2002 Nissan Maxima Heat/ AC Blower Noise

Maxima.org will have it.

Unplug your hose that goes to heater that sends coolant into blower. Take a hose and seal it not the tube. Circulate the coolant out it could just be dirty or clogged up from bad coolant. That's free and 99.999% of th time this works.

Bearings in the blower motor are shot. Only fix is a new blower motor. If you have no experience in auto repair, I would take this to a qualified shop, as most of the time you will need to disassemble the dash to get to it.

It's time to replace the blower motor, bearing in blower motor have gone bad.

you may have leaves or trash in the blower motor cage
the blower itself may be bad.
it's fairly easy to remove it
loose all the screws and the electrical connector then remove the blower motor

Had same problem. Replace Blower Motor. Over a 100 dollars at local parts store, but found online for half price. About 30 minutes to replace. http://www.rockauto.com/catalog/raframecatalog.php?carcode=1431961&parttype=6916
6 screws to remove glove box, One plastic nut on kick panel and 3 screws hold the blower to the air box.

You can Check those with a Voltometer But, Ultimately you will have to Change the Blower Motor.

I have a 2002 nissan Maxima. The AC controls only blow on level 4. No air or heat blows from level 1-3. What do I need to do to repair this problem?

almost sounds like something is in it and it is located on passenger side under dash.