I have a 2003 Passat SE TDI 130 4motion and noticed today that the windscreen jets were frozen for my entire 20 minute drive, even though i though it was supposed to have heated windscreen jets? When i arrived at my destination i checked them and they were cold to the touch, should they get warm enough to feel if they are working? Should i see water vapor coming from them like on the heated mirrors? Thanks for any advice!