Didn't even know my blazer had this thing until today when a friend showed me the button on the switch. Tried to use it and I hear a very loud sound from the engine area on the driver's side, but nothing sprayed out of the wiper. I tried the front sprayer and it sprayed so unless they are separate reservoirs I have no idea where to look.

 

One Resivior with two pumps. The upper is for the rear. Mine was clogged at the little hose coming out of the tailgate.

 

Yeah..also if the reservior is low, the rear sprayer will stop before the front.

 

The fluid level was pretty much gone, which would explain why nothing came out at all. Sadly after refilling it I can see washer fluid dripping out of the tail gate. Looks like this may be too much work for what it is worth.

 

Not that hard to do...same thing happened to me..

 

Its the upper upper pump on the tank. there`s a one way valve in it, 5 minutes. How can that be to hard? Who pumps gas for you?

 

It's leaking out of the tailgate, doesn't that mean I need to rip off the plastic panel? I took the door panel off last summer to replace the mirror and ended up breaking the push pins, now the panel rattles on rough roads. One panel doing this is annoying enough. Not to mention if it is the line that is leaking somewhere replace it, the line that runs the entire length of the car?

 

One way valve is in the pump in the tank in front. Thats all. If the valve is bad, it will leak in the rear,but if its leaking out the gate, thats up to you

 

When I tried to use the sprayer there was a nice blue stream that came from the bottom of the lift gate, so it could be the valve instead of a leak? How does the valve in the engine compartment cause a leak all the way in the lift gate? Do you by chance have a part number for the valve?

 

Sorry I misread the post, it does sound like rear panel removal is needed