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Which Vehicles Use Viscous Fans?

2 Answers

Fitzgerald

07/24/25 2:49pm

Vehicles equipped with viscous fans are mostly off-road vehicles, trucks, semi-trailers, and heavy-duty trucks. Here is some information about viscous fans: 1. Most passenger cars use electric cooling fans. If the fan fails, it will affect the radiator's heat dissipation, leading to excessively high coolant temperatures. 2. Therefore, heavy-duty trucks, semi-trailers, and off-road vehicles use more reliable and durable viscous cooling fans. If a viscous fan fails, the shaft can be fixed directly, allowing the fan to continue rotating. The viscous fan contains a viscous clutch in the center. When the temperature rises, the viscous clutch engages, enabling the fan to rotate and cool the radiator.

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KylieLee

08/11/25 8:31am

Speaking of viscous fan clutches, I've studied quite a few when working with classic cars. Iconic examples include hardcore off-roaders like the Land Cruiser LC80 and LC100, especially the Middle East versions. The old Pajero V33 and V43 models were also common users. Among American vehicles, the Dodge Ram 1500 pickup frequently used them, particularly the 5.9L engine variants. In German cars, the BMW E39 540i with M62 engine came factory-equipped with viscous fan clutches, and the E46 M3 also used them. While rare in modern vehicles, the Toyota Tundra TRD Pro and certain batches of Jeep Wrangler Rubicon still retain this design. Off-road enthusiasts particularly enjoy retrofitting viscous fan clutch kits to Land Cruisers and Nissan Patrol Y60s - they provide reliable cooling when desert running.

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