Okay have l got this right? The equinox has two pcv systems? One that functioning when the manifold vacuum is high and the other when you have very little or no vacuum like wot? The reason I'm curious is that wouldn't the PVC system that uses the fresh air intake only works when you have very little vacuum like wot? I want to install a oil catch can but some guys say no use putting it on the fresh air intake system but that would be when the engine is producing the most blow by and likelyhood of pulling oil vapors into the intake because that's when the rpms are high like wot?