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Ian, thank you for your shot of optimism here. As you can see we are going to more and more Desperate Measures to solve this temperature problem. Paulbf150 and myself seem to have the same problem and others may have it too. I don't expect this is the first time it's ever been encountered so maybe somewhere in your past you encountered this set of symptoms. Can you think of any other temperature problem Solutions that you found have not been mentioned here yet?I have yet to come across any honda with unsolvable overheat issues. May I ask what version of DrH you are using? Your post on temp monitoring indicates block temp is not shown, the factory version which I have definitely monotors block temp. You are missing something somewhere in that cooling system or and this is very possible, you may have a faulty ecm triggering an overheat prematurely. Your block temp can go as hogh as 110deg before triggering an overheat.