I think leaving the PCV valve on the valve cover open, might disable the Air Door and/or Heat Door of the snorkel on the air cleaner. Though I am not certain ... mine are not working properly, but I actually have not connected the PCV line on my rig as I don't have the filter or that fitting. I'm not sure if mine not working was the cause or ... if they just are just broke; need to do some more troubleshooting myself.
Sorry for the late reply ...
You know, I think this is wrong. Thinking about it some more, having an open PCV line in the air-cleaner should not be related to Air Door and/or Heat Door not working properly. Looking at the schematics, separate vacuum lines control those doors ... I think I have problems with my air clearner.
Again going be to schematics, it looks like I may need to replace one or 2 of the following TAC vacuum motor, TAC temperature sensor, or evaporative system vacuum motor. Has anybody else had similar problems who can maybe point me in a direction for how to deal with that one? Can you even replace the TAC temperature sensor? Where to find one?
Thank you as always -
... can't take credit for the graphic ... but it's cool, ain't it?