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sounds like blower motor fan for heat, the motor itself can be going bad or something is hitting fan blade inside heater box, I have seen all different things in heater boxes including acorns , leaves and general debris causing noises when fan for heater runs, you need to take it apart and check for anything that might be hitting fan if not motor is going bad and needs replacement, good luck.
It is not probably the resistor pack, because that only is in circuit at lower speeds, and would not cause noise. If there is not something in the fan, like leaves, then it is probably the fan motor bearing. If you can get at it, you could try lubricating it. Thin sprays get in better, but don't last as long. Heavy grease is best.
open it up and you'll see it while its running sounds like fan bearings or fan misalignment may need a new fan motor. if you replace the fan though make sure all power is off before disconnecting
seems to me you have a bad bearing in the fan. if you can access the fan, have a few drops of oil poured on the shaft of the fan and see if it solves your prob.
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