I've found over the years that the Ranger radiators are prone to leaking where the ends are crimped on. I've had my radiator on my old 89 to the local radiator shop 3 seperate times for him to recrimp it. It finally sealed up. I did a pressure test on the 89 and it leaked a few pounds off in about 15-30 minutes. We're amatuers though so we weren't sure about the results. Although I did end up having a cracked head in the end.
Wash all of that coolant off and wait a few days and watch for new leakage..
2001 Ranger Edge Reg Cab 4.0 4x4, Factory 8.8 - 4:10LS -1989 Ranger Reg Cab 2.9 4x4
“The automobile changed our dress, manners, social customs, vacation habits, the shape of our cities, consumer purchasing patterns, common tastes and positions in intercourse”