I'm in Chicago, and it's cold. I haven't really used the windshield wiper fluid until recently, and after pushing in the button (both light and deep), nothing happens other than move the windshield wipers across the dash. I checked the fluid and topped it off, which was almost full. Does anyone know if the wiper fluid channel gets frozen easily, or is this broken? Initially I thought it might be frozen, but I'm in a garage, and temperatures are not at freezing levels, so i'm thinking that something else is not working correctly. Anyone have any tips or have similar issues? I don't want to make a service appointment if possible since the last time I did so, it took 2 months to finally get in.