They help keep your engine cool.
A fan clutch is hydraulic coupler that controls your engine's fan. It can engage and disengage the fan from the one of your drive belt pulleys - typically your water pump pulley. As the temperature of your engine increases it engages more firmly which in turn pulls more air through the radiator to cool off your engine. This helps to prevent your engine from overheating.
The great thing about a fan clutch is that is can increase your fuel economy due to the ability to disengage when it's not needed. When you are cruising and your engine is cooler it can disengage. When your engine is under load again it will re-engage when your engine needs to be cooled off to maintain proper operating temperatures.
They are more reliable on certain vehicles than the electrical fan counterpart that many vehicles have now. The mechanical fan that the fan clutch drives provides more air flow which keeps your engine working at optimum temperature. We find most fan clutches on modern vehicles are on diesel pickups and other larger engines.
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Happy Adventures,
Heather
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