new bleeder valve leaking

[crankor]

Originally on this car there was just a straight plastic tube where there was always shown to be a blender valve... so I swapped it out for one of those aluminum ones and well, I've known there was a tiny coolant leak since I could faintly smell it in the engine bay. Today I got around to doing my old wrap the suspected spots with a paper towel and tape then go for a drive and ofcourse the new bleeder valve leaks. Im going to try and just replace the o ring seal but I was wondering id this is a common issue with that one? It didn't occur to me that it could potentially get too hot and ruin the seal vs being plastic thoughts?

[AZhitman]

Hope I'm understanding this one right...

If it originally had no bleeder screw (in the T-fitting), then it was done that way on purpose.

The threads may not have been 100% compatible (even if the valve threaded in nicely). I'd remove it, and replace with the correct T-fitting. A quick Google search shows they're not expensive.