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The nozzle should be visible and it should spray onto the glass in a jet, normally straight down. Find the hole, they are stainless steel or brass and clean it with a pin. The pump is part of the reservoir.
If it is not touching the glass the arm is bent. Raise the arm away from the glass. Grasp the arm near where it is mounted to the body and near the wiper blade with the other hand. Slightly bend the arm toward the glass. Only bend the arm a very slight amount and check to see if there is enough pressure for the wiper blade to work correctly. Repeat this until the wiper blade cleans the glass properly. DO NOT over bend the wiper arm as too much pressure will cause the blade to wear out very quickly.
If the spring is good then the "hinge" needs to be oiled.
Just use some WD40 or other break free oil and lube and loosen up the hinge by squirting the hinge and pulling the wiper away from the rear window and pushing it back.
Keep this up until it is loose again and springs back against the glass.
If the spring is bad then you need to get a new spring or wiper arm from a junkyard.
I hope this helps.
I had to do it to my 98 Grand Limited too.
I have this same problem and I was told once it is above freezing here to wash it and lubricate the hinge and spring. They said those get gunked up and won't move with the window correctly which causes this problem. This week I hope to try it since it will finally be warm enough!
The arm on the rear wiper is common to seize up where it pivots on the rivet. spray some penetrating lube like Liquid Wrench on it and work it free by pulling it toward you and pushing it toward the glass/window. you may have to bend the arm a little so it has more pressure on the blade against the window. Replacing the arm is always an option if it wont free up enough.