The car started by over heating, and kept on saying check coolant and at same time it was making noise from the engine, After those things I took it to service, and they changed head gasket but while they were changing the head gasket, they found two gasket then they put a new one gasket, after putting that one new gasket the car was running fine until it says engine check after showing that sign then it starts to Mix oil and water, after mixing oil and water I took it to skimming but still do the same things, please help me out