Oh is this normal, i have had it quite a few times over the last few months. At first i thought it was just some snow foam burning off as it always tended to be when i washed it, then i thought i had a coolant leak as i had to top it up a bit, but now i am wandering if its just another RS trait to go along with the squeaky brakes. I booked the car in for a service today and have asked them to investigate, but maybe no need.