No just had to drain it to replace tensioner and decided to replace all coolant and t/stat. I never moved to valve since new it's always been on. I haven't driven it yet since work performed. I read somewhere that you wont get anything out of that bleeder which didn't make sense to me but I don't remember where I read it for further reference.
Thought I would continue this post rather than start a new one.
Unless I'm not understanding you, that valve is not a bleeder, but rather when opened allows coolant to flow through the carbs. Have a pic to post?