Digital Thermatic Fan Switch Kit

The Digital Thermatic Fan Switch Kit by Davies Craig (model DC-0444) is a precision engine cooling control system designed for high-performance vehicle builders and enthusiasts who demand reliable automatic fan management. This kit solves the common problem of fixed-speed cooling fans that run inefficiently, wasting fuel and creating unnecessary noise—especially during idle and light-load conditions. Whether you're building a custom hot rod, upgrading a classic muscle car, or optimizing cooling on a modern engine swap, this digital controller delivers the intelligent fan activation your drivetrain needs.

This kit operates via a digital thermostat with a wide activation temperature range of 104 to 230 degrees Fahrenheit, allowing fine-tuned control over when your cooling fan engages and disengages. The integrated 40-amp relay handles high-current loads safely, making it suitable for single or dual fan configurations without auxiliary relay stacks. The compact form factor (5 x 3.2 x 7.6 inches) allows discreet mounting in engine bays or chassis cavities, while the adjustable settings let you dial in the exact temperature threshold that matches your engine's thermal profile and ambient conditions. This digital approach eliminates mechanical thermostat inconsistency and provides repeatable performance across all driving scenarios.

Cooling system builders, hot rod shops, and DIY engine builders benefit most from this controller when retrofitting aftermarket radiators, electric fan conversions, or dual-fan setups that lack integrated controls. Installation is straightforward: connect the sensor to your coolant passage or radiator inlet, wire the relay output to your fan motor(s), and set your desired activation point—no complex programming required. The 40-amp relay rating accommodates most 12-volt electric fan motors and small-displacement to mid-sized engine builds. This kit is essential for anyone seeking plug-and-play, temperature-responsive fan control without factory ECU modification.