Quote:
Originally Posted by bl52krz
The ‘wush’ You heard was air going in the tank, not coming out. As the water cools, the level drops. When you undo the top, air rushes in to replace the vacuum that has been caused.
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If that's the case then the valve in the expansion tank cap, designed to prevent the creation of a vacuum, isn't working.
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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