Easy quick and dirty method to finding the issue is to fill the tank with water, since you do not need to waste coolant yet. Then run the engine and find the leak, but make sure to watch the coolant level and temp. On a cold engine you will not kill anything, but do not let it run forever. You should be able to find the leaking point in a matter of minutes. That coolant is sprayed all over due to the belts and other moving parts throwing it. So the leak is most likely the pump or somewhere near it, where coolant can leak directly onto the belt or pulleys. Could be a pin hole in the radiator as well spraying on the belts or pulleys. Best way to find it though is to top it off and run it for a few minutes til you spot the leak. Then fix the problem and refill.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....