I store my 84 Capri RS 5.0 in the garage, and only drive it on nice summer days. In the winter, I leave the hood open so I can check on any critter activity (nests, etc.). When I pull the car out of the garage in the spring, the first thing I do is turn on the heater/defroster fan. One year I was showered with bird seed coming out of the defroster vents. This year the heater fan didn't work. Probably just a fuse, and I'll replace it one of these days. Yesterday, I noticed some pink fiberglass insulation on the floor under the heater. I have a roll of fiberglass insulation in the rafters of the garage, and I figured the mice had built a nest in the blower motor causing the fuse to blow. I agonized over this ultimate PITA and wondered how much I would have to take apart to clean out the heater/fan. Today, just for fun, I turned on the heater fan and it worked! The gods have smiled on me!
My message for the day: If you live anywhere where there are mice, chipmunks, or other critters, and you leave a car inside or outside for more than a few days, always lift the hood and check for nests before driving.
FWIW Dick