My Mother stopped driving for months due to dementia. She lived on a farm. Luckily I opened the hood before starting it. Mice had the air filter housing completely stuffed with bedding. Some wire were nearly chewed in half, and every blade on the plastic radiator fan had about 2" chewed off the ends. EVERY BLADE ! Actually it was lucky that it was every blade, as it was drivable after cleaning and repairing wires.
I like this mouse trap, but have never built one.