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Hello, my name is ***** ***** I will try to help you. Please remember I just report or interpret the law, so the outcome may not be what you hoped for.
I suggest you send your neighbor a formal letter of complaint about his air conditioner and demanding that it repaired otherwise you will be forced to take legal action to resolve the situation. I would remind him that the prior damage from flooding from his unit you had to absorb your own repair costs and you will not continue to do that. If you do not get a result you can file what is called a nuisance action in small claims court. This is an action that says someone on an adjoining property is taking or failing to take actions which impairs your use and enjoyment of your own property.
You should also review your condo association rules and bylaws to see what responsibility the association has for this type of problem. No matter what I would also make a complaint in writing to the Association and in that letter recite the verbal complaints you made previously to which the association has not responded.
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The cost would be $60. It would have to be done as a premium offer. We would communicate by private email that is not visible to the public. If that is acceptable to you, let me know and I will send the offer with a private email address to send your letter to.