Variable Temp Controller Quick Start Probe Style

The Variable Temp Controller Quick Start Probe Style (FLE106999) by FLEX-A-LITE is a precision engine cooling fan controller designed for automotive enthusiasts and mechanics who demand intelligent thermal management. This adjustable temperature controller replaces crude fan engagement systems with programmable activation logic, giving you complete authority over when your cooling fan engages based on real-time engine temperature. Whether you're running a high-horsepower street engine, a track-focused build, or a daily driver prone to overheating in traffic, this quick-start controller eliminates the guesswork and protects your investment through data-driven cooling.

The controller operates across a 160 to 240 degree Fahrenheit activation range, allowing you to dial in the exact engagement temperature that matches your engine's thermal signature and your cooling system's capacity. The included push-in temperature sensor probe monitors coolant temperature with direct precision, feeding real-time data to the controller module to trigger fan engagement only when necessary. This targeted approach reduces parasitic drag from continuous fan operation, improving fuel economy and reducing noise while preventing hot-spot buildup during sustained acceleration or towing. The complete harness kit ensures straightforward installation without splicing or custom fabrication, making this controller accessible to both seasoned fabricators and first-time modifier installers.

Serious engine builders, street rod enthusiasts, and performance mechanics benefit most from this variable temperature controller when upgrading legacy cooling systems or fine-tuning modern engines with non-stock radiators and high-output fans. The quick-start configuration means no complex programming—simply set your threshold and install. Its compact footprint (5.5 x 3.7 x 7.4 inches) fits easily in engine bays with limited space, and the 1.66 lb weight adds negligible mass to your build. Compatible with most 12V electric fan setups common in street cars, hot rods, and modified trucks, this controller becomes the nervous system of your thermal management strategy.