Chevrolet India — coolant exhaust in my 2010 lt model

Address: Karur, Tamil Nadu, 639001

There is problem to continue in my car Chevrolet beat 2010 LT model, coolant exaust and engine heat upnormal conditions.
First they told it was thermostat problem we rectify it..
Secod time, same problem came they told it was due to Connecting hose problem we solve it.

Third time same issue acquire, they told it was water pump probem. You change the pump.??
What is the real solution for this issue.