" I would drain the coolant once and fill with distilled water. Do the water pump bleed then bring the vehicle to operating temp to open the thermostat. Then drain the coolant again ( I recommend letting the vehicle cool some first
), and fill with distilled water and water wetter. Bleed the coolant system again and that should remove almost all of the glycol.
You may have to look into the best way to drain the coolant system. I think I drained the radiator and also removed one of the hoses from the transmission cooler.
The reason you only should use distilled or de-ionized water is because all other water (tap water, bottled water, etc.) contains minerals. They actually add minerals to bottled water for taste. These minerals can build up in the cooling system and cause premature failure.
I think it is very strange that you are losing coolant. How much do you lose over time? "