HELP ! Cooling fan and Drain Plug Mystery for 1993 Voyager

This is my first, so I hope to do this right.
The radiator fan wont turn on so I got a relay switch
in hopes of solving the problem but dont know where it goes? THere are 7 relays under the hood, which is the right one to replace? HELP !

ALSO, coolant is leaking beneath the drain plug. Its not a faulty drain plug, there is a small vertical drain below the plug and there does not appear to be any kind of a hose that clamps on, so how can I plug it
and or what goes there? Nothing has ever leaked there before? HELP !
Our main transportation is down and we need this van to get me to work.

1993 Voyager Van, 3.3 172k

Thanks. And blessings, Mark :shock: