Probably just need to go inside, remove the AC ceiling cover, look up into the AC and find the 4 long bolts in the corners, and tighten them up a bit. It is quite common for the gasket that seals the AC opening to compress over time and start to leak. The cure, other than replacing the gasket which means removing the AC from the roof opening, is to tighten the bolts a bit.
Barney
2004 Sunnybrook Titan 30FKS TT
Hensley "Arrow" 1400# hitch (Sold)
Not towing now.
Former tow vehicles were 2016 Ram 2500 CTD, 2002 Ford F250, 7.3 PSD, 1997 Ram 2500 5.9 gas engine