Variable Speed Electric Fan Controller Kit

The Variable Speed Fan Controller includes everything you need—sensor, relay, and wiring—to fine-tune cooling for high-demand diesel swaps, hot-rodded Toyotas, or performance engines. This thermostatic controller senses engine coolant temp (160–240°F adjustable range) via a thread‑in sending unit, automatically activating your electric fan(s) only when needed. It ensures ideal operating temps, reduces belt drag, and improves cooling system longevity.

Traditional fan switches are fixed and often fail to meet the needs of high-performance setups. 

• Prevents overheating during heavy towing or high-load operation
• Saves horsepower by cutting fans when not needed
• Extends fan motor and relay life with smart cycling
• Ideal for any vehicle with electric fans—from diesel swaps to off-road builds

Kit Includes

• Thread-in adjustable temperature sensor (160–240°F range)
• Heavy-duty automotive-grade relay
• Wiring harness with a fuse and a connector
• Easy-mount relay bracket for safe installation

Fitment:

• Electric cooling fans of virtually any size
• Gas and diesel engines, especially in high-load, performance, or swap applications
• Ideal for installation in Toyota pickups, 4Runners, & UZ swaps