Thanks Mr Sleeper for your advised, yes yaah USTAD type mechanics naay waqaey bara masla create keyah howa haai in market.
Yes i will follow the steps now and will post the updates ASAP
Steps
1 - Check the Leakage \Blockages in the hoses of radiator check the radiator cap check the radiator fan.
2 - Check the water body pump.
3 - Check the thermostats.
4 - Drained the coolant.
5 - Flush the radiator with Flush liquid.
6 - Check the flow of water in radiator while car is on.
7 - In case if the above one didn't work then go for the radiator service and notice the behavior.
8 - Last option to change the radiator if water body pump and thermostat and hoses are good.
This is what i learned from here