Hi, I'm trying to diagnose an issue with my A/C unit. Unfortunately I just left town for a week when this issue started so I'm trying to get ideas so I can address it when I return. My unit is a Rheem and only a year and a half old. What I'm hearing is a horrible loud noise coming from my outside unit. At this point it also seems to be random. The A/C can be running fine then the noise will start. Normally the noise will start for a while then stop randomly. Last night it sounded like it was repeatedly clicking on and off but the A/C was continually blowing air inside the house and the air was cold.It wasn't like the air stopped and started blowing every time. Eventually when it clicked "On" the loud noise was constant. After about 5 minutes of the terrible noise it went completely quiet and was running normally. When it goes through this clicking on and off phase, every time it comes on I can see the lights in my house dim. If I go to the air handler in my hall closet, I can feel the vibration and some noise within the handler but the source is definitely outside. I took a quick look this morning outside before I left and didn't notice anything externally. The pipes leading to the compressor appeared "wet" but didn't see any ice or frost. Any suggestions or ideas would be greatly appreciated.