Windshield wiper pump problem

Hello my problem is as follows: I began to fail the pump of the clean and traves of the tuvos put air to pressure, the water comduct of the rear made water well, but the one in front does not make me water, my ask is: how I agree to the pump of the clean see if it is obstructed? My car is a citroen xara xara picaso 2000hdi, a greeting and thanks.

They usually carry two pumps one for the rear circuit and another passes the front suppliers, and are operated independently.
Do not specify through which tubes put air, if it was by the tube or by the water outlet suppliers. Anyway, if you put pressure air, some tube may have been released and the water does not go to the suppliers.
With the standing engine and the contact placed, it acts the water pump control, if you make noise the pump works correctly. Look to see if you have released a tube, or clean the wardrobators with a fine wire in case they are still stuck.
Another way that I use to clean the suppliers is to disconnect the plastic tube that comes from the pump (to prevent it from being released on the pump side) and putting water in reverse direction with a plastic syringe. "Loose the tube, water loads the syringe, you support it on the supplier and squeeze it to inject the water in the opposite direction and drag the shit that is obstructing it." Luck.

By the way, I forgot to tell you that the pump is normally in the water tank or next to it. But as I told you, if it makes noise is not the pump, but it is stuck or has a loose tube. If it does not make noise it can be of the pump or electrical contact failure (of the control, a loose cable ...)

They are mentioned in the same container where the water for the windshield is done, it seems to me that to access in your vehicle you will disassemble the guardfango on the side of the copitloto, nothing of the other world you have to try them with direct correction if when I will send him the cabin does not sound the motor

The first thanks to both of the solutions. Greetings.