Fan Switch Kit

The DERALE Fan Switch Kit (model 16730) is a temperature-activated control module designed for engine cooling systems that require automatic fan engagement at precise operating temperatures. This 180-degree on/165-degree off switch is engineered for drivers and technicians who need reliable, mechanical fan control without electronic complexity. By automating fan activation based on coolant temperature thresholds, this kit eliminates manual fan operation and optimizes engine cooling efficiency across a wide range of driving conditions.

This mechanical switch uses a bimetallic sensing element that expands and contracts with coolant temperature changes, triggering fan engagement at 180°F and disengaging at 165°F. The kit includes both a 1/8-inch NPT threaded connection for direct coolant line integration and a 3/8-inch NPT bushing adapter, enabling flexible installation into various engine block configurations. The compact form factor (2.75 × 1.4 × 4.25 inches, weighing just 0.17 lbs) allows for discreet mounting, while the straightforward mechanical design requires no wiring or electronic modules, reducing installation time and potential electrical failures.

Street rod builders, classic car restorers, and performance enthusiasts benefit most from this switch kit when upgrading cooling systems with aftermarket radiators or electric fans. Its dual-port design accommodates both direct NPT threads and bushed connections, making it compatible with most traditional engine blocks and modern swap applications. Installation requires only basic tools and coolant system knowledge; users drain the cooling system partially, thread the switch into the selected port, reconnect hoses, and refill. This kit is ideal for carbureted and traditionally aspirated engines where mechanical simplicity and reliability take priority over computer-controlled thermal management.