Overview
The Flex-A-Lite Dual 15-inch Electric Fans, part number FLX116545, is a dual electric cooling fan system built around two 15-inch S-Blade fans. It is a direct-fit, bolt-on replacement for the stock clutch fan assembly on 2003-2007 Ford Super Duty trucks with the 6.0L diesel engine.
Electric fans of this kind replace a clutch-driven fan, and the swap can help recover horsepower and improve fuel economy. A Flex-a-lite Variable Speed Controller adjusts fan speed between 60-100 percent based on radiator temperature.
Key features
- Two 15-inch S-Blade electric fans in a double fan style
- Variable Speed Controller that varies fan speed from 60-100 percent
- Moves up to 6,800 cfm of airflow
- Designed to replace the stock clutch fan assembly
Fan speed and cooling demand
A variable speed controller changes how hard the fans run based on the temperature the sensor reads. At light load the fans can run slowly and quietly, and as the radiator warms they speed up to pull more air through the core. This matters on trucks that switch between highway cruising and slow towing, where cooling demand changes quickly.
Air moves best when the fans sit close to the radiator without touching it, and the shroud seals the gap so air is pulled through the core rather than around it. Check that the blades clear the shroud and that the fan mounts are tight before running the system. Keep the radiator fins free of leaves, mud and insects, since blocked fins reduce cooling even with strong fans.
Ground and power connections deserve extra attention because the fans draw current when they run. Use clean, tight terminals and a relay feed sized for the load. A loose ground can cause erratic fan operation that looks like a controller fault.
- Keep radiator fins clear of debris
- Check shroud seal and blade clearance
- Clean and tighten ground connections
Specifications
| Brand | Flex-A-Lite |
|---|---|
| Part number | FLX116545 |
| Blade style | S-Blade |
| Fan style | Double |
| Fan size | 15 inch |
| Airflow | Up to 6,800 cfm |
| Fan speed control | 60-100 percent, varied by radiator temperature |
Vehicle fitment
The kit is designed for 2003-2007 Ford Super Duty trucks with the 6.0L diesel engine. Confirm fit for your truck’s year, model and engine before ordering.
Check the Ford Super Duty engine and model year against your truck, and confirm the fan dimensions before installing. Verify your truck’s year, model and trim before ordering.
Installation notes
Because the fans replace the stock clutch fan assembly, disconnect the battery before working on the fan wiring or removing the old clutch fan.
What’s included
The kit includes two 15-inch S-Blade electric fans and a Flex-a-lite Variable Speed Controller.
Check the package contents against your installation before starting, including mounting hardware and wiring.
