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(formerly) 03 H6 OBW , (presently) 06 WRX Sportwagon & 2021 Honda CR-V
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HGs sound bad and are leaking CC gasses internally into the coolant and the conditioner only helps with external leaks.

You could try the chemical HG test from the auto parts store - but some folks say it is indeterminate. There are youtube videos showing it's use. the bubbles in the coolant will turn the liquid yellow - but really now, where would bubbles in the coolant be coming from?
 
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