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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Summit Racing™ Flex Fans SUM-G4918

Fan, Flex-Type, Heavy-Duty, Clockwise, 18 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each

Part Number: SUM-G4918

4.87 out of 5 stars ( 85 )

Estimated Ship Date: Tomorrow

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Summit Racing™ Flex Fans SUM-G4917

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

Part Number: SUM-G4917

4.82 out of 5 stars ( 107 )

Estimated Ship Date: Tomorrow

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Derale Rigid Race Fans 17317

Fan, Rigid-Type, Race, Clockwise, 17 in. Diameter, Steel Blades, Steel Hub, Universal, Each

Part Number: DER-17317

4.77 out of 5 stars ( 44 )

Estimated Ship Date: Tomorrow

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Derale Rigid Race Fans 17318

Fan, Rigid Style Race, Steel Blades, Standard Rotation, 18 in., 2.25 in. Depth, 8,000 RPM Rated, Each

Part Number: DER-17318

4.89 out of 5 stars ( 28 )

Estimated Ship Date: Tomorrow

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Derale Rigid Race Fans 17319

Fan Rigid Style Race Steel Blade 19" Std. Rotation 2" Depth 6,000 RPM Rated

Part Number: DER-17319

4.64 out of 5 stars ( 11 )

Estimated Ship Date: Tomorrow

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Derale Rigid Race Fans 17417

Fan, Mechanical, Rigid Race, 17 in. Diameter, Steel, Reverse Rotation, 8,000 RPM Rating, Each

Part Number: DER-17417

4.71 out of 5 stars ( 14 )

Estimated Ship Date: Tomorrow

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Derale Rigid Race Fans 17415

Fan, Rigid-Type, Race, Counterclockwise, 15 in. Diameter, Steel Blades/Steel Hub, Universal, Each

Part Number: DER-17415

5.0 out of 5 stars ( 12 )

Estimated Ship Date: Tomorrow

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Derale Rigid Race Fans 17418

Fan Rigid Style Race Steel Blade 18" Rev. Rotation 2" Depth 6,000 RPM Rated

Part Number: DER-17418

4.56 out of 5 stars ( 9 )

Estimated Ship Date: Tomorrow

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Jones Racing Hustler 3-Blade Fans WP-9104-15-H3

Fan, Mechanical, Aluminum Hub, Plastic Blades, 15 in. Diameter, Each

Part Number: JRP-WP9104-15-H3

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Derale Rigid Race Fans 17313

Fan, Mechanical, Rigid Race, 13 in. Diameter, Steel, Standard Rotation, 8,000 RPM Rating, Each

Part Number: DER-17313

5.0 out of 5 stars ( 7 )

Estimated Ship Date: Tomorrow

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Derale Rigid Race Fans 17320

Fan, Rigid-Type, Race, Clockwise, 20 in. Diameter, Steel Blades/Steel Hub, Universal, Each

Part Number: DER-17320

4.8 out of 5 stars ( 10 )

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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Derale Rigid Race Fans 17515

Fan, Rigid-Type, Race, Clockwise, 15 in. Diameter, Aluminum Blades/Steel Hub, Universal, Each

Part Number: DER-17515

5.0 out of 5 stars ( 6 )

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: Mar 30, 2026 if ordered today

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Estimated Ship Date: Mar 30, 2026 if ordered today

Derale Rigid Race Fans 17517

Fan, Rigid-Type, Race, Clockwise, 17 in. Diameter, Aluminum Blades/Steel Hub, Universal, Each

Part Number: DER-17517

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Derale Rigid Race Fans 17420

Fan, Rigid-Type, Race, Counterclockwise, 20 in. Diameter, Steel Blades/Steel Hub, Universal, Each

Part Number: DER-17420

4.33 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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Derale Rigid Race Fans 17315

Fan, Rigid-Type, Race, Clockwise, 15 in. Diameter, Steel Blades/Steel Hub, Universal, Each

Part Number: DER-17315

4.93 out of 5 stars ( 15 )

Estimated Ship Date: Tomorrow

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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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AFCO Racing Mechanical Fans 80181

Fan, Mechanical, Clockwise Rotation, Six Steel Blades, Silver, 17 in. Diameter, Each

Part Number: AFC-80181

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Derale Rigid Race Fans 17419

Fan, Rigid-Type, Race, Counterclockwise, 19 in. Diameter, Steel Blades/Steel Hub, Universal, Each

Part Number: DER-17419

4.2 out of 5 stars ( 5 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Derale Rigid Race Fans 17413

Fan, Rigid-Type, Race, Counterclockwise, 13 in. Diameter, Steel Blades/Steel Hub, Universal, Each

Part Number: DER-17413

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

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

Jones Racing Hustler 3-Blade Fans WP-9104-18-H3

Fan, Mechanical, Aluminum Hub, Plastic Blades, 18 in. Diameter, Each

Part Number: JRP-WP9104-18-H3

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Derale Rigid Race Fans 17518

Fan, Rigid-Type, Race, Clockwise, 18 in. Diameter, Aluminum Blades/Steel Hub, Universal, Each

Part Number: DER-17518

5.0 out of 5 stars ( 4 )

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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Estimated Ship Date: Tomorrow

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