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, www.barsleaks.net/faq.html
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. http://msnbc.msn.com/id/8641667/ 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 ) ?