I had a cat that kept getting under the hood of the car, so I put a set of socket wrenches and a box of spark plugs on the engine and told the cat to get to work if he was going to be under the hood. He never got under the hood again. (I couldn’t rssist this one).
I did find a kitten in our garage one evening 12 years ago that must have come in under the hood of the car. We have an attached garage and the door is always closed except when we run the car in or out. I managed to capture the kitten, and we fed the kitten, who was really starved. I placed an ad in the lost and found of the newspaper and canvassed the neighborhood with no response. The cat became a part of our family and is still with us.