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Coolant hydrometer



WRT the "radiator coolant testers" (aka floating balls hydrometers)
available, at what coolant temperature should one measure the "goodness"
of the coolant? (at 20F, I have 4.5 balls floating [and yes, I mean
four and a half -- that fifth ball floats about 1/8th inch below the
other four, won't rise, won't sink...], at 200F I have two balls
floating, so which do I "trust"?) The packaging literature was sparse
at best.

					-RDH