+1

Mine has pretty much ALWAYS been low on coolant. The radiator level is fine, but my overflow is always near empty. Only time I overheated was when I had bubbles in the line. I really wouldn't be too concerned with it right now, but I do understand your concern over, "where is it going?" On occasion, I actually find a small trickle of greenish fluid right on top of the radiator near the cap. No little in fact that I just look the other way.