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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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