i have a 1997 blazer thaT THE REAR WASHER IS NOT WORKING, I REPLACED THE WIPER MOTOR BUT THE WASHER DOES NOT SPRAY WHAT CAN I DO TO FIX THE PROBLEM

I think there is only one pump, if your front is working then you likely have a plumbing problem, cracked , plugged or frozen hose. and yes, the cheap washer fluid can freeze if it gets cold enough.

There is a separate washer pump in the rear fluid reservoir for the washers that would need to be replaced, as long as there is not an electrical problem.

ok, thanks Rowe, thought there was only one pump!

take a sewing needle and insert into firring where washer fluid comes out. if mpump runs then end is just plugged