Window wiper fluid reservoir leaking

I had refilled my window wiper fluid since winter came around and I sprayed the front it worked great then tried to spray the back and nothing came out. I assumed it was frozen because it was coming out of the front still just not the back. And the reason I thought only the back has froze was because of me having to cut the heat from the back because of the lines leaking. So bad to the back of the trucks heater, that it was not getting any heat. Then I noticed it was not coming back out the front then again. So I checked the reservoir again and it was empty I put the whole bottle in and ran the back and front wipers and it was practically empty again. I am guessing leaks in the back of the truck again only because my boy friend accidentally cut the lines trying to plug the leak from the back of the antifreeze lines (which I do not know if he did or not) but I was wondering if maybe that is the issue? Hope because we do not have the Z30$ pump end motor for the silly thing. We just spent $580.00 on the intake manifold gasket, and then the timing had to be done after or before the the gasket was fixed, which they was a head ache too in itself. Please help me I need to see out of my windows and this truck gets the windows so dirty too quick even when it is raining and only when it is raining after they through salt on the roads or whatever Ohio uses.