remove front cowling remove plug to motor. remove rod arm from motor. remove two bolts holding in on. while it is apart changing the wiper bushing may be a good idea. install in reverse.
Should be on the firewall.
Underneath the wiper motor assy.
If you need a wiper motor auto zone or advance auto parts should carry this.
If the windshield wipers are not working on a 1990 Chevy Lumina, the problem could be with the wiper motor, the wiper motor relay, or a fuse. The least expensive fix to this problem will be replacing the fuse if it is blown.
Check fuse then check wiper motor
Auto Zone has instructions here: http://www.autozone.com/az/cds/en_us/0900823d/80/16/ac/31/0900823d8016ac31/repairInfoPages.htm
the best way is to unbolt the windshield and fold it down on to the hood. under where the windshield meets the body is where all the wires and stuff is at. its about a 30 min job.
Rockauto.com has them and so does O'Reilly's auto parts A Chrysler dealer should be able to get them.
It is inside of the wiper motor. Remove the 2 or 3 screews that's on the black cover that's on the front of the wiper motor and unplug the electrical connector. Remove the cover and then pull the module board out. Real easy no problem.
The governor for the wipers is located near the fuse box. It is wired to the harness going to the wiper switch.
wiper motor could be going bad
The 1987-1993 Dodge Caravan/Grand Caravan takes 18" replacement windshield wiper blades on both sides front. 1987-1990 takes a 16" rear wiper and 1991-1993 takes an 18" rear wiper.