Yesterday we were coming home in our 2002 caravan with rain and snow beating down really hard. When we got home we stopped to pick some stuff up at the store and I noticed the grill steaming. Not much, and rather uniform (across the entire grill, not localized). The temp was fine according to the dash and we had lots of heat all the way home.
This morning I checked under the hood and under the vehicle and didn't see any proof of a leak, the resevoir still had some antifreeze in it and removal of the rad cap showed it was topped up. Giving the lines a squeeze lowered it about 1/2 a cm.
We're rather new to this vehicle and I'm wondering (hoping) if it was simply rain and snow entering the rather large honeycomb grill and evaporating on the rad?