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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 429 Items.
Fan, Flex-Type, Heavy-Duty, Clockwise, 18 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each
Part Number: SUM-G4918
Estimated Ship Date: Today
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Fan, Flex-Type, Heavy-Duty, Clockwise, 17 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each
Part Number: SUM-G4917
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Fan, Flex-Type, Wide Blade, Clockwise, 19.312 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each
Part Number: FLX-105496
Estimated Ship Date: Today
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Fan, Clutch-Type, Clockwise, 18 in. Diameter, Steel Blades/Hub, Chevrolet, GMC, Each
Part Number: GMK-4012312681
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Fan, Clutch-Type, Clockwise, 17.250 in. Diameter, Steel Blades/Hub, Universal, Each
Part Number: DER-17117
Estimated Ship Date: Today
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Fan, Clutch-Type, Clockwise, 18 in. Diameter, Steel Blades/Hub, Universal, Each
Part Number: DER-17118
Estimated Ship Date: Today
Estimated Ship Date: Today
Fan, Flex-Type, Wide Blade, Clockwise, 18.25 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each
Part Number: FLX-104803
Estimated Ship Date: Today
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Fan, Clutch-Type, Clockwise, 18 in. Diameter, Steel Blades/Hub, Chevrolet, GMC, Each
Part Number: OER-K193
Estimated Ship Date: Today
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Fan, Flex, Mechanical, Clockwise, 16 in. Diameter, Stainless Steel Blades/Steel Hub, Each
Part Number: FLX-101254
Estimated Ship Date: Today
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Fan, Flex-Type, Heavy-Duty, Clockwise, 15 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each
Part Number: DER-17015
Estimated Ship Date: Today
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Fan, Flex-Type, Wide Blade, Clockwise, 18.25 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each
Part Number: FLX-104483
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Blades,1971-79 Fan Blade 19-1/2 in., 7 Blade, Each
Part Number: OER-3991431
Estimated Ship Date: Today
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Fan, Flex-Type, Wide Blade, Clockwise, 17 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each
Part Number: FLX-104482
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Fan, Flex-Type, High Performance, Clockwise, 15.250 in. Diameter, Stainless Steel Blades/Steel Center Hub, Black, Universal, Each
Part Number: DER-19115
Estimated Ship Date: Today
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Fan Blade, Steel, Black, 17 in. Diameter, 5/8 in. Pilot, Each
Part Number: AAF-ALL30103
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Fan, Flex-Type, Wide Blade, Clockwise, 17 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each
Part Number: FLX-105495
Estimated Ship Date: Today
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Fan, Flex-Type, Wide Blade, Clockwise, 16 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each
Part Number: FLX-104801
Estimated Ship Date: Today
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Fan, Flex, Counterclockwise, 18.250 in. Diameter, 6 Blade, Stainless Steel, Silver, Each
Part Number: FLX-106278
Estimated Ship Date: Today
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Fan, Flex, Counterclockwise, 17 in. Diameter, Stainless Steel, Silver, Each
Part Number: FLX-102113
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Fan, Clutch-Type, Clockwise, 19 in. Diameter, Steel Blades/Steel Hub, Universal, Each
Part Number: DER-17119
Estimated Ship Date: Today
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Fan, Flex-Type, Heavy-Duty, Counterclockwise, 18 in. Diameter, Stainless Steel Blades/Steel Hub, Universal, Each
Part Number: DER-17618
Estimated Ship Date: Today
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Fan, Clutch-Type, Counterclockwise, 18 in. Diameter, Steel Blades/Steel Hub, Universal, Each
Part Number: DER-17918
Estimated Ship Date: Today
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Fan, Flex, Mechanical, Clockwise, 17 in. Diameter, Stainless Steel Blades/Steel Hub, Each
Part Number: FLX-101567
Estimated Ship Date: Today
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Fan, Mechanical, Extra-Duty, 6 Blades, Steel Hub, Black, Clockwise Rotation, 17.00 in. Diameter, Ford, Each
Part Number: SDK-C6ZZ-8600-C
Estimated Ship Date: Today
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Fan, Rigid Style Race, Steel Blades, Standard Rotation, 18 in., 2.25 in. Depth, 8,000 RPM Rated, Each
Part Number: DER-17318
Estimated Ship Date: Today
Estimated Ship Date: Today
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