My problem is---I don't have a problem
I will try to explain.
The air con works without fault.
But I do not see- never have seen, any waste water on the road.
The carpet are dry and I am not aware of any window condensation issues.
Under the car I can see no sign of an outlet grommet or whatever.
I can find no reference to an ac drain pipe in Citroen Service box.
Internet searches brings up nothing that look like what I am find behind the lower console panels.
Any ideas Pls.