Problem

Greetings I have reheating problems in a Grand Vitara 4x4 year 2006 Autom 6 CIL, when it is turned on, but when you turn off the engine the radiator water is returned to the filling tank and spills through the breathing until it reaches the point of emptying the radiator completely.
You could inform me that or what is the problem that my truck presents that has given me a lot of headaches is barely 58,000 km and I have already changed the two plateaus because the stumps do not break alone, the front mositos, the shock absorbers, the tensioning bar and now this pod.
Thanks for your answers to all who help me.