High pitch whistling noise - KitchenAid Refrigerators

The high pitched whistle that you are hearing from your Rigid shop vac with a long hose may be due to several reasons. Here are some possible causes:

1. Airflow restriction: When you use a longer hose with your shop vac, it increases the airflow resistance, which can cause a whistling noise. This is because the motor has to work harder to maintain suction, and the increased resistance can cause turbulence in the airflow, creating the whistling sound.
2. Hose size: The size of the hose can also affect the whistling noise. A smaller diameter hose can increase airflow resistance, which can cause the same issue as a longer hose.
3. Clogs or blockages: If there are clogs or blockages in the hose, this can also cause the whistling noise. Check the hose and attachments for any obstructions, and remove them if necessary.
4. Vacuum motor issue: In some cases, the whistling noise may be due to a problem with the vacuum motor itself. This could be caused by a damaged impeller, a loose fan blade, or other issues with the motor.

To fix the issue, you can try the following:

1. Shorten the hose: If possible, try using a shorter hose to see if the whistling noise goes away. A shorter hose will reduce the airflow resistance and may help to eliminate the noise.
2. Check for blockages: Inspect the hose and attachments for any clogs or blockages. Remove any obstructions that you find.
3. Clean or replace the filter: If the vacuum filter is dirty, this can cause airflow resistance and make the motor work harder, leading to the whistling noise. Clean or replace the filter as necessary.
4. Check the vacuum motor: If none of the above solutions work, you may need to inspect the vacuum motor for any issues. If you are not comfortable doing this yourself, you can take the shop vac to a professional for repair.

check for debris in the air intake. I've had leaves in mine make a similar noise

hissing vacuum leak at idle, louder with open throttle ...

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https://www.youtube.com/watch?v=tFoybr865n4
Jun 27, 2010 - Uploaded by fenixus
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A Whistle or metal sound with firing... - Honda Shadow Forums ...

www.hondashadow.net > ... > Technical Discussion

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Sounds to me like the bearings are going bad in the motor. The hotter it gets the grease breaks down and the squealing starts.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

The engine serpentine belt may be worn or wet. The belt slips, causing a high pitched squealing or whistle noise. The other possiblility is a bearing beginning to go out on one of your belt driven components

I HAVE A NEW PROPANE OVEN THAT I CONVERTED TO NATURAL GAS. NOW I GET A WHISTLE WHEN I USE THE OVEN ONLY. DO NOT GET A WHISTLE WHEN I USE THE TOP BURNERS.

this sounds odd but mine did this when i replaced the wipers. it seems the design of the wiper frame was making a whistle at higher speeds. the freestar wipers are exposed on the window cowl and not hidden so they endure the winds at high speed. it is worth a shot.

hi ,,two things 1- water pump. but most likely check your pulleys they will make that high pitch noise one of them fixing to go bad and what will happen the belt will jam and jump lose and will lose all power ,,cause you have one belt for alt and the water pump mostly its the pulley right under the alt ,,hope this will help ....Joe

We have summarised all possible problem for this case here to this link
http://www.fixya.com/support/r6008187-side_side_refrigerator_whistling_sound

There may be a small hole or cut in a vacum line or possibly just loose. Also make sure the air filter box and the big hose to it are secure and clamps etc are tight. Pulleys and belts can make a high pitch sound also.