my 2001 pontiac gran am, is leaking coolant where could it be leaking?

Thank you for your response mr Automan, but i have the right to be mad. I did take the car back and i had to leave it. They told me that the hose they replaced was leaking, but there is a quick release connector, which may be cracked which goes to the hose that they replaced. If the connector was damage they would charge me for the part not labor. It turned out that it was the connector, they gave it to me and it did not look cracked, they claimed to have check the coolant tank. thats my out come thank youuu