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I had a similar problem recently after changing the coolant tank. Turns out, the Bleed valve was defective.
Do a pressure test. If it doesn't hold pressure, clamp off the overflow tube and fill the black top of the coolant tank with soapy water. Mine bubbled around the bleedvalve and when I took the valve out, was cracked inside. Replaced and held pressure. AIrlift vacuum held at 15 mm Hg.
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