The screenwash on my 2012 Citroen C4 works on the rear screen but not on the front windscreen. This fault has just appeared. But what is mystifying me is that I can hear the pump working when selecting wash for rear screen only, but no sound from the pump when front screen wash required. Can there be two separate pumps in the bottle (which is full)? I have of course checked the pipe work to the jet nozzles and all seems right there. It's the fact that the pump works for one screen and not the other that's baffling me.