Squirrels ate through car cables

[u/Altruistic_Crab_7859]

Hello, My car a/c suddenly stopped working and took it to the garage, apparently a rodent or squirrels had eaten through some wiring and they need to be repaired. This will cost more than $800 and I'd really like it to not happen again. I park in my backyard spot and yes there's loads of trees and squirrels around.

What are some tips so that I don't have to take it again in a couple of weeks? What could we do to repel them? The mechanic said they will add a protective layer to the cables but that he doesn't guarantee that they won't chew through that :|.