How Long Should the Fan Run After Turning Off the Engine?
3 Answers
It is normal for the fan to continue running for about 3 minutes after turning off the engine; if it doesn't stop after 5 minutes, it indicates an issue with the cooling system. Additional Information: In modern vehicles, the fan is controlled by the computer based on voltage signals from the coolant temperature sensor, which regulates the engagement and disengagement of the fan relay. After turning off the ignition switch, the fan's power supply is also disconnected, so the fan stops working. Check the following points: Whether the thermostat opens normally. Whether the radiator surface is covered with dirt or internally clogged. Whether there is a lack of coolant. Issues with the water circulation system, such as a faulty cylinder head gasket or water pump. Problems with the fan control system, such as a stuck relay or temperature control contacts.
It's quite normal for the fan to keep running after the engine is turned off, usually for about 1 to 3 minutes, and it shouldn't exceed 5 minutes at most. This happens because the engine temperature remains high after driving at high speeds or in hot weather, and the fan needs to continue working to help the radiator cool down, preventing the engine from overheating and getting damaged. My own car behaves the same way—after my daily commute, the fan runs for a short while and then stops. However, if I've been on a long summer road trip and then turn off the engine, the fan runs a bit longer. But if the fan keeps running for more than 10 minutes without stopping, there might be an issue, such as a stuck thermostat or a coolant leak, and it's best to get it checked immediately. Additionally, for hybrid or electric vehicles, the fan might still be cooling the battery, but the duration is similar. Don't panic in such situations—the fan will stop automatically once it's done, and it won't affect the vehicle's safety. In summary, if the fan stops within a few minutes under normal circumstances, there's no problem. If it exceeds that time, it's advisable to visit a repair shop.
As someone who frequently drives long distances, I think it's normal for the fan to run for a while after turning off the engine, usually just a few minutes. This fan is actually part of the car's cooling system. Even though the engine is off, the temperature remains high, so the fan continues to run to dissipate heat and prevent damage to internal components from overheating. For example, with my old car, every time I drive on the highway and turn off the engine, the fan hums for two or three minutes; after short trips, it usually stops within a few dozen seconds. However, if the fan runs for too long, exceeding 5 minutes, or doesn't run at all, there might be a problem, such as clogged cooling ducts or an electronic system error, and it should be repaired promptly. Weather also has a big impact—the fan might run less in winter and longer in summer. Beginners might find it strange, but don't worry, it's designed to protect the car. For regular maintenance, you can periodically clean dust near the fan to ensure smooth heat dissipation. Safety first—if the fan behaves abnormally, don't force the car to run; wait until it stops spinning before driving.
