Just a point of information about the sight glass. When R134a was introduced, I went to a class about the differences between the two refrigerants, working with the 134, and a host of other things including a bunch of lies about how R-12 systems would not work with the new 134a.
In that class, we were told that the 134 would not give a clear liquid line that you could see in a sight glass. They told us that it would always be cloudy - even if the system was fully charged. You can easily overcharge a system by looking at a sight glass and trying to get a clear stream of liquid in it.
Gauges and a charging chart are your best guide to getting a full and proper charge in the system.
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Today's Featured Article - Tractor Operator Safety - Loader & Backhoe Operation - by Staff. Loader Operation Do not transport anyone in the loader bucket. Always carry the loader bucket low for maximum stability and visibility, whether the bucket is loaded or empty. Always use the recommended amount of counterweihting to ensure good stability. Be careful when handling large objects such as round bales, logs,
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