If your auto get problem related to mechanical, it is not covered under the comprehensive or collision but the repairing of the car is covered under the Rental Reimbursement coverage.
If your auto get damaged and need reparation in the garage for more than one month the Rental reimbursement coverage will expand the limits of the reparation period for maximum 30 days or the amount whichever is maximum. By that time your claims provides rental car if you need. The Rental Reimbursement Coverage gives coverage of $75 per day for maximum 30 days if the auto is covered for physical damage.
In all state of US, if your auto get under repairation you will be able to rent a auto comparable with your own auto. It is advisable to fix up the rental However, you should always consider your rental compensation limits for selecting a rental vehicle. The rental auto rates are on daily basis, if your rental auto rate are higher than you will have to spend extra money from your pocket. If you know your auto takes more time means more than 30 days than you must have to do the agreement with the rental car vompany to get the lower rate so that you have to spend less money.