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Early (2013+) Ford Escapes have an air door right in the middle of the firewall. It has a light spring to keep it shut. Chipmunks and mice can push it open to get in, but then they can't get out. Oh the hillarity that ensues. The nuts make a lovely sound when they get caught in the blower fan (and there's a good reason it's called a squirrel cage). We used glue traps to catch them some place where they were easier to dispose of when they died and stunk up the car, only to find that mice are little cannibals when the need arises. I eventually fabricated a wire mesh screen to keep the little suckers out after laying on my back for two hours to get the blower assembly out (you're supposed to remove the entire dash first, but a few mirrors, magnets and extensions can get around that) There's nothing quite like having dead rodents, nuts and bedding rain down on your head.

The little devils also chewed the wiring harness for the rear differential in multiple places, disabling 4wd, traction control, and ABS. I had to splice in a foot of wire to fix it because there were so many chew marks.