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I also had a bleeder valve go bad. It took a while for it to get bad enough to where I could actually see the leakage around the valve. Until that happened, it would spray out a fine mist of coolant under a certain pressure and then stop when the engine was shut off and the pressure dropped. The crack had to get wide enough to be seen in action to find it. Try a pressure test. Auto Zone will loan you a tester if you don't have one.
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