What do I check to determine coolant loss and overheating 2004 Pontiac grand am

You mention the car loses coolant - where? Is there an external leak you're seeing? Or is it more like you don't know what's happening but are assuming the coolant is going away? Sure, there could be an internal engine coolant leak, but I'd really check closely first at all areas of the cooling system Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops