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Annoying Sound Effects at idle...

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When idling with the A.C. on, I get a really annoying "kind of pendulum effect with the engine fan noise." It seems like the AC compressor and engine cooling fan are out of phase. Instead of a steady fan noise, I hear a repetative thrummmm thrummmm wummmmmm wummmm wummmm sound at regular intervals. Do you guys know what I'm talking about? Fortunately, the fan is not stuck on. When I turn off the AC, the noise stops. Could this be a sign that the A.C. is going bad? I'm talking about a loud, kind of booming sound from the engine bay that reverberates in the cabin. Ideas?
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