Furnace blower motor makes buzzing noise and won't start

I can only add that the high current is normal for a motor that is starting. It's called locked rotor current. But if left in that condition the motor will indeed overheat. I would have suspected the cap but you eliminated that...

There are 2 main or common things that can cause buzzing and not starting. The first is a starting capacitor that has gone bad. Starting caps provide a phase shift to help the motor start. The capacitor(s) are usually close to the motor in a electrical box on the unit (some motors have the caps mounted on the motor but more often in a HVAC system they are behind a panel). The second is the contactor (motor relay) that connects the high amperage to the motor using low amperage / voltage to energise the motor.

To check a cap. It needs to be removed from the circuit power off for a few minutes before removal and if it has a bleed resistor this disconnected after removal the easiest way is to use a meter with a capacitor function and see if the value in uf (microfarids ) is within 10% of the value stamped on the cap. A more complex way and less accurate is to use a ohm meter put the leads on the cap and watch for the value to start increasing, switch leads and the value should start high and drop ( the meter is charging the cap in 1 direction and discharging in the other) if there is no change or the cap dosent charge and discharge it is bad.

If the cap appears bulged or leaking it should be replaced.

With the contactor sometimes they just get weak and can not pull in from rust or the coil is swolen because of overheating. The electrical contacts can be pitted and not making a good contact it will need to be replaced. For any of these issues.

I find the starting cap to be the problem more often than the contactor but have had both fail.

1 additional note there may be a second capacitor or 2 capacitors in 1 can the second if it has it is usually the run cap. Make sure to label the wires when you take them off I even do this especially with dual caps.

Sorry this got long but was trying to give enough info for you to troubleshoot and repair without waiting for multiple steps as you check things out.

For my unit (similar issue) I think the issue is the blower relay, which should be an easy swap when the part comes in tomorrow. I'm just a novice that is very safe, does a lot of research, and follows directions well. I have read on other forums that a failing relay can cause the buzzing sound - lets hope that's the case because the next step is blower motor for me!