Maybe because the vans are getting older or this was a poor design to begin with, but this relay board tends to melt causing your air conditioning to fail. In this kit, you get a new 50amp evaporator fan relay (The picture is old and shows a 40amp relay), relay board, 50amp fuse and fuse screws.
This relay board lives behind the driver's side D-pillar. On passenger vans it's behind the plastic panel and on Westy's it's behind the closet.

Ref ID: KT-9984104