The two most likely things that come to mind for me are evaporator icing and expansion valve. If the evaporator is icing up, there are a couple of things that can cause it. Undercharged system, cycling switch, and restriction in the air flow are most common ones. Expansion valve could be a problem if it has one. Some systems use an expansion valve, some use a fixed orifice tube. Your symptoms do mimic a bad expansion valve. Expansion valves are hard to diagnose. They show good readings on the gauges, but the system will not reliably work efficiently. Orifice tubes, on the other hand, tend not to give problems like you describe. They either work or not. Nothing in between.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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