Kenmore upright vac model 33922 - good suction but developed loud whining noise after accidentally vacuuming room without bag. Added bag and changed both filters. Still makes noise. How can I stop noise?

There is a blockage somewhere.

Unfortunately you may have to try a vac shop or order online. Parts for these older Eurekas (other than bags and belts) are becoming ahrder to find.

Some units power the brush by vacuum. Check for plugged air way to Vac motor

If you need further help, reach me via phone at https://www.6ya.com/expert/gary_9c859f4aa7e5ab10

Loud whining noise generaly indicates motor issues, which also provide suction to extract water from carpet.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_b96ba3f038cf317c

You have not stated which model vacuum you have. Bipass vacuum have a bipass compartment which is under drive unit. Make sure there are no cracks around housing as this is where you vacuume is created. In order to have vacuum you must have airflow, in assences suction. No air flow, no suction. If the airflow is deverted somehow suction will stop. Your filter, your bag are all sources of air flow. Clog either and you lose suction. Start with loss of air, being cracks in housing,bag or filter

Sounds to me it could be tha fan impellor.
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Theres a little bendable neck that hose with suction plugs into. Thats the one thats clogged. You will have to fish it out by taking off the roller and clearing the clog.

Find a Shop that sells these & get them to show you.how it works.

35922 is not the complete model number, it will be on the back or the bottom of the vacuum. Example: 116.35922****

When the vacuum is in the upright position, it should give you suction thru the hose.