Where is the blower motor on a 2000 peterbilt 379?

The blower motor on a 2000 Peterbilt 379 is housed under the dash, accessible from the inside of the cab. It is typically located on the passenger's side, underneath the glove box. To access it, you may need to remove the glove box or its liner, depending on the specific model of your truck. Look for a small electric motor with a fan attached to its shaft, mounted to a bracket. This is the blower motor.