@Xulfiqar bhai,
I had a problem in cultus-11 where I changed my oem radiator last summer cuz car was overheating and now have Aluminium one. Also got hose pipes, heater pipes and long steel pipe changed.
Then one day my car got overheated in a crowded traffic and so went for computer checkup and no fault was found plus the fan was starting at the temperature that it should as per mechanic.
As far as the mechanics are concerned, all are of the opinion that head gasket is fine.
However still the water in the reservoir bottle gets almost empty after 1 week (about 40-50 km per day) from maximum level stated on side of the bottle.
No water leakage from either side underneath the car.
Still cant figure where does thw water goes ?
FYI
Water body was replaced about 2 yrs ago, average in city about 12-13 without AC and 17-18 on motorway, engine oil castrol magnetic 10w/40 with air filter replaced with oil change.
However, when engine starts it gives bit blue smoke for initial 3-5 seconds after that fine.
No oil leakage from beneath car.