Gas and Oil Home Heating Furnaces - condensation line clogged

I have a 3/4" PVC line running from my air handler (which is in a closet in the middle of the house) down through the foundation, takes a 90 degree turn and according to the blueprints, comes out by the outside a/c unit. (although I can't find it) An a/c tech tried to blow it out with air pressure which didn't work. I bought a snake but can't get it past the 90. Any ideas?

Cut the pvc line and install a threaded adapter that will allow you to connect a water hose to the end of the condensate line. Pressurize it and see what happens. If the results are not dramatic, you will see a damp spot forming near the concealed end of the pipe after an hour or two...unless the end is encased in concrete.

We have had the same problem, although we haven't called out an ac/tech. If the condensation pan in your inside unit isn't cleared the debris may drain right back into the line once it is unclogged. Once you make sure this isn't the case get an air compressor and blow the line from the outside in. You can find the line outside by looking for signs of water drainage close to your unit. Should be the only open ended line that is close by. Make sure you have someone hold towels up in front of the unit on the inside so that the debris doesn't get blown all over the place. The compressor should be at least 350psi and needs to be big enough to seal off the outside line....can hold the line tight at the end of the air compressor line.