I'm asking because the AC in my '98 CRV doesn't perform like it used to so I
bought one of those products last Saturday(with a gauge built into the unit)
only to find the refrigerant level to be well within the specs of being fully
charged. Aren't there compromises when you're only adding refrigerant to the
low side? I remember my Dad telling that the correct way is to let a
qualified shop do the work since their equipment is able to deal with the
high side as well.

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