Hello farmallfarmer. Sounds like you may have an air flow problem. If the ac charge was low it would not get cool as you say it does when it is first strated. Your system probably has 134a as a refrigerant, and compared to the old R12 freon it carries a much higher high side pressure.Having gauge pressures readings would help on the diagnosis, when the unit is first started and when it failes to cool. If it was low on gas it would act the way you discribe,(I don't think so),Here are 2 of my guesses 1: Hot water is getting into the heater core see if you can feel the heater hoses.The old systems did not blend the heat into the evaporator, newer systems do so to controll cooling output. Heating output in BTU'S is about 3 times more than cooling BTU's. If the heater valve/controll is fully on the air conditioner will never catch up but If the system is fully charged it would be dumping water out of the drain like crazy.If you have the old type system the heater hoses should be warm to the touch not hot. I would run the unit until the cooling stoppes, and then blow air with a fan at the condenser and see if it makes a difference.There is many other resons for the unit to stop cooling including some of what the other posts suggested . Just something easy for you to try. Guido.
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