Some funny smell from 225 (coolant)

ive had some cars that couldnt keep full, let it be at a quart or 2 low and it stay right there for years but fill it to the rim it lose a quart or 2 every few days!
Update: I was driving it like 100 miles and the coolant level was a bit higher than min. when we started and kept being on that level the rest of the journey.