3.7L V-6 / 4.7L V-8
WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The 3.7L V-6 and 4.7L V-8 engines are equipped with a closed crankcase ventilation system. The Positive Crankcase Ventilation (PCV) valve (6) is mounted to the oil filler housing (4).
The PCV valve is sealed to the oil filler housing with an o-ring (1).
Two interconnected breathers (1) threaded into the rear of each cylinder head are used with the system.
The system also includes the air cleaner housing and various tubes and hoses to connect the system components.