Another AC drain question

Well still could still be a partially clogged/slow draining condensate drain. How well is that bathroom sink draining -OK, slow, backing up?

How old is the air handler? If fairly old, possibly a cracked or rusted primary drain pan whereat least some of the evaporator coil condensate is dripping down into the secondary drain pain?

The other hole is just another drain from the primary pan, if water is coming from it , then either it always has and you just did not know as most are plugged, or condensate is not draining freely from the primary pan into the existing pvc

I am betting the pipe that comes out of unit is clogged before it gets to pea trap, , looks as the pvc joints are glued so I would cut pipe in middle and clean it out and repair with a coupling

I suggest using a rubber tapered stopper to plug the hole. A hardware store or Lowe's should have them.

If cold air is coming out.... your are loosing a lot of cold air and $$$.

As posted.... there could be a little trash inside the A/C particularly blocking opening to this drain line. This should be checked to prevent future water drainage problems.

When I check my drain line, I have a coupling that I can take apart. I put a "catch" pan under the pipe to catch any water that might come out. I then take a deep breath and blow into the pipe until I blow out any water that is in the line. I then add about 1/2 cup of bleach and put the pipe back together.

Another thing to check is the slope of the drain line. It should gradually slope downward to where it connects to the sewer vent pipe. It the pipe sags and has a "low point" this area need to be raised a little.

There is an internal drain tray that water flows off coils too, unit needs to be opened and cleaned