I have a 1997 Isuzu Rodeo and the alternator belt broke. Replaced it, but now the fan is rattling like it is loose. Do I need to buy a new fan? I think when the alternator belt broke that it slapped around and dislodged something to do with the fan. But the fan still spins.

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It is likely the fan clutch problem that caused the belt to fail, so in this case yes i would replace the fan clutch. Don't forget to check the water pump, it may also be the source of the noise.
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