About a week after I bought my new Wrangler, (not having owned one before), I had just gone through a pretty rough Ice storm.
That morning, I cleared all the ice off the vehicle that I could, in a self-spray car wash, and drove it to work.
When I parked in my spot and sat there idling for a moment, I noted steam coming from under the hood, (like it was with an old car of mine years ago, with a radiator leak), and became concerned.
I looked all over and found no leak, so I presumed that the water I had been spraying all over the radiator area, front end, hood, and so forth, must be burning off of the hot motor.
Interesting that you should point out this experience, as it matched mine.
Perhaps the over-exposure of the motor, compared to say a Lincoln Towncar's motor compartment has something to do with it?! I even had started another thread in here about the exposure to sleet build up in the Windshield Wiper compartment, perhaps due to that "over-exposure" factor?.