i changed my thermostat and sensor and now the car keep leaking coolant

Hello, It sounds like you already know what the problem is, and there are two things you can do. 1. UV dye for the cooling system, and a UV light so you can watch the coolant leak. 2. Contact one of the shops from the link below, and get it taken care of: http://repairpal.com/mercedes-benz-within-10-miles-of-mableton-georgia- Either way, I'm here to help, so let me know if questions come up.