I have a Nissan 350z and have never had any problems with the vent. I've always used a no-spill funnel. My radiator broke and I replaced it and then used a funnel and after so many repeats I couldn't bleed it, it took hours and I still had air in the system. Literally 5 minutes or less with this tool and I removed all of the air and it stopped overheating. The only downsides are the toolbox is huge, other brands cheaper set comes with missing adapters and on mine when you move the adapter also leaks a bit when you push the system in when it pulls to the sides, maybe this is normal?
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