EFI Fan Wiring Kit

The EFI Fan Wiring Kit from Cold Case Radiators is an essential component for anyone upgrading to electronic fuel injection cooling systems or retrofitting a classic vehicle with modern engine management. This kit bridges the gap between your engine's ECU and aftermarket electric cooling fans, eliminating the need for mechanical fan clutches that waste horsepower and reduce efficiency. Whether you're building a restomod, upgrading a carbureted engine to EFI, or installing a high-performance radiator setup, this wiring harness ensures reliable fan engagement based on actual coolant temperature rather than engine speed.

This wiring kit is engineered to work seamlessly with EFI fuel injection systems that monitor engine coolant temperature and trigger fan operation at precise setpoints. The kit includes everything needed to integrate an electric cooling fan with your EFI harness—properly sized conductors, relays, and connectors designed to handle the electrical demands of modern fan motors without voltage drop or heat buildup. Cold Case Radiators' engineering ensures the system responds quickly to temperature changes, preventing overcooling during startup and maintaining optimal operating temperature under sustained load. The compact, organized layout of this harness minimizes installation time and reduces the risk of incorrect connections that could damage your ECU or fan motor.

Technicians and enthusiasts working on fuel-injected engines—from LS swaps and 5.0 coyote builds to modern small-block restorations—rely on this kit to achieve reliable thermal management without the parasitic loss of belt-driven fans. It pairs perfectly with Cold Case Radiators' aftermarket cooling cores and works with most EFI control systems that provide a cooling fan output signal. Installation is straightforward for those familiar with engine bay wiring, though professional installation is recommended if you're unfamiliar with automotive electrical systems. This kit saves you the guesswork of sourcing individual components and ensures compatibility across your fuel injection platform.