@xulfiqar yes flush with surf excel powder.
Service se phele b coolent dala wa tha.. service wale ne radiator service kar dia but cooling system ko bar bar flush nai kia or radiator open karte waqt porana wala coolent flush howa bus..
After radiator service us ne radiator wapsi laga dia or coolent with water mixture dala NASA ka.
Do din baad wese hi ma ne check karne k lia radiator cap hataya to dekha fully rust uper aye howi ha or pani niche ha..
Radiator service wala wash the coolong system with surf.. but how to clean properly.. pure water radiator ma nai a raha white white surf k particles a jate ha or kabi kabi green pani b.