A couple posts asked where the condensate port was.
This is picture of the port to pour warm water into your A/C condensate drain - I do it the first day of each month during the cooling season. There is a twist off cap in the white pvc line which has already been removed in this picture. In a gallon of warm water, I put a cup or two of white vinegar to help cut the "goo" in the lines. Get yourself a cheap plastic funnel to pour the water into the port - pouring from the "milk jug" is a real pain.
