Richard
My initial thougts were to put it in the top return pipe, my idea would be, if the water cant flow back via the small pipe, then nor can the air. This maynot be the best conclusion, but for me it would be my stater for 10. The other thing is, is the seal on the expansion tank cap good, on the rover they reccomend it to be changed every couple of years, it maybe alowing air though under pressure. Beyond that, I am at a loss.
Steve
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