where is the wiper motor on a 1992 lumina van located

under the plastic cowling at the bottom of the windshield

I'll confirm what Eric says... my 90 Lumina Euro Coupe has it there as well, behind the firewall closer to the passenger side... has an odd pass thru connector with a bunch of wires going thru it... lot of wires go to that thing... plastic cowl came off of my car relatively easy...