Why does the car AC make a buzzing sound after turning off the engine in summer?

1 Answers
Corey
07/30/25 8:16am
It is normal for the car AC to make a buzzing sound after turning off the engine in summer. This is to prevent the engine from seizing due to rapid cooling after shutdown. After driving for a while, various components of the engine reach high temperatures. If the engine is turned off immediately, parts like the cylinders and piston rings, crankshaft and connecting rods may stick together due to the high temperature. This can lead to a phenomenon known as "seizing" or "bearing failure" upon the next startup. Solution: If you have been driving for a long time, it is best to let the car idle for a few minutes before turning off the engine, allowing the engine temperature to naturally decrease. Precautions after turning off the engine: Cars have many external devices, and often people continue charging their phones or listening to music after turning off the engine. These activities drain the remaining power in the battery. If the battery is completely drained, it may result in the car failing to start.
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