Sorry for what is probably a stupid question but here goes.

During the past winter noticed after parking at work during a cold/snowing day that a large amount of steam seemed to come out of the kidney grills and front end. Figured it was slush/snow packed up under the engine block from the drive in. Had the dealer check and all was well with radiator (pressure tested etc). Then a couple days ago arriving home from work on a wet day noticed a decent amount of steam coming out again after parking...

no other car I've owned has shown this (that I've seen)....is this something any one else notices? I have no warning lights/temp lights, the car is a 2006 CPO 530Xi and has about 38K miles....I'm the second owner. Thx for any thoughts....I'm not concerned just have some down time here at work! :P