I've got an 87 that has been holding coolant just fine until around 2 months ago or so. Now I'm having to refill the reservoir once every couple weeks at least. And I don't drive it usually more than maybe 60-120 miles a week.
But... I've looked around a little and it's so slow that I can't see a leak (or maybe it's somewhere I can't see).
Where do I look?
Also, I know I probably can't mention the year 87 here without someone saying cracked head

so I give some background... the low coolant reservoir light has started coming on just recently with NO overheats. The temperature has never gotten above normal (80-100 C). So I don't think we have a cracked head. But just for some background... there's that.