[EC900]

Definitely seal up the fan, rodents will nest under the shroud. If you don’t intend to drive or start up the engine - Remove and store the battery too, DON’T use a battery tender….these units generate heat and rodents will take up shop in the trunk and stop at nothing to get at that heat source or as near to it as possible. It’s a good idea to use snap traps and/or glue traps inside garage. Keep these along walls and check periodically now and during the winter. I place them inside narrow cardboard boxes (like a roach motel) so the dog doesn’t go snoop.
This is the time of year mice will be hoarding rations and seeking warmer confines, expect them to enter anytime you open your garage door. Yes, they’ll wait by the door, they can detect the warmer interior and generally stage up along the wall that gets most of the sun. I’ve seen mice in the dead of Chicago winter munching at the bird feeder. Preventing them from entry is foremost, once inside they’ll nest somewhere and eventually come and go looking for food - so trapping is essential.