Fan Controllers

Does your cooling fan run all the time, or does it only kick in once the temperature is already too high? Here we bring together fan controllers that let you decide when an electric cooling fan switches on, as well as complete fan modules for replacement. For you who are fitting an extra fan or want to control engine temperature more precisely.

What a fan controller does

A fan controller switches the electric cooling fan on and off based on coolant temperature, so the fan typically only runs when the engine needs it. With an adjustable controller, you choose the switch-on temperature yourself. A PWM controller – pulse-width modulation – can instead regulate fan speed steplessly, if the fan supports it. From Mishimoto, for example, we have both adjustable controller kits and a PWM controller.

How to choose a fan controller

Look at more than just the function:

• Sensor: Mishimoto's adjustable kits are available with a probe sensor or with a 1/8in NPT sensor that screws into a thread. Which one fits depends on where you can place it in your cooling system.
• Fan: Check that the controller can handle the fan's current draw and whether the fan supports speed control. If you need the fan itself, see our cooling fans.
• Switch-on temperature: Set it according to engine and thermostat. If it is set too high, it can increase the risk of overheating.
• Airflow: A fan shroud can typically help the fan pull air through the entire radiator, and for fans with separate blades you will find fan blades.

Complete cooling fan modules

If the original fan is faulty, a complete module can replace it. From Gates, for example, we have modules for the Volvo S60, Hyundai Sonata and Range Rover Evoque. Fitment depends on model year and engine, so compare the part number with your car before you order.

Frequently asked questions

What is the difference between an adjustable and a PWM fan controller?

An adjustable controller switches the fan on and off at a temperature you set yourself. A PWM controller can vary the speed, so the fan can run slowly at low load. This typically requires a fan that can be controlled that way.

Should I choose a probe sensor or an NPT sensor?

An NPT sensor requires a 1/8in NPT thread to screw into, while a probe sensor is fitted without a thread. The choice depends on what your cooling system allows, so check the product description for the specific mounting method.

Why doesn't the fan start even though the engine gets hot?

It can be caused by a switch-on temperature set too high, a sensor with poor contact, a faulty fan motor or a wiring fault. Check fuses, connectors and settings before you replace parts.