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[–] this_beanewusername 0 points 0 points (+0|-0) ago  (edited ago)

Could be the blower motor, especially if it's when the fan is on (and not just the AC). If it's only when the AC is on, I would start checking out the compressor.

The belt runs at a static speed, no matter how fast the engine is going.

When you say "accelerate", do you mean actually "accelerate" (i.e. when vehicle speed is changing)? Say if you're at a steady 60 mph, does it still do this? This would rule out some kind of mechanical issue, like the acceleration of the entire car causing a spinning part to brush up against something (say a radiator fan or blower motor)