Where is the added coolant going?Ours has never smelled or leaked. I would bet most don't, but that doesn't help your situation.
It's also worth mentioning for those new here that it's also perfectly normal for the coolant level to stay near (+/-) the MIN mark, and to mysteriously return to that sweet spot even after adding coolant. As long as you don't smell coolant, and it doesn't drop below its sweet spot, it's not leaking.