How long can you run the fan without starting the car?
2 Answers
Generally, it can last for 30 to 45 minutes. Some cars with better battery performance can even run for up to an hour without issues. 1. Reduced battery lifespan: However, this is not recommended as it can damage the car's battery and shorten its service life. When the engine is not running, avoid sitting in the car for extended periods using electronic devices, as this will also reduce the battery's lifespan. 2. Battery: The battery is a wearable part that requires regular replacement. Over time, its performance will degrade, and failure to replace it may result in the car failing to start. When the engine is off, the battery powers all the electronic devices in the car and is also responsible for starting the engine.
From a safety perspective, I have personal experience with this issue. When only the fan is turned on without starting the engine, the fan is powered by the car battery, which is primarily designed for starting the engine and has limited capacity. With a new battery, running just the low-speed fan might last over three hours, but using the high-speed air conditioning fan could drain it in one or two hours. My car battery, which was four years old and aging, struggled to start after running the fan for less than half an hour during a winter meeting, nearly requiring a tow truck. If the battery is completely drained, even emergency lights may fail, increasing the risk of accidents. I recommend not exceeding half an hour, especially for older cars with weaker batteries or in extreme weather conditions where power drains faster. The safest approach is to start the engine before turning on the fan to avoid the hassle of breaking down midway. Regular car maintenance should include checking the battery's lifespan.
