Best Relay Kits for Electric Fans to Improve Cooling Efficiency
If you’re upgrading or repairing an electric cooling fan, a reliable relay kit is essential. These kits control fan operation precisely, helping prevent overheating and improve engine performance. The following five products are selected for American buyers based on compatibility with common 10–16 inch fans, thermostat-controlled operation, and robust wiring. This guide highlights who each kit is best for and why it stands out, with practical cautions where applicable. A quick buying table summarizes the main options below.
| Product | Fan Size Compatibility | Key Feature | Best For |
|---|---|---|---|
| FASTSTORM Electric Fan Relay Kit 12V 60 AMP | 10–16 in | 185°F on / 175°F off thermostat, waterproof 4-pin relay | |
| 2 PCS Electric Fan Relay Kit, Dual | 10–16 in | Dual relays, OE-style thermostat, 185/175°F control | |
| FASTSTORM Dual Electric Fan Relay Kit | 10–16 in | Dual kit, 60A relay, 185/175°F control, complete wiring | Versatile dual-fan installations |
| ZOZOMOTORS Dual Electric Fan Relay Kit | 10–16 in | 40A relay, 185/175°F control, labeled wires | Budget-conscious dual-fan projects |
| Electric Fan Wiring Kit by ZOZOMOTORS | 10–16 in | 40A relay, thermostat control, labeled wiring | Single or dual-fan upgrades with clear wiring |
FASTSTORM Electric Fan Relay Kit 12V 60 AMP
The FASTSTORM kit uses a 60-amp relay with a 4-pin waterproof design suitable for 10, 12, 14, and 16 inch fans. It includes a thermostat switch set to 185°F on and 175°F off, enabling precise engine cooling and reduced fan cycling. This kit is ideal for enthusiasts converting to electric fans or replacing aging components in single or dual configurations. A complete wiring diagram and all needed connections simplify installation, making it a strong choice for stock or lightly upgraded cooling systems.
Best for: Vehicle owners seeking reliable single or dual-fan control with clear temperature thresholds and a waterproof relay. Choose this if you value a robust kit with straightforward wiring and a dedicated thermostat switch for precise heat management. Caution: ensure proper grounding and compatibility with your vehicle’s electrical system to avoid miswiring.
2 PCS Electric Fan Relay Kit, Dual
This dual relay kit is designed for 10–16 inch fans and includes two relays with a thermostat that opens at 185°F and closes at 175°F. Built from high-temperature nylon with a waterproof housing, the kit emphasizes durability in demanding environments. Its 14 AWG wiring offers solid conductivity, and the included wiring harness supports straightforward replacement of faulty wiring or engines needing improved cooling efficiency.
Best for: Those wiring two fans or upgrading an existing dual-fan setup with a thermostat-controlled solution. Limitations: proper earth grounding is required for the thermostat installation to function correctly, which may add to installation steps for some engines.
FASTSTORM Dual Electric Fan Relay Kit
This kit provides a complete dual-fan solution with a 60A relay, 4-pin connector, and a precise 185°F on / 175°F off thermostat. It’s compatible with 10–16 inch fans and includes a full wiring harness, fuse holders, and spare fuses. Installation is designed to be straightforward via the included diagram, making it a strong contender for drivers upgrading to dual cooling or replacing an aging dual relay setup.
Best for: Buyers who need a comprehensive dual-fan wiring solution with robust components and a clear installation path. Better for: dual-radiator or dual-radiator-style setups that require dependable switching. Caution: verify that your engine bay has adequate space for the dual harness and fuse layout to avoid clearance issues.
ZOZOMOTORS Dual Electric Fan Relay Kit
ZOZOMOTORS offers a 40A dual-relay kit that’s compatible with 10–16 inch fans. The kit includes clearly labeled wires and a detailed wiring diagram. Temperature control uses the standard 185°F on / 175°F off behavior, with a 3/8 inch pipe thread temp sensor and a 1/2 inch adapter. This makes it practical for many installations while keeping costs reasonable. Note that matching thermostat settings with your engine’s cooling needs is essential for optimal performance.
Best for: Budget-conscious buyers who still want a thermostat-driven dual-fan solution with clear wiring. Limitation: 40A may be insufficient for high-powered fans or heavy-duty cooling loads; confirm your fan’s current draw before purchasing.
Electric Fan Wiring Kit by ZOZOMOTORS
This kit provides a straightforward single-to-dual-fan wiring option with a 40A relay and 185/175°F thermostat. It includes labeled wires, a temperature switch with a 3/8 inch pipe thread, and a 1/2 inch adapter. The package emphasizes complete coverage for 10–16 inch fans and offers a practical upgrade path for replacing faulty wiring or adding a second fan. It requires a compatible ground and proper thermostat earth connection for reliable operation.
Best for: People replacing aging wiring with a clearly labeled, easy-to-install kit. Choose this to simplify wiring projects and ensure consistent temperature control. Caution: ensure your thermostat ground is attached to the engine block to avoid intermittent fan operation.
Buying Guide: Practical Considerations For Electric Fan Relay Kits
- Compatibility: Most kits support 10–16 inch fans. Verify your fan size and the vehicle’s electrical capacity before purchasing.
- Thermostat Settings: Most kits use 185°F on / 175°F off. This balance reduces overcooling and unnecessary fan operation while protecting the engine.
- Current Rating: Relays commonly switch 40A or 60A. Choose a higher rating if you have high-current fans or dual-fan configurations to avoid overheating the relay.
- Wiring Complexity: Some kits include full wiring harnesses, diagrams, fuses, and adapters. If you’re a beginner, opt for a complete kit with clear instructions.
- Durability: Waterproof relays and high-temperature wiring enhance reliability in engine bays. Look for IP-rated housings and quality copper conductors.
- Installation Fit: Consider space restrictions around the radiator, shroud, and hoses. A compact kit with a streamlined harness reduces installation friction.
- Grounding: Correct grounding is essential for thermostat operation and to prevent erratic fan behavior. Ensure engine block grounding when required.
- Single vs Dual: For dual-fan systems, ensure the wiring kit includes two relays, a robust harness, and a shared ground path to prevent cross-talk between circuits.
FAQ: Electric Fan Relay Kits
- What is the purpose of a fan relay kit?
It controls the electric cooling fan(s) by switching power to the motor based on a temperature sensor, helping prevent overheating and improving efficiency. - Can I install a dual-fan relay kit on a single-fan setup?
Yes, but you may need adapters or a single relay wired in parallel. Follow the included diagram to avoid overloading circuits. - Is a thermostat necessary for fan control?
Thermostats provide automatic activation based on engine temperature, offering precise cooling without manual operation. - What should I consider when selecting a 40A vs 60A kit?
A 60A kit is better for high-current fans or dual-fan configurations, while 40A is often sufficient for standard single-fan setups. - Do I need to professional install these kits?
Many kits are designed for DIY installation, but if you’re unsure about wiring and grounding, professional help can prevent electrical issues. - How important is waterproofing in the relay kit?
Waterproof relays protect connections from moisture and road spray, extending reliability in engine bays.