I tried to top off my washer fluid reservoir last night and it started leaking out somewhere eventhough the level was a good 6" below the cap. I've never been in any freezing weather that would cause the tank to crack and I've only filled it up once before and don't remember how full I filled before. I checked the manual and all it said was "Add fluid to fill the reservoir if the level is low. In very cold weather, do not fill the reservoir completely." I don't know if by design you can't fill it up all the way, or mine is defective.
Can some please fill theirs up and see if it starts leaking before fluid runs out the filler?