Hey Guest!
Airing out won't re-activate the charcoal; but that should not be the issue with the crankcase vent. The canister just has to allow air through, which you should be able to achieve by cleaning out any fine dirt and carbon particles, plus cleaning the screen in the bottom and replacing the cotton filter. (Worth noting perhaps, that aquarium charcoal won't actually work either.) Also double-check that the anti-runon valve on the bottom (if you have one) is staying open and flows freely.Airing out wont' work.