No vent in catch can

DrCharles said

As I answered, the simplest solution was to just drill a hole, and keep the drain **** functional.
I don't expect it to keep puking... if the cold coolant level is in the right place, then the full hot level won't overflow. Not running it as a coolant recovery system. Plenty of spare room in the top tank, too.

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Sorry, I disagree. All it has to do is puke ONCE and your headroom is gone. Because next time, it will go out the vent. And since it's not easy to look in there, how do you know if it's full? You'll have to check it every day to find out

"It's so easy" to hook this up as a recovery I don't understand why you wouldn't