Check the elevation of your a/c unit. The elevation at the back should be lower than the front. Test by pouring water from the cooling coil and check if the water you pour goes to the condensate drain line. If water does not comes out, check if it has a small drain pump and a float switch to activate the drain pump. The float switch that does not actuate if water level rises may be the reason why water does not comes out of the drain line.
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