I have an 87 190d and lately the amber colored light for the fluid level has been coming on, and I spoke with my technician and he said it wasn't a really big deal, and to just fill the antifreeze tank with water. Well I am living out of town right now going to college, and I can't get back to get it checked out...SO...I'm a bit worried because everyday I fill the tank up with water, and then I drive it and about a half hour into driving it the light comes on again. I am pretty sure it has a leak in it, and my dad said he had noticed it as well. Is this a big deal...do any of you know what I can do to keep my car from acting up...? It isn't really affecting the drivability of the car, but I am really worried that it is going to overheat or something if I drive it back to my parents which is 90 miles away....HELP PLEASE!!!!!!!