I've noticed lately that the driver's side seatbelt feels damp after a hard rain. Seals around door at B-pillar show no leakage and seem fine. No drops of water noticed around rear left window. Replaced rear window rubber last week. Sunroof?
I have a 99 C2 with 110,000 miles
Thanks and Happy New Years!

 

Most likely sunroof drains need to be purged. The drains are above driver seat.