1999 Volvo S80 P.C.V. Oiltrap

My car is a turbo I am trying to locate the pcv oiltrap so I can clear the hoses going to it and clean the trap itself. My emmision lwarning code stays on and I'm pretty sure the crankcase needs to be ventilated. Can you give me a picture or description of where it is located in relation to the front of the car and what hoses go to it. Second question is what function does the Evap Cannister purge valve have. Can it be cleaned? Thanks Guys! Pat