If the heater core leaks, will it leak via ac drain?

When the AC is on, it seems it is leaking coolant towards the middle of the engine. 20 miles of driving, coolant level reduced like 1/2" on the red stick in the expansion valve. Is this the heater core leak? Also it have a smell when the ac on. I cant distinguish if it is R134a or coolant. When i did the ac repair, checked the evaporator and there was no leak and also did the vacuum check on system. Also the R134a the pressure is still same, assuming no leak. So it is the leaking coolant making this smell? Car is 2000 Z3 2.3. If the heater core leaks, will it leak via ac drain?

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[Kerry at Pelican Parts]

Yes it will leak out of the drain when the coolant level is overflowing in the HVAC housing

- Kerry