The water from the radiator bottle of my 1000 cc EFI engine car is evaporating very quickly. I fill the bottle to max level. Drive 20 kms with AC on and then check the radiator bottle and it's almost empty again. Meaning about 1 litre of water evaporated in 20 kms drive with AC on. There is no leakage.
Mechanic thinks "head gaskit" needs work.
What do you guys think may be the problem? And what kind of cost should I be expecting to pay to get it fixed?