Yes? And while they're there, you don't want them to chew on the wires.
You can't prevent your engine from being warm (assuming you need to use your vehicles), but you can make it less appealing to gnaw on the nice chewy parts of it.
Rodents chewing through cables is a problem even in latitudes closer to the equator, where it can get hot enough that they don't (need to) seek an engine for its warmth.
