If no leak in few days time, i recommend send to flush, and fill it with 50% coolant + 50% distilled water (can use battery water or air suling in supermarket), or those premixed coolant. Most mechanic use tap water because they worried if there's leak then your coolant wasted already.

Using pure coolant will reduce the boiling point of your radiator content to that of alcohol, means that your water pump will work harder to remove specified heat from engine, compared to those 50/50 coolant-water mix. Something like that.

On the side note actually pure water works well for Malaysian weather also. But we need the rust inhibition function of coolant.

Yeah... Don't expect any workshop will give you distilled water.. Is the norm in market. I always bring my own distilled water.