I just bought a used S40 and there are two holes in the wipers water deposit and i dont know what is missing there, any one can help me, one hole is in the bottom and the other is about 4 inches above.
My guess is that the lower hole is put there for the V40 version, they have a rear viper... The hole further up.... Do you have vipers for the front lights??? If not, that hole is for them! Most cars in Europe are delivered with vipers for the front lights, I dont know how it´s over there..!