2002 chevy trailblazer blower motor vibrates very noisy - have had mice nest in past. How do I access and clean it out?

pull down the blower motor that is where most of the mice end up

The usual place they nest is in the blower motor cage area because it is the largest part of the air ducting. I suggest you pull the blower motor out and you should be able to clean it out there.

Things can get stuck in the hamster wheel assembly. Many times you'll find a mouse nest in there, see it many times. I would suggest you clean this out and you should be good to go. If the blower motor is indeed bad after cleaning, think about getting one from a junk yard and installing it, much cheaper. These don't go bad all that often, so try cleaning it.

Not sure if you know how to drop the glove box door to aid in this procedure....So, empty the glove box, and open it. To the left, you'll see an access hole, stick your finger in there and you'll feel a spring loaded metal piece that you can press back, this will drop the door all the way down, for easier access to not only the motor, but that pesky resistor also.

This is a common problem. It is much more common in vehicles that do not move for several days at a time. It is usually caused by rodents getting into the blower housing and building nests.

The blower motor assembly must be removed to clean out the debris. Here are the instructions for your vehicle:

BLOWER MOTOR

Removal and Installation

Disconnect the negative battery cable. Remove right front door scuff plate. Remove kick panel. Remove lower dash trim panel. Unplug blower motor connector. Remove blower motor. To install, reverse removal procedure.

Big job...you have to open the dash to get at the housing. If you don't have the tools,bring it to a trusted garage.

Just go on the passengers side under the dash and remove the insulator panel to see the blower motor.What usually happens is when it gets cold out critters from outside will work their way into your car and make a nest in the blower motor fan.This throws the fan out of balance and hence the vibration.Once you can see the blower motor then remove it.There are 3 or 4 screws.Hope this helps.Good luck.

under the glove box,pull out plastic push pin holding plastic duct work and remove duct piece,three screws holding blower motor cover,remove them,then disconnect blower motor wires at connector,remove three screws holding motor up in place.
watch the mice don't fall on you!

could be trash leaves acorns ect in housing that the blower is picking up then dropping when the unit is off. try cleaning the housing the motor fits into

There is no such diagram. If you wish to do it yourself, snap with your camera phone before you dismantule.

I'd recommend you buy a Haynes or Chilton aftermarket service manual, they are <$20 US and will be available at nearly any chain auto parts store.
Either will give you enough information to find and possibly remove the blower assembly.