Climate Control Fan - buzzing - what's this part used for?

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Hi~

I have a 98 328is with 175k miles on it. The climate control auxillary fan makes an annoying constant buzz while i'm driving. I took the climate control unit out unscrewed the fan and cleaned out all the dust and sprayed a bit of silicone grease behind the fan to see if that would stop the buzzing and it did not stop buzzing. I was trying to lift the fan up a bit with a screwdriver and I think I broke it because now it doesn't spin at all. What is this fan for exactly, and now that it doesn't spin will it affect my a/c or heat?

Thanks in advance for any replies.
 

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