Thanks htg. Am hoping it is air. The system seldom looses pressure & maybe once a year i have to top it up to the 1 bar mark, but tell you what, it can be a bugger to get the air out.... & of course the more you bleed the system the more go have to keep topping it up.
Will leave the flush in for the specified time then will drain\flush it a couple of times before putting the inhibitor in. Then see what happens.
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