So the sight glass is not part of the new dryer? Is it hard to replace the sight glass? You really need to be able to see what is going on with the refrigerant flow.Low is 28, high is 215. Sight glass in the dryer is milky white. Blows ambient temp from blowers.
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What was your ambient temp when you checked the pressures? I do not know your tractor as well as others here do but they seem just a little low to me, especially if you are at the correct Freon weight.
Check the heater hoses. Something is not adding up here.