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Most likely the variable speed motor, What is model on furnace .I will verify if you have an ECM motor.IF so, this is often normal. Did it just start or is it a new furnace?
If gas furnace, model will be on a label in burner compartment
That is the coil.You will need to remove top panel on furnace and look on inside panel for furnace model.Thanks
Do you see perhaps GMH95 on the label?
Label should be about 5" x 7 " on either right or left inside panel in burner compartment
Let me grab a manual
Ok got the manual. Your furnace does NOT have the ECM motor, so this is going to be a different issue. Could be a loose or broken fan bracket or something
If you can remove he bottom door we will take a look .