Dunno but my D16Y4 was slightly different as I couldnt withdraw the unit because of a fuel line and didnt want to tamper with it.
Took it to a Honda delaer who belted it with a hammer and cleaned the hose out all for $40 and it's right as rain.
Said he moved the muck by belting it
If it happens again they want $800 to replace and flush the radiator lol
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