coolant smell?

Sometimes when I raise the hood on my 2002 Intrigue (with 40000 miles), I think I smell just a whiff of coolant - maybe it's my imagination. The level in the bottle doesn't go down, and I can't visually see a leak on the ground or by looking on top. Anyone here had any radiator issues? Any ideas?

Upper and lower intake gaskets had to be replaced on mine for this.