Hello, this is Ava with Think Crucial.
Before checking the possible causes for your machine being louder, please unplug the unit from the outlet.
Check the Pre and Post-Motor filters for debris. Dirty filters can restrict airflow. The pre-motor foam filter is square and located in a pull out tray underneath the dirt cup. The foam filter may be hand washed in cold water with mild detergent. Reinstall the filter when it is completely dry. The Multi-Layer Post Motor Filter is rectangular and located on the side of the machine. Note: The white Multi-Layer Post Motor Filter is not washable.
Detach the upper hose from the machine. Insert a broomstick into the hose to push any obstruction through to the opposite end.
Remove the screw from the left side of the lower hose on the back of the unit, and straighten this section of hose by pulling it down or lay the unit out flat, and roll the unit on its side with the lower house towards the top side. Look through the hose for any obstructions. Remove the hard plastic hose wand base (once held up by the single screw) to expose the lower hose. Push a broom stick through the lower hose to unclog. (The access plate can also be removed to provide a better view of the lower hose).
If you continue to experience excessive noise, you may need to contact Bisell by phone 1-800-237-7691 for further assistance.
You can purchase a wide variety of high quality Bissell replacement parts for your Bissell vacuum direct from Think Crucial with free shipping and an exclusive 10% coupon for Fixya.com readers, use code: FIXYA10
https://www.thinkcrucial.com/search?page=3&q=bissell&type=product
I hope this was helpful.
Ava B.
Think Crucial Customer Care
http://www.thinkcrucial.com/
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