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This sounds like your condensate drain is clogged. If you have a wet vac and can cut the condensate drain line I can give you instructions on how to clear it. Let me know
You can cut it with a hack saw or any wood cutting hand saw.
I can point it out to you if you can post a picture of your AC coil box here. It's usually 3/4" PVC pipe. You can post a pic here by clicking on ADD FILES next to the SEND button. Get back to me when you're on site. I'm online more or less until 7 pm Eastern. I do take breaks so I'll get back to you as soon as I can
You need a saw and a wet vac. PVC cuts like wood so any saw that will cut wood will cut PVC. You also need a coupling to put it back together. If your drain is like almost every drain it's 3/4" PVC so you'd need a 3/4" PVC coupling.
I'm sorry there is no other effective method. But you might be able to get the drain flowing without a wet vac it's just likely to clog again sooner rather than later. I see several wet vacs on the HD site for under $50 which is a lot less than a service call to an HVAC company. However while there is a very good chance this method will solve your problem I can't guarantee it will. If I was in your position I'd risk the $50 rather than pay the $100+ sure thing cost of a pro to come out.