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How Long Can a 24V Car Fan Run After the Engine is Turned Off?

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StJohnny

07/29/25 6:29pm

How Long Can a 24V Car Fan Run After the Engine is Turned Off? A 24V car fan can typically run for 3-4 hours after the engine is turned off, depending on the battery's remaining charge. Below is some relevant information about using a car fan: Cooling Function: The fan in a car serves a cooling purpose. After parking, if the coolant temperature is too high, the vehicle's computer will automatically calculate the fan's speed and duration. The higher the temperature, the longer the fan will run to protect the engine. Fault Issues: If the fan continues to run for an unusually long time even after the engine temperature has dropped, it might be due to a loose electrical connection. In such cases, you can try unplugging the fan's wiring harness to cut off power separately.

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Rafael

08/14/25 11:26am

How long a car fan can last after the 24V system is turned off depends on your battery capacity and the fan's power. As a car enthusiast who has modified my own fan, a small fan typically consumes about 50 watts. With a 100 amp-hour battery, it can theoretically last around 40 hours. However, if it's a larger fan, say 150 watts, it might only run for about ten hours before giving out. In reality, factors like battery aging and temperature can shorten this time. I recommend not overusing it to avoid draining the battery, which could make starting the car the next day difficult. It's best to limit fan use to a few hours when parked and consider carrying a portable power source or checking the battery's health. This way, you can enjoy the cool air without any hassle. Of course, for short breaks, like half an hour, it should be fine—safety first!

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DelAdriel

10/14/25 6:22am

I've driven trucks for many years, and using a 24V system fan after shutting down requires careful calculation. Common battery capacities range from 80 to 150 ampere-hours. Assuming the fan power is 100 watts, the current drawn would be just over 4 amps, meaning it could theoretically run for about 20 hours. But don't count on the full duration, as older batteries might only last half that time. Leaving the fan running while parked can easily drain the battery, causing starting issues, especially during long-haul drives. I usually limit usage to just a few hours and turn it off promptly. For extra safety, you can use a backup generator or vehicle charger to extend the runtime. Remember, maintaining your battery is crucial—check the voltage monthly to prevent fan power consumption from becoming a headache.

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