Check around; there are rodent repellent sprays out there (I have to use them on the fender wells and the engine, especially the plastic trim around the air cleaner and the batteries) to keep squirrels out of the engine bay of my 6.6 Duramax. Learned that lesson the hard way - I was temporally at a point where I only used the truck one day a week, and a squirrel built a nest, ate a bunch of wires through and also ate half of a $450 sensor. You don't want to know the total repair bill, but I can assure you that a couple of spray bottles of animal repellent (which keeps most all rodents away) is a very small investment. Also had a squirrel eat through the gas line on my Jeep. I got Liquid Fence Animal Repellent at the local hardware store, and it has worked fine - no squirrels, chipmunks or mice. An even stronger one is Nature's Mace Squirrel Mace, which I had to mail order and which is very effective, and, in addition, besides the squirrels, chipmunks and mice, it works on raccoons, too. Get one of those soon, and reapply it every couple of weeks. Cheap insurance....