ZOZOMOTORS Dual Electric Fan Relay Kit 40A with 185°F Temperature Switch — Dual-Fan Control, Plug-and-Play Harness

ZOZOMOTORS Dual Electric Fan Relay Kit is a complete 40-amp relay harness with an OE-style temperature switch that automatically activates two medium/low-profile cooling fans at about 185°F and turns them off near 175°F.

This plug-and-play relay kit gives you a reliable way to control electric radiator or condenser fans without custom wiring. It bundles a 40A relay, clearly labeled wiring harness, waterproof inline fuse holder, OE-type temperature sender, adapter fittings, and terminal hardware so you can replace a failing relay setup or add a thermostat-driven fan to many vehicle cooling systems. The kit was designed for straightforward installation, compatibility with common fan sizes, and durable connections suitable for engine-bay conditions.

How will this kit work with my vehicle’s existing cooling fans?

The kit is built to drive two medium-profile or low-profile fans from a single 40A relay circuit, using the temperature switch as the trigger. It installs in the engine block or water jacket so it senses coolant temperature like factory senders.

• Single 40A relay configured to power two fans under rated load.
• Temperature switch closes at ~185°F and opens at ~175°F to automate fan control.
• Direct replacement fitment for 10", 12", 14", and 16" fans as listed.
• Includes adapter to fit either 3/8" or 1/2" sensor ports.

What’s included and how is the wiring organized?

All connections arrive pre-labeled and color-coded so you can follow the included wiring diagram without guessing. Terminals and an inline waterproof fuse provide protection and tidy power routing in the engine bay.

• 40A relay, full wiring harness, and easy-to-read wire labels.
• Inline waterproof fuse holder plus fuses; ring terminals and wire connectors included.
• RED = 12V battery positive; COFFEE = fan positive; BLACK = sending unit; GREY = ignition trigger.
• Spade connector supplied for the temp sensor for simple hookup.

Are there installation requirements or compatibility notes to know?

Yes. The temperature switch must be grounded through its threads to the engine to function correctly, and the engine’s electrical ground must be solid. Also, thermostat choice affects switch behavior.

• Sensor must screw into a grounded cylinder head or any grounded water jacket port.
• Use a 160°F thermostat when pairing with this 185°F switch; higher thermostats can prevent proper cycling.
• For high-profile fans or heavier loads, upgrade wiring for pin 30/87 to 10 AWG or choose the ZOZOMOTORS heavy-duty kit P/N 30247.
• Follow the included wiring diagram; improper grounding or wiring can stop the switch from functioning.

How durable and serviceable is the kit in everyday driving conditions?

The harness and fuse holder are designed for the harsh environment of the engine bay; connectors, hardware, and the OE-style temperature switch provide long-term serviceability. The included parts let you reterminate or extend wiring if needed.

• Waterproof inline fuse holder protects the circuit in wet or dirty conditions.
• Color-coded wires and labeled leads speed troubleshooting and repairs.
• Accessory ring terminals and wire connectors included for secure, crimped connections.
• OE-style sensor fits factory ports and is readily replaceable if service is required.

Who is this for: The ZOZOMOTORS Dual Electric Fan Relay Kit is aimed at DIY mechanics, performance enthusiasts retrofitting electric fans, and anyone replacing a worn fan relay harness on cars, trucks, ATVs, or custom cooling setups. It’s ideal when you need an easy-to-install, temperature-activated solution for two medium or low-profile fans, want labeled wiring and protective fusing out of the box, or prefer an OE-style temperature sender that mounts in the engine water jacket.