I simply took it for a radiator wash, asked the guy to check for leaks while washing. He did wash it and told me about a leak in the thermostat. I asked if he can fix it. He said yes for qr300.... I couldn't believe but worth trying...
I never had any overheating again....
The crook at barwa wanted 7000 and 5000 upfront ! He wanted to change all the hoses, radiator, water pump....