When i purchased my A4 the light for low water on my windscreen water bottle was on. Not thinking anything of it, i went to fill the bottle only to find the water pours on the ground. I found a hole lined with rubber that its flowing from 3/4 of the way down the side of the bottle. Can anyone help me as to what is ment to be in the hole? It still pumps to the washers but doesnt hold much water.