Toyota Repair Problems? Ask a Mechanic for Answers ASAP
Hello and welcome!
Does the noise only occur when the blower fan is on?
When you removed the blower fan was there any kind of debris on the fan blades? This can cause a vibration noise.
Normally they do not need to balanced, they are balanced when new.
I would try lubricating the motor shaft bushings, this this fan motor enclosed in a plastic housing?