Why is my AC unit making noise?

I have a larger unit that is placed in a hole in the wall leading to outside (not a "central air" unit and not a window unit per se). We have lived here for 2 years and not had any issues. The unit is not making an odd clicking noise, almost like a fan blade hitting something. We've cleaned the filter and also taken off front cover and carefully cleaned the inside with a vacuum. No leaks. And the unit still blows plenty of cold air. The clicking noise follows now set pattern, sometimes every couple of minutes, sometimes not for a couple of hours. I suspect we may need to have a pro look at it, but was crossing my fingers that we MIGHT be able to fix it ourselves. My partner and I are very handy with tools and are confident we could fix it if its simple. Thanks for your help!

Asked By: - 7/27/2009
Best Answer - Chosen by Asker
The type of unit you have is called a PTAC. That stands for packaged terminal air conditioner. They are quite common for use in hotels and such. The unit contains all of the parts in one package. There will be 2 fans for the unit, one for the indoor air and one for the condensor air. I would think that the bearings for... More
Answered By: Chiefmanycrows - 7/27/2009
Additional Answers (3)
the fan is hitting water is the cause of that , the A/C needs cleaning out so it can drain properly,not the filter the whole unit this should be done at the end of the summer so the unit is ready when you need it next year, take it out remove the cover and clean the inside thoroughly and make sure the drain is free of... More
Answered By: Jonathan R - 7/27/2009
It sound like a start of worn bearing for your fan. Try wiggling it a bit and see if it's loose. It might not take much. It will only make noise at a proper resonant frequency until it is total worn then more frequently. Those are the only moving parts in your A/C unit. Good luck
Answered By: Daddy Pou Pou - 7/27/2009
It's actually ice forming and cracking inside your AC, I've had the same problem. If it starts making the sound just turn it off for about 20 minutes to let the ice melt, then turn it back on and you should be good to go
Answered By: Eryc - 7/27/2009
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