Electric Radiator Fan Thermostat Switch Kit 185/1755F - 85/79C

Electric Radiator Fan Switch & Relay Kit – 185°F ON / 175°F OFF

This complete electric radiator fan switch and relay kit automatically turns your cooling fan on at 185°F (85°C) and off at 175°F (79°C) — right in the sweet spot of most vehicle operating temperatures (85–95°C / 185–203°F).

Perfect for street cars, hot rods, classics, drift cars, off-road trucks, or any vehicle running an aftermarket electric fan.

These can also be used to bye-pass your current electric fan switch system if faulty. Will work on any 12v fed electrical system. 

You can also wire in a switch in car if you want to turn the fans on manually in cabin. Good for race car application, such as drift or burnout. 

Why This Temperature Range?

Most engines run optimally between 85°C and 95°C.
This kit keeps your cooling system in that ideal zone by:

• Switching fans on at 185°F / 85°C

• Switching fans off at 175°F / 79°C

This helps maintain stable coolant temps whether idling, cruising, or under load.

Complete Fan Control Kit

Includes everything needed to wire your electric fan to operate automatically and independently:

Package Includes

• 1 × 50A Relay

• 1 × Pre-wired Loom / Wiring

• 1 × Temperature Sensor (3/8" thread)

• 1 × 3/8" → 1/2" Adapter

• 1 × Circuit Breaker

• Assorted Terminals & Connectors

• 1 × Instruction Sheet

Works with any 12V system.

Fan Compatibility

• Supports single fans up to 50 amps, OR

• Two fans as long as their combined draw is under 50 amps total

Ideal for:

• Aftermarket alloy radiator setups

• Thermo fan conversions

• Cooling upgrades on high-performance engines

Features & Benefits

• Automatically controls your electric cooling fan

• Stable engine temperatures

• Protects against overheating in traffic or at low speeds

• Easy to install – everything included

• Universal fit

• Suitable for Hot Rods, Muscle Cars, JDM builds, 4×4, Classic Aussie cars, and Japanese models