Since it's "auto repair season" in my driveway, I was working on my daughter's car (2001 Accent, 1.6 GSi) and noticed that the air conditioning compressor makes a noise (like a cross between a burble and a shriek) when it cuts out after it's normal on/off cycle. I'm assuming it's the head unloader and was wondering if it's supposed to make a noise that's quite that loud or if maybe it's getting low on refrigerant - the compressor runs quietly when it's turning and the clutch doesn't make any strange noises.