OK, here it is from an expert. EPA certified, been doing it for about 40 years, worked in dealerships for about 25 years, much experience. First, the sight glass is NOT a level indicator. For that reason, it has been eliminated on most R-134a systems. It is ONLY relevant while the system is running with the compressor operating. Bubbles in the sight glass are normal with R-134a systems. You will not get a solid liquid line as you would have on an older R-12 system. The real measure of your system's efficiency is the cooling and the pressures. You need to put a set of gauges on it. On an average 75 to 80 degree day, the low side should read in the 25 to 45 psi range. The high side should read from about 200 to 250 psi. If it is overcharged, the high side pressure will skyrocket to over 400 psi while the low side will read marginally higher. The temperature differential should be around 40 degrees. At an ambient temperature of 80 degrees outside, the A/C should be able to get down to about 40 degrees. In a recirculating system (no outside air coming in) it will go even lower. If your compressor is slowly cycling and the A/C temp in the cab is good, you do not have a low charge condition. Compressor "on" cycle will get longer as outside temperature increases. It should not "short cycle." The "on" cycle should last long enough for pressures to stabilize.
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