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Belt-Driven Radiator Cooling Fans

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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

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 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.

Showing In Stock Items. Show All 31 Items.

Individual Parts

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Results 1 - 22 of 22

Derale Heavy-Duty Flex Fans 17618

Derale Heavy-Duty Flex Fans 17618

Derale Heavy-Duty Flex Fans 17618

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

Part Number: DER-17618

5.0 out of 5 stars ( 9 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

Derale Heavy-Duty Flex Fans 17015

Derale Heavy-Duty Flex Fans 17015

Derale Heavy-Duty Flex Fans 17015

Fan, Flex-Type, Heavy-Duty, Clockwise, 15 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each

Part Number: DER-17015

4.8 out of 5 stars ( 25 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

Derale Heavy-Duty Flex Fans 17018

Derale Heavy-Duty Flex Fans 17018

Derale Heavy-Duty Flex Fans 17018

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

Part Number: DER-17018

4.79 out of 5 stars ( 14 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

Derale Heavy-Duty Flex Fans 17017

Derale Heavy-Duty Flex Fans 17017

Derale Heavy-Duty Flex Fans 17017

Fan, Flex-Type, Heavy-Duty, Clockwise, 17.25 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each

Part Number: DER-17017

4.78 out of 5 stars ( 23 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

Derale Heavy-Duty Flex Fans 17619

Derale Heavy-Duty Flex Fans 17619

Derale Heavy-Duty Flex Fans 17619

Fan, Flex-Type, Heavy Duty, Counterclockwise, 19 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each

Part Number: DER-17619

4.47 out of 5 stars ( 15 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

Derale Heavy-Duty Flex Fans 17615

Derale Heavy-Duty Flex Fans 17615

Derale Heavy-Duty Flex Fans 17615

Fan, Flex-Type, Heavy-Duty, Counterclockwise, 14.75 in. Diameter, Stainless Steel Blades/Steel Hub, Each

Part Number: DER-17615

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

Derale Heavy-Duty Flex Fans 17617

Derale Heavy-Duty Flex Fans 17617

Derale Heavy-Duty Flex Fans 17617

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

Part Number: DER-17617

4.89 out of 5 stars ( 9 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

Derale Rigid Race Fans 17418

Derale Rigid Race Fans 17418

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: Today

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Estimated Ship Date: Today

Derale Rigid Race Fans 17319

Derale Rigid Race Fans 17319

Derale Rigid Race Fans 17319

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

Part Number: DER-17319

4.8 out of 5 stars ( 10 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

Derale Rigid Race Fans 17415

Derale Rigid Race Fans 17415

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: Today

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Estimated Ship Date: Today

Derale Rigid Race Fans 17517

Derale Rigid Race Fans 17517

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: Today

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Estimated Ship Date: Today

Derale Rigid Race Fans 17515

Derale Rigid Race Fans 17515

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: Today

...Loading

Estimated Ship Date: Today

Derale Rigid Race Fans 17417

Derale Rigid Race Fans 17417

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: Today

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Estimated Ship Date: Today

Derale Rigid Race Fans 17320

Derale Rigid Race Fans 17320

Derale Rigid Race Fans 17320

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

Part Number: DER-17320

5.0 out of 5 stars ( 9 )

Estimated Ship Date: Today

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Estimated Ship Date: Today

Derale Rigid Race Fans 17420

Derale Rigid Race Fans 17420

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: Today

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Estimated Ship Date: Today

Derale Rigid Race Fans 17318

Derale Rigid Race Fans 17318

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: Today

...Loading

Estimated Ship Date: Today

Derale Rigid Race Fans 17317

Derale Rigid Race Fans 17317

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: Today

...Loading

Estimated Ship Date: Today

Derale Rigid Race Fans 17518

Derale Rigid Race Fans 17518

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: Today

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Estimated Ship Date: Today

Derale Rigid Race Fans 17313

Derale Rigid Race Fans 17313

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: Today

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Estimated Ship Date: Today

Derale Rigid Race Fans 17315

Derale Rigid Race Fans 17315

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: Today

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Estimated Ship Date: Today

Derale Rigid Race Fans 17419

Derale Rigid Race Fans 17419

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: Today

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Estimated Ship Date: Today

Derale Rigid Race Fans 17413

Derale Rigid Race Fans 17413

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: Today

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