Sounds like this is not a warranty issue but if you do have a problem with something that normally would be covered have dealer check first because Hertz buys/leases some cars at a deeply discounted rate and they do not come with a warranty like a normal retail vehicle.
Couple years ago I picked a brand new Chevy Cruze 3 miles on it on a mutlimonth contract. After couple a days relized the AC didn't work took it to a Chevy dealership, it had cracked A/C Condenser that they said would be under warranty. They had it fixed a couple hours later then realized the car did not have warranty coverage on it. Had to fight tooth and nail with Hertz who finally reimbersed me a month later. They said I should of returned it to them because they buy the cars alot cheaper without warranties because they can fix it themselves cheaper.