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Here is some more info I found to help: Source: howtopreventratsfromeatingcarwires.com

RAT BEHAVIOR
-Rats are habitual. They like to run along the same paths, eat at the same places (2-3 places), eat the same foods, etc. This is even true to the extent that if a rat has a normal path that typically has an object in it’s way, even if the object is removed it will still run around it as if it were still there.
-Rats are very cautious. They will initially eat small chunks of a potentially new food source to determine whether it is safe or not. They cannot vomit so they will eat a small bit first to see if they get sick. Rats will also be deterred from places/situations that are not familiar. Paths that are marked as “safe” will have signs (e.g. rat droppings, rat urine, chewed up bits of paper/objects) that the other rats will look for.
Rats are sneaky. They prefer to stay concealed/in the dark and will always prefer to run alongside a wall or under foliage/covering.
Rats pee on EVERYTHING. This is their way of marking territory, showing that food is safe to eat or if this path is safe to take, etc. Rat piss is the equivalent of an identity card. Other rats can tell information about that rat based on the pee (age, gender, size, etc.). A rat nest would essentially glow under a black light.
-Rats have terrible eyesight. They rely on their sense of smell in order to determine if something is safe, and their whiskers to navigate their environment. Though they are limited by the clarity of their vision, rats can see ultraviolet light and this can help them in spotting their urine.
Rats are omnivores, meaning they will eat both plants and meats.
-Rat teeth will continually grow, so they are always gnawing on objects to try and keep them at a manageable length.
-Rats live in colonies of 8-15 and they can reproduce 6-8 new rat babies every 22-24 day! When weather shifts or food sources are scarce, alternative shelter may be sought out.
Now that we have a basic understanding of our enemy, we need to determine why they are taking shelter in your car.

Top 3 Reasons Why Rats Are In Your Car
-Nesting: They are looking for a new place to nest and the engine compartment of cars provide shelter and warmth. If this is the case, you will see bits of shredded objects in a nook or corner of the engine compartment. You will notice rat droppings as well and a black light would reveal a serious amount of rat urine.
-Chew Toys: As mentioned previously (in the enemy profile) rat teeth continually grow all their lives and the engine compartments of cars can provide tons of wiring and tubing that rats can enjoy to keep their teeth at a manageable length in a concealed environment.
-Food: Some cars have soy-based wiring, which can provide a nice snack for the rat.
Note: the vast majority of the cases will be from Nesting and Chew Toys