My mechanic told me it's gasket head problem that why water was boiling . so I have replaced gasket head. there was no face problem .
Now i checked the radiator and i can see still some bubbles while engine on. Mechenic said it's ok " itnay bubble atay hain but ab pani kam nahi ho ga " . also there is so timing belt noise which he said k " kuch time k bad belt adjust ho jae gi tu awaz kam ho jae gi " so far I have run 100 KM but still there is some sound of timing belt .
I also do not see any improvement in fuel efficiency or pick/acceleration.
Please let me know your expert opinion.