Outside A/C condenser loud?
Answers: the condenser fan motor bearing could be going bad or the hub on the disciple blade is coming loose from the fan itself...or the worst senerio is that the compressor could be going doomed to failure...if the compressor is noisier at times than at others could mean that the compressor is going bleak or the capacitor could be going bad cause it to work harder at times...this is something you need an hvac tech to come and check and do a nouns test on your compressor and check your adherent balde and fan motor
Your adherent could have be damaged or it is loose. Also the bearing in your motor may be going out. This is what I suspect as you haven't maintain it for the last three years. You may know how to save it if you go and get some oil into it, but be prepared to replace.
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