its your squirl cage inside of your blower motor. guaranteed. happened to me twice
Could be bad ball joints.
When there are loose parts in the fan that runs the heater system, there will be many instances of noise and vibration. A technician should dismantle the system and fix it.
there is a whole in the heater core
you may have leaves in the fan
check a/c compressor and belt.
If it's a grinding or howling sound, the heater blower motor bearing has probably dried up and ready to fail.
A bad compressor belt can cause a whistling noise while running the air conditioner. A bad engine can also cause this noise.
A bad starter might make a noise. The starter could also go bad with no noise or warning. However if the starter is making noise then there is a problem that could cause failure at any time
Your CV joints could be going bad. Check to see if your CV boots are cut or opened to the elements. If so, your joints may need to be replaced. Before your spend money have a mechanic verify your complaint.
was there something on your dash that fell in the vent, a bad fan will make noise all the time.
You could have blown your tire or it could have gone flat.