Best Dual Electric Fan Relay Kit With Thermostat for Reliable Engine Cooling
The right dual electric fan relay kit with a thermostat can efficiently manage engine temperatures, prevent overheating, and fit a range of 10″ to 16″ cooling fans. This guide highlights five top choices, comparing compatibility, thermostat settings, wiring ease, and durability. Each option includes a temperature-controlled switch (typically 185°F on / 175°F off) and a 40A or higher relay to power two fans. Use the buying guide below to pick the best match for your vehicle and cooling goals.
| Product | Compatible Fan Size | Thermostat On/Off | Relay Rating | Notes |
|---|---|---|---|---|
| ZOZOMOTORS Dual Electric Fan Relay Kit | 10″ – 16″ | 185°F / 175°F | 40A | Includes complete wiring harness and labeled wires |
| FASTSTORM Dual Electric Fan Relay Kit | 10″ – 16″ | 185°F / 175°F | 60A | 4-pin waterproof relay; easy diagram-based install |
| ecocstm 2 PCS Dual Electric Fan Relay Kit | 10″ – 16″ | 185°C / 175°C | 40A | High-temp nylon, waterproof housing |
| LSSYEUX Dual Electric Radiator Fan Relay Kit | 10″ – 16″ | 185°F / 175°F | 40A | Universal fit; simple wiring |
| FEXON Dual Electric Fan Relay Kit | 10″ – 16″ | 185°F / 175°F | 40A | OE-style thermostat, complete components |
ZOZOMOTORS Dual Electric Fan Relay Kit
The ZOZOMOTORS kit provides a straightforward wiring harness with clearly labeled wires and a color-coded setup. It includes a 40A relay, a temperature switch that activates around 185°F and deactivates at 175°F, and a 3/8 inch pipe thread sensor with a 1/2 inch adapter. The package covers 10″ to 16″ fans, ensuring compatibility across many vehicles. A comprehensive diagram and all necessary connectors are included, making installation efficient for DIY enthusiasts and professional installations alike.
FASTSTORM Dual Electric Fan Relay Kit
The FASTSTORM kit emphasizes cooling efficiency with a 60A relay and 4-pin waterproof relay. It supports 10″ through 16″ fans and uses a precise 185°F on / 175°F off thermostat switch. Installation is aided by a wiring diagram; recommended connections include red to +12V, blue to the relay, yellow to ignition, and grey to the temperature switch. The kit is designed for dual-fan setups but remains adaptable for single-fan configurations, with all necessary components included for a complete install.
ecocstm 2 PCS Dual Electric Fan Relay Kit
ecocstm offers a dual-relay solution with a 185°C / 175°C thermostat and a waterproof housing, built on 14AWG copper wire for strong conductivity and durability. The kit is versatile for 10″ to 16″ fans and is suitable for car or truck cooling needs. It emphasizes reliability in high-temperature environments and includes essential components for quick wiring and robust operation, making it a practical choice for those upgrading or replacing an aging cooling circuit.
LSSYEUX Dual Electric Radiator Fan Relay Kit
LSSYEUX presents a universal dual-fan relay kit designed for 10″ to 16″ fans, applicable to various 12V systems including cars and trucks. It features a thermostat switch activating at 185°F and shutting off at 175°F, with a straightforward red-to-battery, coffee-to-fan, black-to-ignition wiring scheme. The kit includes connectors and a fuse block, supporting reliable performance in both aftermarket installations and replacements of faulty wiring.
FEXON Dual Electric Fan Relay Kit
FEXON’s kit includes an OE-style thermostat that mounts to the cylinder head or water jacket, requiring grounding via engine threads. It comes with a 40A relay, wiring harness, 3/8″ to 1/2″ adapter, inline fuse holder, fuses, and multiple terminals for a complete install. The wired diagram guides users through RED to 12V, COFFEE to fan, BLACK to ignition, and GREY to the sending unit, compatible with 10″ to 16″ cooling fans for reliable dual-fan operation.
Buying Guide: Key Considerations And Comparisons
- Thermostat characteristics: Most kits use a 185°F on / 175°F off range. Some options list different scales (Celsius or Fahrenheit). Ensure the unit you choose matches your engine’s cooling needs and vehicle climate.
- Relay rating: Dual-fan systems demand higher current. A 40A relay is common, but 60A (as in FASTSTORM) offers extra headroom for high-performance setups or fans with higher current draw.
- Compatibility: Look for universal compatibility with 10″ to 16″ fans to cover most OEM and aftermarket configurations.
- Wiring complexity: Kits with clearly labeled wires, color coding, and included diagrams reduce installation time and errors. Waterproof relays and secure fuse blocks improve durability in harsh environments.
- Sensor mounting: Temperature sensor thread size (3/8″ vs 1/2″ NPT) and placement (engine head vs water jacket) affect response and reliability. Some kits require engine grounding for the thermostat to function properly.
- Durability and environment: Nylon or waterproof housings and high-temp wiring enhance longevity in heat, vibrations, and engine bays.
- Included components: A complete kit with harnesses, spade connectors, ring terminals, adapters, and diagrams saves time and reduces missing parts after purchase.
- Vehicle-specific considerations: If towing, racing, or stop-and-go traffic is common, prioritize tighter temperature control and robust relays to prevent overheating.
- Maintenance and replacements: Check whether the seller provides spare fuses, connectors, and a straightforward return policy for defective parts.
Across the five selections, all offer dual-fan capability with a thermostat-triggered control scheme. For high-demand setups, FASTSTORM’s higher 60A relay and waterproof design provide added reliability. For straightforward installations with strong wiring integrity, ZOZOMOTORS, ecocstm, LSSYEUX, and FEXON present solid options with comprehensive hardware and clear instructions. When choosing, align the thermostat type, relay rating, and wiring simplicity with your vehicle’s cooling demands and your installation environment.