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What is the reason for the continuous rotation of the EA888 third-generation fan?

2 Answers

McHenry

07/28/25 10:29pm

First, purge the air inside the engine. If the fan continues to run constantly, replace the water pump again. Impact on engine lifespan: The cooling fan is a crucial component of the vehicle's cooling system. The performance of the fan directly affects the engine's heat dissipation efficiency, which in turn influences the engine's performance. If the fan is improperly selected, it can lead to insufficient or excessive cooling of the engine, worsening the engine's working conditions and thereby affecting its performance and lifespan. Components of the cooling system: The cooling system of an automobile engine is a forced circulation water-cooling system, which uses a water pump to increase the pressure of the coolant, forcing it to circulate within the engine. The cooling system mainly consists of the water pump, radiator, cooling fan, expansion tank, thermostat, water jackets in the engine block and cylinder head, as well as auxiliary components.

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NatalieLee

08/12/25 3:00am

My Volkswagen EA888 Gen 3 engine fan keeps running non-stop, and I've personally encountered this issue. Possible causes include insufficient or leaking coolant, causing the engine temperature to rise excessively and triggering the system to automatically activate the fan for cooling. If a sensor, such as the coolant temperature probe, malfunctions, it may falsely signal high temperature, prompting the ECU to run the fan continuously. Additionally, common culprits include a stuck thermostat, a faulty fan relay, or a clogged radiator. When I fixed my car, I found the sensor's resistance value was out of spec—replacing it solved the problem. Ignoring this issue can increase fuel consumption, damage the engine, or even lead to a breakdown. I recommend first checking the fluid level and topping it up with distilled water if low; for serious cases, visit a professional shop for diagnosis and part replacement.

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