Does anyone know where the pcv valve is located? I cannot see it.

4.0 or v-8 cause i'm pretty sure the 40 doesn't have one.

2004 V-8 Laredo 4x4

It's located on the oil filler tube on a 4.7 V8.
The 4 liter six has a Crankcase Ventilation (CCV) system.
It's PCV valve equivalent is a fixed orifice fitting of a calibrated size.
It also should be checked for proper operation.