My rear window is not shooting out fluid even though the rear resevoir is full and I can hear the little pump making its noise. Not sure what the issue could be, and if it is the pump, where is it located?

You could have a clogged hose somwhere, or it got jiggled loose in the hatch. Check the hoses first then, when you activate the pump try to locate it and see it it is pumping fluid or just making noise.

There is usually a check valve in the line. If the pump is running, that would be the first thing to check.

hmm...i had the same problem with my wagon so what i did is i took out the jack and pulled out the hose that leads out to the tailgate. there it has a little thing that looks like a small metal ball. check that because it might be stuck. use something thin to move it. if its stuck it should move when you punch it with the pin. my two cemts on the matter. but yeah check that out i'm pretty sure that that's what it is. later!