Best Cooling Fan Relay Switches for Cars: Top 5 Picks
When engine cooling depends on reliable fan relays, you need a precision part that lasts. This guide reviews the best cooling fan relay switches for automotive use, focusing on reliability, ease of installation, and compatibility. Ideal buyers include DIY enthusiasts upgrading cooling systems, owners replacing aging relays, and anyone upgrading to more efficient electric fan setups. Below is a quick summary and a deeper look at five strong options.
| Product | Best For |
|---|---|
| GM Genuine Parts 13500114 Multi-Purpose Relay | OEM-grade replacement for GM vehicles; best for maintaining factory reliability |
| FASTSTORM Electric Fan Relay Kit (60 A) | Single-fan upgrades; solid all-around performance |
| FASTSTORM Dual Electric Fan Relay Kit (60 A) | Dual-fan setups; best for higher cooling demand |
| Engine Cooling Fan Relay Kit 902-310 / 68023333AA | OEM-style fitment for specific Wrangler/Chrysler models; easy replacement |
| Oriental Power 12V/24V Digital Radiator Fan Controller Kit (Part #0444) | Digital control with adjustable temp range; best for precise cooling management |
GM Genuine Parts 13500114 Multi-Purpose Relay
The GM Genuine Parts 13500114 is an OEM-recommended replacement designed to mimic the original factory component. It offers GM OE specification for fit, form, and function, promoting dependable operation in GM vehicles. Best for owners seeking factory-level reliability and seamless compatibility with GM electrical systems. A potential limitation is that this is a single-purpose relay designed to align with GM configurations, so cross-vehicle compatibility may be limited.
FASTSTORM Electric Fan Relay Kit 60 Amp
Best for upgrading a single fan or replacing an aging relay with a robust 60-amp unit. This kit includes a four-pin waterproof relay and is compatible with 10″, 12″, 14″, and 16″ fans. It is designed to prevent engine overheating and improve overall cooling efficiency. A caution is the kit focuses on a single-fan setup; if you run a dual-fan system, a dual-relay kit might be a better match.
FASTSTORM Dual Electric Fan Relay Kit
Ideal for vehicles with dual cooling fans, this 60-amp dual kit includes two relays, a four-pin relay, and a thermostat-controlled switch. It maintains engine temperature by activating fans at 185°F and turning them off at 175°F. Choose this if you need balanced cooling across two radiators or two fan locations. A limitation is more complex wiring and component count, which may require careful installation for optimal results.
Engine Cooling Fan Relay Kit 902-310 / 68023333AA
Best for specific model-fitment, including 2005-2006 Wrangler TJ and related Chrysler/Dodge vehicles. This kit replaces several part numbers and regulates fan operation to ensure proper engine cooling. Choose this if you own a listed Wrangler or Chrysler minivan and need a direct OEM-style replacement. Limitation: compatibility is primarily with the listed models rather than a universal fit.
ZOZOMOTORS Electric Fan Wiring Kit with Thermostat
Best for model-agnostic upgrades with clear labeling and a complete wiring diagram. This kit supports 10″, 12″, 14″, and 16″ fans and includes a 40A relay and a thermostat switch. It’s a strong choice for straightforward installations and dual-fan configurations. A limitation is power capacity is fixed at 40A, which may not suit high-draw dual-fan setups unless within the rating.
ecocstm 2 Pack Electric Fan Relay Kit
Best for replacing faulty wiring in multiple vehicles or for truck engine cooling setups requiring dual-relay capability. This two-pack includes a 185°F on / 175°F off thermostat switch and a 60A relay, suitable for various 10-16 inch fans. Consider this option if you manage more than one cooling circuit. Limitation: requires careful earth grounding and wiring to ensure consistent operation across vehicles.
12V/24V Digital Electric Radiator Fan Controller Kit
Best for precise digital control with an adjustable temperature range (104-230°F) and LED real-time display. This kit supports 12V and 24V systems and offers auto-on at the threshold with a 30A load capacity for one or two fans. Choose this for detailed temperature management and energy efficiency. A note: ensure your vehicle’s electrical system can handle the digital controller and that the sensor placement provides accurate readings.
Buying Guide: Key Considerations for Cooling Fan Relay Switches
- Compatibility: Confirm fan size (10–16 inches) and your vehicle’s electrical system. Dual-fan setups require dual-relay configurations.
- Thermostat and control range: Look for on/off thresholds (commonly 185°F/175°F) or adjustable digital ranges for precise cooling decisions.
- Power rating: Choose relays and wiring kits that support the total current draw of your fans. Singles use 40–60A units; dual-fan kits may need higher or two relays.
- Wiring complexity: Some kits include complete wiring diagrams and labeled wires, which simplifies installation. Others may require more electrical work.
- Durability: Waterproof or weatherproof relays and rugged wiring protect against heat and road contaminants.
- Fitment vs. universality: OEM-style replacements offer seamless compatibility for specific models; universal kits provide broader applicability but may require adaptation.
- Sensor placement and grounding: Proper grounding and sensor positioning are crucial for accurate temperature triggering and reliable operation.
- Future expansion: If you plan upgrades (more fans or higher cooling demand), consider dual-relay kits or programmable digital controllers.
FAQ
- What is a cooling fan relay switch best used for?
It controls when radiator or auxiliary fans turn on and off based on temperature or wiring signals, preventing overheating and improving engine efficiency.
- Can I install a dual-relay kit in a single-fan vehicle?
Yes, but you won’t gain the benefit of dual cooling corridors. A single-relay kit is sufficient for one fan; use dual-relay only if you have two fans or separate cooling loops.
- Are OEM relays better than aftermarket options?
OEM relays offer factory-grade reliability and fitment, while aftermarket kits may provide broader compatibility or features like digital temperature control.
- Do digital thermostatic controllers require special wiring?
They usually include wiring diagrams and multiple connection points. Ensure proper earth grounding and follow the included instructions for sensor placement and power connections.
- What temperature should I set for fan activation?
Commonly around 185°F with a turn-off around 175°F, but digital controllers can be tuned to your vehicle’s cooling characteristics for optimal performance.