The sightglass in an R-134 system typically doesn't clear up 100% (as an R-12 system did) when it's fully charged and (typically) you will overcharge the system if you try to add enough R-134 to clear up the bubbles/foam.
Some new systems or replacement dryers have now eliminated the sightglass altogether.
Without gauges or other exotic tools you are better off to add R-134 sparingly 'til it cools reasonably well and stop there rather than trying to clear up the sightglass.
Of course, if there is a problem other than low refrigerant level making it not cool or cool poorly and you add a can or two of (unneeded) refrigerant pressures are gonna be WAY up.
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