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Have you use a cleaner that reaches to the other end of the pipe?
Out side of your house you will find this end of the pipe. Many times I have found them covered with grass and dirt. I have also seen ant's make there home in them to keep warm over the winter time. So check for this end of the piping.
Best to you, keep it cool! JL
Good inputs from the other contributers. I want to add that the drain line may not be blocked at all. Where is the AC unit located? Attic? Garage? Inside closet? How long has this been an issue..? Every year? What has been done prior to it happening that could have caused it? Could be the drain line is not sloped properly to drain the water out of the shallow sided drain pan before the pan
Do you have an annual maintenance contract on your HVAC system? If so, call that company and have them take a look. Tim
Keepin' it real! JL
How long has it been leaking? Chances are, if it worked fine in the past and it just started overflowing then you may be lucky and just have your drain clogged with slime. I have blown them by my mouth and by compressor in the past. I must say that I have never used compressed air in a can, but that is also a good idea. If you use something other than your mouth, you will have to wrap a rag