard cars, or can easily be used to upgrade older vehicles where temperature control systems were never fitted.

How easy is it to use?

The Davies Craig Thermal Switch and Relay system works on a mechanical thermal switch, and is relatively easy to install with few draw backs. Temperature is measured with a probe that is designed to be inserted into radiator hose, and then a small sensor unit reports to a thermal switch. This switch can be calibrated from 40 degrees Celsius, all the way through to 100 degrees Celsius, allowing factory-esque fan operation for any vehicle. This thermal switch then triggers a separate relay when the desired temperature is reached, sending power to the fan. All-in-all, this is one of the easiest thermal control systems to fit on the market, including everything you need to get going, from a pre-made wiring harness to connectors and mounting brackets. A detailed instruction manual is also included, to guide you through each step of the installation process.

Where can you use it?

Almost all front wheel drive cars on the road are fitted with thermo fans which are typically controlled by old mechanical switches. Unfortunately, corrosion and dirt can lead to a failure of these components causing the thermo fan (the fan which cools your engine) to cease spinning, or to spin constantly, placing excess strain on the fan and on the vehicles alternator. The Davies, Craig Thermal Switch and Relay system is a great solution to this issue; as it is simple to install and can completely circumvent the expensive and sometimes over-complicated standard system. However, this system also has other uses; not only is it ideal for older cars where no electronic control systems where offered from the manufacturer, this system can also be setup to operate the fan whenever Air-conditioning systems are switched on inside the car, a feature which most basic kits lack. This kit can even be used to control Davies, Craig Electronic Water Pump (EWP) systems as well, opening another door for cooling options.

It should be noted however that some vehicles also operate a ‘clutch-fan’ which may be primarily responsible for the cooling of your engine. If you have a cooling fan that isn’t operating correctly, and are unsure of the type of fan it is, it might be worth speaking to your local mechanic, or having a chat to our friendly team in-store.