1991 190E 2.3 8v WAS leaking coolant?

[DRAZAH]

Hey everyone, just picked up a 1991 190E with about ~100k miles.

The last owner told me a lot of stuff was replaced already and included all of the receipts of the work. The water pump was replaced about 2 years ago (~15k miles).

Upon bringing it home, I took the bottom plastic guard off and noticed that some coolant was pooled up in it. It looks fairly fresh, very green and couldn't notice much oil other then residue thats been caked onto it.

Suspecting a leak, I left the cover off and ran the car for a little and drove it around the block. It never got close to overheating, It would hit the "80" mark on the thermostat and just about hover there, going slightly over if I let the car sit without moving. Fans always kicked on and off.

I checked under neath the car when I got home and noticed a decent drip of green coolant coming from the oil pan. Didn't notice any oil mixed in, but it seemed to be dripping from the oil pan bolts.

Raised her up and tried to clean as much as I could underneath to find the source of the leak, there was a decent amount of oil residue and coolant in places but I'm assuming this has been missed from the previous owner.

I decided to wrench the oil pan bolts a bit tighter, some were snug but others I could tighten a little bit with mild force. Wiped down everything again and decided to run the car again and go drive it around for ~10 minutes.

Ran the heat on high for some time also.

Upon getting back home, there seemed to be absolutely no coolant leaking from the oil pan anymore. Before it was a somewhat steady drip as the car was hot and stopped when it cooled. This time, there was nothing. However, I could notice a faint coolant burn (sweet smell) but not sure if this was just residual coolant left that was burning off or if tightening the bolts caused the coolant out somewhere else?

I suspect it's the water pump (or was?) but really have no experience with these cars or engines so just looking for some insight.

TL;DR = Was dripping coolant from oil pan/oil pan bolts, tighten the oil pan bolts and now it's not leaking anymore, but could smell a slight coolant burn sweet smell after driving around.