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What you describe sounds like a normal compressor to me, so probably nothing to worry about. Easiest way to confirm it's not the blower fan is to vary the fan speed from the climate menu, leaving the temperature and other settings the same. If the sound is the same regardless of fan speed, it's just the compressor running. And sometimes they can get quite loud; the less energy available to transfer from one side to the other, the harder it has to work.
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