Originally Posted by elsolo
If it does it on all speeds, then it is the fan motor itself.
You may or may not need a new fan motor, without a cabin air filter, debris can get into the fan.
I have (twice) removed leaves that wrapped around the commutator of the motor, and stuck in the squirrel cage, they made all sorts of noise. I since added the cabin air filter to prevent debris from getting into the fan motor assembly.
Thanks. Is it behind the glove box?
It does run ok for a short while, so maybe it is debris.