OK I need some info on the GM washer pump and how to replace it,,, its in an 04 Silverado sounds something is clicking when I push the switch but nada out the line, wipers come on so I have to figure that the fuse is ok so I put a little air back through the system and it bubbles up in the tank so the lines not clogged,,, how in the hell do I get the pump out of the tank with out tearing half the front end out ??