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Are you referring to the blower motor inside the car? If so, they get leaves in them which puts them out of balance and makes them noisy. Just take out the blower, 3 screws, and clean it. That's the cheap answer. It can be a bad blower motor.
LOL! I don't want to sound like a wise guy but I have had some noisy Chevys in my life but never like a leaf blower... Does it happen n the mornings? does it go away? does it come from the front by the engine compartment? rear? maybe the heater fan with papers falling from your glove box? Come back with a bit more info and hope to steer you the right way.
It is very possible that the blower motor squirrel cage housing has leaves in it, they get in there from the air intake for the system at the base of the windshield. Remove the blower motor from the housing and clean out the leaves. These leaves also pose a fire hazard and I've seen that a few times, the heat source is the blower motor speed dropping resistor in the air duct near the blower motor squirrel cage housing, it can ignite the leaves, this can cause at the very least smoke coming out the vents, which can be a little exiting on the freeway.
It is possible that a stray leaf or piece of debris is stuck in the blower fan blades. This is more likely if the noise began suddenly. You will have to access the blower and remove it to inspect the blades. If their isn't an obvious debris problem, the blower fan bearing may be wearing out and getting noisy; although this noise would slowly get worse and worse every day.
there should not be no more then three screws and unplug and the blower is out and you say its noisy check for leaves and to make sure the blower is not hitting anything before you go to buy another one.
The fan speed resistor will cause this fault if it has failed. I'd take a guess and say that the water buildup in the heater box may have damaged the resistor, and possibly the fan motor if it's making noise. It could also be a leaf or something stuck in the fan making the noise, thing can get sucked in there when the system is set to recirc. Not sure of location, but if you pop into a mechanic or the Mitsi dealer and ask them to show you the location I'm sure they should give you that info without charging you for it. At least i'd hope that was the case!