my vacuum smells awful, like burning dust, even with clean filters.

Diagnosis

The burning dust odor in the Bissell CleanView Swivel Pet 2252 is typically caused by "bypass dust." This occurs when microscopic particulates leak past the primary filtration system and settle directly onto the motor's armature and carbon brushes. Because the motor operates at high RPMs, these particles heat up rapidly, effectively "toasting" the dust and creating a pungent, acrid smell that mimics electrical burning. This is often triggered by a momentary breach in the seal of the dirt tank or a microscopic tear in the pleated filter. Once the dust coats the motor windings, it creates a thermal blanket that traps heat, which can lead to premature motor failure if not addressed. You can confirm this by running the vacuum for two minutes and then sniffing the exhaust vents at the rear of the unit; if the smell is concentrated there rather than at the brush roll, the motor housing is contaminated.

How to Fix It

To eliminate the odor, you must perform a deep-clean of the internal motor chassis and airflow paths. Follow these steps precisely:

1. Disconnect the power cord from the wall outlet and allow the unit to cool for at least 30 minutes to avoid damaging the motor housing.
2. Remove the dirt tank and the pleated filter. Inspect the rubber gasket on the tank lid for any cracks or debris; wipe it clean with a damp cloth to ensure an airtight seal.
3. Using a can of high-pressure compressed air (like Dust-Off), insert the nozzle into the motor intake vents. Direct the bursts of air outward—away from the motor—to push trapped dust out through the exterior cooling vents. Do not blow air directly into the motor core, as this can jam debris into the bearings.
4. Use a handheld vacuum or a shop vac to clear the external exhaust grilles on the back of the chassis. This removes the "burnt" particles that have already been expelled but are clinging to the plastic.
5. Replace the pleated filter with a brand new OEM filter. Even if the old filter looks clean, the pores may be compromised, allowing the bypass dust to enter the motor.
6. Run the vacuum on a high-traffic area for 5 minutes to flush out any remaining airborne particles from the internal housing.

If That Didn't Work

• Inspect the Brush Roll Belt: If the smell persists, check the drive belt. A slipping or frayed belt creates a rubber-burning smell that is often mistaken for dust. Remove the bottom plate and check for melted rubber residue or a loose belt that is rubbing against the plastic housing.
• Clean the Pre-Motor Foam: Some versions of the 2252 have a secondary foam screen. If this is saturated with oils from pet dander, it restricts airflow, causing the motor to overheat and "cook" the remaining dust. Wash the foam with warm soapy water, rinse thoroughly, and let it air dry for 24 hours.
• Check for Hose Obstructions: A partial clog in the flexible hose creates back-pressure. This forces air to leak through the seals and into the motor compartment. Use a broom handle to push through the hose to ensure there is a completely clear path from the floor head to the tank.
• Motor Brush Wear: If the smell is accompanied by sparks visible through the motor vents or a grinding noise, the carbon brushes are likely worn down to the commutator. This is a mechanical failure and requires a professional motor replacement or a full unit swap.

Heads Up

• Never wash the pleated filter with soap; use a dry shake or a low-pressure air blast. Soap residue can clog the microscopic pores, increasing back-pressure and causing the motor to overheat.
• Empty the dirt tank when it is 50-60% full. Waiting until it is completely full forces the motor to work harder and increases the likelihood of dust bypassing the filters.
• Avoid vacuuming fine powders (like drywall dust or fireplace ash) with this model. These particles are small enough to penetrate the filtration system and will coat the motor instantly, leading to the burning smell.
• Check the brush roll for tangled hair every two weeks. A jammed brush roll puts immense strain on the motor, raising the internal temperature and accelerating the "burning" of trapped dust.