its very possible that the cage fans on either side of the blower motor have cracked apart and shattered inside the housing and the blades still attached are whirring against the loose ones, happened to me. the only way to fix it is to replace the whole blower motor, the fans are factory balanced. as for the ac, it has to either just need a recharge as MrM3 pointed out or the compressor has seized, which isn't a hard replacement but even after i replaced mine and had it professionally charged the ac still won't work.
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