1994 850 radiatior leak

[Philabella1]

Hi,

I have a 1994 850 with about 140K miles, had it about 9 months. A few semi-minor repairs but overall very happy with it. Over the the summer, I noticed a slight leak in coolant but just kept an eye on it and topped off. Now that the weather has gotten really cold, the slight leak has changed to a BIG leak. I'm going to take it in to a shop in the next couple of days, but any thoughts on whether this might be a big or small problem?

TIA!