Might have to get up on the roof and take a look at the drain pans under the A/C shroud. On my PT, the drain hose from roof to ground is 1/2" ID tubing, pretty large to be clogged up. Your clog may be in the drain pans. Also, my drains work sometimes, and the A/C condensate runs off the roof sometimes. Maybe the rig has to be dead on level.