93 altima - air on loud noise need help?

[MastaFlex 10+ year member]

I have a 93 altima and everytime u turn the air or heat on it makes a really loud noise, like it blowing extra hard under the engine. Its a weird noise i dont know if there is some way to fix it myself, or what to even do.

I was just throwing this up here so i could see if anyone knows anything about this. Its been making this noise for a good month, but i just decided to do something about it

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