Why do cats like to hide inside engines?
Cats like to hide in engine compartments to avoid the cold. The engine compartment of a car that has just been turned off is warm and common. Cats are flexible, and since the engine compartment is not completely enclosed, it is very easy for them to squeeze into it through the car chassis. Thus, the engine compartment becomes the best hiding place for kittens.
The engine compartment of a car that has just been turned off is warm and common. Cats are flexible, and since the engine compartment isn't completely enclosed, it's very easy for them to crawl under the car chassis. Thus, the engine compartment becomes the best hiding place for kittens. 
It's really cold outside.
Stray cats are quite wary, and the engine compartment of a car, which is not easily noticed, becomes their safe haven where they can rest peacefully. Many stray mother cats also like to use car engine compartments as birthing rooms, so in the minds of many stray kittens, a car is their den and refuge. Even as these kittens grow up, they will habitually hide inside motor vehicles.If you find a cat hiding in the engine, you can't drive the car directly.
It is true that some people will ignore a cat even if they find it under the hood and drive away, which is a very cold-blooded, irresponsible and dangerous act.If a cat falls out of the car while it's in motion, it's very easy for it to be run over. Even if a driver behind notices the cat, there's still a high risk of a traffic hazard if they brake suddenly to avoid it.
Even those cats that managed to avoid falling out weren't lucky. The engine temperature of a running vehicle would gradually rise, and the cats could be burned or even get caught in the engine belt and get injured or killed.
Besides the threat to the cat's life, if the cat unfortunately gets caught in the engine belt, it can also damage the vehicle, and the repair costs can be quite substantial.
So even if it's not for the cat, please think about your car and your wallet!
