Belt-Driven Radiator Cooling Fans

Belt-driven radiator fans are engine cooling fans driven directly by power from the engine via a pulley or belt from the water pump.

There are two main types of a belt-driven...

Belt-driven radiator fans are engine cooling fans driven directly by power from the engine via a pulley or belt from the water pump.

There are two main types of a belt-driven fan: clutch fans and flex fans.

Clutch Fans

Belt-driven clutch fans attach to a fan clutch. Most of the time, these fans are spinning at some fraction of the water pumps’ speed, but above a certain temperature, the thermostat in the fan clutch fully locks up, and the fan operates at the same speed as the water pump, drawing extra air through the radiator.

Flex Fans

Flex fans don’t have a clutch, so they spin at 100% of the speed of the water...

Belt-driven radiator fans are engine cooling fans driven directly by power from the engine via a pulley or belt from the water pump.

There are two main types of a belt-driven fan: clutch fans and flex fans.

Clutch Fans

Flex Fans

Flex fans don’t have a clutch, so they spin at 100% of the speed of the water pump all the time! Most flex fans also have flexible blades that flatten out at high speeds, reducing the parasitic loss of horsepower.

Belt-driven vs. Electric Cooling Fans

Which is the right fan for your application? Since their speed is tied directly to rpms, mechanical radiator fans are ideal for vehicles that operate at higher revs, like towing vehicles and off-road rigs. They’re also simpler, without sensors, wiring, or electrical draw to worry about.

There are a lot of advantages to switching to an electric fan: they take up less room, they’re more energy efficient, and you can manually deactivate them (a handy feature for off-road vehicles crossing water or mud).

For a complete discussion on the subject of radiator cooling fans, check out this article on our blog.

Top Brands

Summit Racing Equipment has everything you need for anything you drive, and that includes belt-driven fans in a wide variety of sizes and blade counts, plus stock replacement and restoration fans. Shop here for the best brand names in cooling, including Flex-a-lite, Goodmark, Dorman, Perma-Cool, Maradyne, Vintage Air, and many more.

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Flex-A-Lite Wide Blade Flex Fans 105496

Fan, Flex-Type, Wide Blade, Clockwise, 19.312 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each

Part Number: FLX-105496

4.0 out of 5 stars ( 8 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Flex Fans 101254

Fan, Flex, Mechanical, Clockwise, 16 in. Diameter, Stainless Steel Blades/Steel Hub, Each

Part Number: FLX-101254

5.0 out of 5 stars ( 8 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Wide Blade Flex Fans 104482

Fan, Flex-Type, Wide Blade, Clockwise, 17 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each

Part Number: FLX-104482

4.79 out of 5 stars ( 19 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Wide Blade Flex Fans 104803

Fan, Flex-Type, Wide Blade, Clockwise, 18.25 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each

Part Number: FLX-104803

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Wide Blade Flex Fans 104483

Fan, Flex-Type, Wide Blade, Clockwise, 18.25 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each

Part Number: FLX-104483

5.0 out of 5 stars ( 10 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Wide Blade Flex Fans 104801

Fan, Flex-Type, Wide Blade, Clockwise, 16 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each

Part Number: FLX-104801

4.5 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Flex Fans 101567

Fan, Flex, Mechanical, Clockwise, 17 in. Diameter, Stainless Steel Blades/Steel Hub, Each

Part Number: FLX-101567

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Wide Blade Flex Fans 105495

Fan, Flex-Type, Wide Blade, Clockwise, 17 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each

Part Number: FLX-105495

4.3 out of 5 stars ( 10 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Flex Fans 101259

Fan, Flex, Mechanical, Clockwise, 18.25 in. Diameter, Stainless Steel Blades/Steel Hub, Each

Part Number: FLX-101259

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Nylon Mechanical Fans 116567

Fan, Flex-Type, Clockwise, 17 in. Diameter, Nylon Blades/Hub, Universal, Each

Part Number: FLX-116567

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Flex Fans 102113

Fan, Flex, Counterclockwise, 17 in. Diameter, Stainless Steel, Silver, Each

Part Number: FLX-102113

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Flex Fans 106278

Fan, Flex, Counterclockwise, 18.250 in. Diameter, 6 Blade, Stainless Steel, Silver, Each

Part Number: FLX-106278

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Race Fans 101350

Fan, Standard Blade-Type, Race, Clockwise, 18.250 in. Diameter, Steel Hub/Aluminum Blades, Universal, Each

Part Number: FLX-101350

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Flex-A-Lite Nylon Mechanical Fans for 1965-1971 442, 1980-1983 CUTLASS CRUISER, 1971-1987 CUTLASS SUPREME - 116562

Fan, Flex-Type, Clockwise, 16 in. Diameter, Nylon Blades/Hub, Universal, Each

Part Number: FLX-116562

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Flex-A-Lite Flex Fans 102117

Fan, Flex, Mechanical, Clockwise, 19.375 in. Diameter, Stainless Steel Blades/Steel Hub, Each

Part Number: FLX-102117

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Flex-A-Lite Nylon Mechanical Fans for 1986-1987 AEROSTAR, 1976-1987 CHEVETTE, 1983-1997 RANGER - 104715

Fan, Flex-Type, Clockwise, 14 in. Diameter, Nylon Blades/Hub, Universal, Each

Part Number: FLX-104715

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Flex-A-Lite Race Fans 101580

Fan, Race, Clockwise, 17 in. Diameter, Aluminum, Silver, Each

Part Number: FLX-101580

Not Yet Reviewed

Estimated Ship Date: Apr 20, 2026 if ordered today

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Estimated Ship Date: Apr 20, 2026 if ordered today

Flex-A-Lite Race Fans 101584

Fan, Race, Clockwise, 17 in. Diameter, Steel, Silver, Each

Part Number: FLX-101584

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Flex-A-Lite Nylon Mechanical Fans 104465

Fan, Flex-Type, Clockwise, 18.375 in. Diameter, Nylon Blades/Hub, Universal, Each

Part Number: FLX-104465

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Flex-A-Lite Race Fans 101354

Fan, Standard Blade-Type, Race, Clockwise, 19.250 in. Diameter, Steel Hub/Aluminum Blades, Universal, Each

Part Number: FLX-101354

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Flex-A-Lite Race Fans 125855

Fan, Mechanical, Race, 17 in., Standard Clockwise Rotation, Steel Hub, Steel Blades, Silver, Each

Part Number: FLX-125855

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Flex-A-Lite Race Fans 102122

Fan, Standard Blade-Type, Race, Clockwise, 15.250 in. Diameter, Steel Hub/Aluminum Blades, Universal, Each

Part Number: FLX-102122

Not Yet Reviewed

Estimated Ship Date: Apr 20, 2026 if ordered today

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Estimated Ship Date: Apr 20, 2026 if ordered today

Flex-A-Lite Race Fans 106285

Fan, Race, Clockwise, 19.25 in. Diameter, Steel, Silver, Each

Part Number: FLX-106285

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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