Back in January I had the coolant warning light come on. I checked, and there was almost no visible coolant in the tranparent plastic fill area of the radiator. I'd recently moved from VA to Huntsville, AL and don't have a good BMW-specific mechanic yet. So I called my guy in VA. He told me to top it off and if I didn't lose anymore that I was okay - something about being a typical trait after certain servicing I'd had done before moving. I did the deed, mixed some stuff up and topped it off. This last week I got the light again, and I checked and it was low - not like before, but still significant. After topping off again I started checking and I see that each day there are probably 3-5 big drops coming out on the garage floor.

Is there something I can do, some additive, for plugging a tiny hole? Or do I need to look at having the radiator replaced? I have to verify this (at work now), but I think the radiator is original.

Thanks!
Eric