BMW Questions? Ask a BMW Repair Expert for Answers.
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If this is the interior fan that blows the air through the vents the loud noise usually comes from either worn bearings with the heater/ac fan blower motor itself with the heater/ac fan blower motor needing replaced or in some cases debris makes its way into the fan motor cage and causes an imbalance which causes this noise here.
The fan motor assembly would need removed to inspect it internally to see if there is any debris in it.If there is no debris in it then it needs replaced.If there is debris in it then it needs cleaned out and then reinstalled to correct this here.
If this is the engine fan motor that is loud and wasnt an issue before let me know so we can continue.
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O.k.,when the compressor was replaced was the correct amount of freon installed in the ac system?
Is the engine temp gauge reading properly on the dash (if equipped)?