I went and got my oil changed in my 2005 Dodge neon and the mechanics told me that my coolant reservoir was empty. I put coolant in it this morning and then there was a puddle. I slowly just added to see where the coolant came out of and the is a hole in the back of the tank that it came out of. It sort of lines itself up with the full mark on the other side but is it suppose to be "plugged" or is it there so dummies like me don't overflow the tank? If I could take a picture of what I'm talking about I would but the tank is in an awkward spot.