AC Compressor Humming / Whining at Low RPMs
So I had my AC compressor replaced at the dealer 2 months ago, and recently I have noticed a semi-loud humming / whining noise coming from what I am pretty sure is the compressor. This noise only happens around 1300-1500 RPMs, and only happens with the AC engaged. If I turn off the AC, or if I bring the RPMs back up above 1500, it goes away entirely.
Any ideas what this could be? I also just replaced my IAC valve so that should not be it.