Originally Posted by IAHtraveler

Yup, you can as long as it's a car from a corporate location and you go to a corporate location. They typically give you the same car or same class so they aren't shorted a class. Even as a CHM, I've had difficulties upgrading upon swapping at a different location.

If you've got a car from a franchise location, you can have a mechanical issue ("tire losing pressure" etc) and they will swap it for you and make you fill out an incident report for the vehicle.