V50 WATER comes from the ventilation!!

Hello everyone, have a wet / damp problem with my Volvo V50, model 06. He has now about 148tkm on the clock.To the problem:The right rear footroom is wet whip-patch. When you take out the floor mat, the water runs down like a water tap. The liquid comes from the ventilation, which is under the passenger seat and ensures the ventilation to the rear. When I set the blower on ́feet ventilate ́, the unwanted source bubbles. But also if I do not put on ́ventilation top and center ́ the water flows. Now I need your help! What could this be on? Have until January a car guarantee and the partly damage to the air conditioner: compressor, evaporator and condenser with fan. Hope it is a defective part of these or just a small thing. Thanks for your answers!