Hi my system is the same, Does your system clang n bang more when its been running at high temp then when switched off?
I have looked up this problem before for myself and was led to believe it was gunk and rubbish floating about in the system and to flush the system out.
I have not done it yet myself so i cant tell you if its the remedy.. Sorry!
But its a start for you to look at... Good Luck! :wink:
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