I have 1995 F-150. Under the jump seat behind the passenger's seat in the corner I noticed a fair amount of water. Is a drain hose plugged? Where is it located? Any ideas?

 

Had a similar issue with my '97. Water was leaking from the top part of the rear slider frame. It was either OEM or dealer-installed, but it was leaking. Truck had well over 200,000 miles on it. Have a new STX now.