Originally Posted by KyDan
I found some displaced insulation (fiber glass) under my hood when we got home. I have no idea if it was rats or maybe a mechanic at some earlier time.
Likely it was pack rats. We live year-round in Arizona and pack rats are fond of insulation as well as wiring. We've had two different vehicles with insulation damage, and have seen several vehicles in our park with major damage. Two vehicle repairs that we know for sure had $4500+ worth of damage and the other $3500+. So taking action ahead of time is advised.
A couple of years ago, we started using "rat" traps - not mouse traps and were able to eliminate 9 of them in a short period of time. We now set them all the time (have to remember to remove them before driving).
Prior to the traps we tried lights, chemicals, and a host of other ideas but in the end it was the traps that prevented anymore damage. Of course we were already having the infestation before trying any of the aforementioned methods, so lights may work for you.
Welcome to Arizona (winter or year round), we love it here in spite of this minor inconvenience. Safe travels...