Hi Scotty , I am back with another problem. My 2006 C230 sport had a small leak. I guess I put too much stop leak.Car started overheat. I have replaced chocked radiator , tested with new Thermostat . It is still over heating and builds so much pressure one side of upper radiator hose pops out. Car always blows cold air even car red hot , No heat. No leakage anywhere , coolant level is correct. What else to look ? Need help .