THE BEARING IS GOING OUT OF THE BLOWER MOTOR YOU WILL NEED TO REPLACE THE MOTOR
SOURCE: The heater / ac blower
It is the blower resister. I purchasted one at auto zone for $18.00. It is located under the passenger side dash. You need to remove the glove box and the plastic cover under the dash to expose the blower motor. the blower motor resister is right next to the motor. Simply unplug the resister remove the two screws and replace. I did this and now my fan works on all speeds.
SOURCE: my blower motor makes loud noise on top settings
new motor by the sound of it ,but never worked on one so i couldnt tell you where it is,other than its no doubt a complete unit with the resistance so it will not be cheap
SOURCE: 2001 nissan sentra "squeaking sound esp when the air blower is on
Have your belt checked for wear, if it is ok- just tighten it. Should take only a few minutes but if you over tighten it this could put a strain on the generator and water pump causing the bearings in one or the other to fail.
SOURCE: 2003 Nissan Sentra Problem overheating and heater doesn't work.
I had this exact problem a few weeks ago. The repair shop first changed the thermostat. Didn't fix the problem. Next step, they found the radiator was clogged. They replaced the radiator and now everything works fine.
SOURCE: 1996 nissan sentra ac/heater switch works only on high. need help
I had the same prblem. There is a relay next to the heater blower that needs to be replaced.
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