Coolant smell when engine warm
 

I have an '03 V8 with 7000 miles. After driving and shutting the warm engine off, I can pick up a slight coolant smell coming from the engine compartment. Twice now I have smelled it while driving. Is it normal to smell coolant once in awhile? I have not added any coolant to the reservoir or in any way monkeyed with the cooling system. Any suggestions??