A dream featuring a garage is there to remind you of the qualities and skills you have to call upon when required. It could imply that you are setting goals for yourself or planning for something.
A dream where a garage is full and cluttered implies that you are facing many things simultaneously in your life, or you are feeling unprepared for what's ahead.
If you empty out a garage then it suggests that you are moving on from old ideas or approaches that are no longer needed or working for you.
To be at a car repair garage suggests that you need to take more care or pay more attention to some aspect of your life or your body.