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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Today's Featured Article - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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