When hot, coolant's air bubbles appear / expand, so coolant always got pushed out of cap & into overflow-bottle. I put a o-ring onto cap's bottom seat for cap's gasket to press onto, to increase cap's spring's pressure on coolant,
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then engine( F20A )'s maximum
*temperature is lower, I think because air bubbles are now smaller so heat can be transferred out fstr : now * does not ( used to ) reach the top left corner of my '90 accord ( tmprtre gauge lacks calibration ) 's gear position indicator's D3 box, in 29°C ambient air . Users in hot weather e.g.
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beware. Does any1 here put distilled water in radiator ? Can distilled water ( w-o air dissolved therein ) transfer heat fstr than tap water ( has air dissolved therein ) ?