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.

Individual Parts

Part Groups

Results 1 - 25 of 437

Goodmark Mechanical Cooling Fans GMK4012312681

Fan, Clutch-Type, Clockwise, 18 in. Diameter, Steel Blades/Hub, Chevrolet, GMC, Each

Part Number: GMK-4012312681

4.5 out of 5 stars ( 10 )

Estimated Ship Date: Tomorrow

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Derale Clutch Fans 17118

Fan, Clutch-Type, Clockwise, 18 in. Diameter, Steel Blades/Hub, Universal, Each

Part Number: DER-17118

4.75 out of 5 stars ( 71 )

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 ( 3 )

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 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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Derale Heavy-Duty Flex Fans 17019

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

Part Number: DER-17019

4.44 out of 5 stars ( 18 )

Estimated Ship Date: Tomorrow

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OER Mechanical Cooling Fans 3991431

Blades,1971-79 Fan Blade 19-1/2 in., 7 Blade, Each

Part Number: OER-3991431

4.6 out of 5 stars ( 5 )

Estimated Ship Date: Tomorrow

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Derale Hi Performance Stainless Steel Flex Fans 19117

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

Part Number: DER-19117

4.75 out of 5 stars ( 20 )

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

5.0 out of 5 stars ( 1 )

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

4.8 out of 5 stars ( 10 )

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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Derale Rigid Race Fans 17417

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

Part Number: DER-17417

4.67 out of 5 stars ( 12 )

Estimated Ship Date: Tomorrow

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Allstar Performance 6-Blade Fans ALL30100

Fan, Mechanical, Clockwise, 6 Blades, Steel, Black, 18 in. Diameter, 5/8 in. Pilot Hole Diameter, Each

Part Number: AAF-ALL30100

4.5 out of 5 stars ( 18 )

Estimated Ship Date: Aug 18, 2025 if ordered today

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Estimated Ship Date: Aug 18, 2025 if ordered today

OER Mechanical Cooling Fans K193

Fan, Clutch-Type, Clockwise, 18 in. Diameter, Steel Blades/Hub, Chevrolet, GMC, Each

Part Number: OER-K193

4.25 out of 5 stars ( 4 )

Estimated Ship Date: Jan 20, 2026 if ordered today

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Estimated Ship Date: Jan 20, 2026 if ordered today

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Derale Clutch Fans 17117

4.75 out of 5 stars ( 62 )

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

5.0 out of 5 stars ( 8 )

Estimated Ship Date: Tomorrow

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Derale Hi Performance Aluminum Narrow Blade Flex Fans 19418

Fan, Flex-Type, High Performance, Clockwise, 18 in. Diameter, Aluminum Blades/Steel Hub, Universal, Each

Part Number: DER-19418

4.5 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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Jones Racing Hustler 3-Blade Fans WP-9104-17-H3

Fan, Mechanical, Aluminum Hub, Plastic Blades, 17 in. Diameter, Each

Part Number: JRP-WP9104-17-H3

5.0 out of 5 stars ( 2 )

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: Aug 11, 2025 if ordered today

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Estimated Ship Date: Aug 11, 2025 if ordered today

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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Derale Hi Performance Stainless Steel Flex Fans 19118

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

Part Number: DER-19118

5.0 out of 5 stars ( 9 )

Estimated Ship Date: Tomorrow

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Derale Heavy-Duty Flex Fans 17013

Fan, Flex-Type, Heavy Duty, Clockwise, 13 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each

Part Number: DER-17013

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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Derale Hi Performance Stainless Steel Flex Fans 19317

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

Part Number: DER-19317

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Tomorrow

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Allstar Performance 4-Blade Steel Fans ALL30105

Fan Blade, Steel, Black, 18 in. Diameter, 5/8 in. Pilot, Each

Part Number: AAF-ALL30105

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Tomorrow

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Scott Drake Fan Blade Assemblies for 1965-1970 MUSTANG - C5ZZ-8600-C

Fan, Mechanical, 5 blades, Clockwise Rotation, Steel Hub, Black, 17.00 in. Diameter, Ford, Each

Part Number: SDK-C5ZZ-8600-C

4.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Goodmark Mechanical Cooling Fans GMK401031264

Fan, Mechanical Cooling Fan, 5 Blades, Clockwise Rotation, Black Steel Blades, 3 in. Bolt Circle for Fan Clutch, Chevrolet, Each

Part Number: GMK-401031264

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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