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 440

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 ( 105 )

Estimated Ship Date: May 7, 2025 if ordered today

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Estimated Ship Date: May 7, 2025 if ordered today

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Derale Hi Performance Stainless Steel Flex Fans 19117

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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

4.92 out of 5 stars ( 83 )

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Derale Clutch Fans 17117

Fan, Clutch-Type, Clockwise, 17.250 in. Diameter, Steel Blades/Hub, Universal, Each

Part Number: DER-17117

4.77 out of 5 stars ( 60 )

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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

3.67 out of 5 stars ( 6 )

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Derale Clutch Fans 17118

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

Part Number: DER-17118

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Goodmark Mechanical Cooling Fans GMK4012312681

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

Part Number: GMK-4012312681

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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

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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 )

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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

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Derale Clutch Fans 17119

Fan, Clutch-Type, Clockwise, 19 in. Diameter, Steel Blades/Steel Hub, Universal, Each

Part Number: DER-17119

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OER Mechanical Cooling Fans K193

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

Part Number: OER-K193

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Allstar Performance 6-Blade Fans ALL30103

Fan Blade, Steel, Black, 17 in. Diameter, 5/8 in. Pilot, Each

Part Number: AAF-ALL30103

5.0 out of 5 stars ( 18 )

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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

4.5 out of 5 stars ( 4 )

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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

4.79 out of 5 stars ( 24 )

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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

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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

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Flex-A-Lite Flex Fans 101567

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

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Allstar Performance 6-Blade Fans ALL30100

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Part Number: AAF-ALL30100

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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: May 5, 2025 if ordered today

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Derale Heavy-Duty Flex Fans 17618

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

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Derale Rigid Race Fans 17317

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

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Flex-A-Lite Wide Blade Flex Fans 105495

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Derale Clutch Fans 17917

Fan, Clutch-Type, Counterclockwise, 17 in. Diameter, Steel Blades/Steel Hub, Universal, Each

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3.92 out of 5 stars ( 12 )

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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

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Scott Drake Fan Blade Assemblies for 1964-1973 MUSTANG - C6ZZ-8600-C

Fan, Mechanical, Extra-Duty, 6 Blades, Steel Hub, Silver, Clockwise Rotation, 17.00 in. Diameter, Ford, Each

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4.93 out of 5 stars ( 14 )

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