How to Clean Blower Wheel on MRCOOL Mini Split: A Comprehensive Guide

Maintaining the cleanliness of your MRCOOL mini split’s blower wheel is crucial for optimal performance, energy efficiency, and prolonged lifespan of the unit. This comprehensive guide will walk you through the step-by-step process of cleaning the blower wheel, ensuring your HVAC system operates at its best.

Accessing the Indoor Unit

  1. Power Down the Unit: Before beginning any maintenance work, ensure that the power to the MRCOOL mini split is turned off at the circuit breaker. This is a crucial safety precaution to prevent any electrical hazards.

  2. Remove the Indoor Unit Cover: Locate the screws securing the indoor unit’s cover and use a screwdriver to remove them. Gently lift the cover to access the internal components.

  3. Lower the Drain Pan: Carefully lower the drain pan, taking care to remove any accumulated water before proceeding. This will provide better access to the blower wheel and other components.

Removing the Blower Wheel

how to clean blower wheel on MRCOOL mini splitImage source: nan

  1. Locate the Set Screw: Identify the set screw that secures the blower wheel in place. Use the appropriate Allen wrench or hex key to loosen and remove the set screw.

  2. Detach the Coil: To access the blower wheel, you will need to remove the screws along the side of the unit that hold the coil in place. Carefully move the coil out of the way, taking note of its orientation for proper reassembly.

  3. Extract the Blower Wheel: Gently pull the blower wheel out of the unit, ensuring that you do not damage any surrounding components.

Cleaning the Blower Wheel

  1. Prepare the Cleaning Solution: Mix a mild, safe cleaner like Refrigeration Technologies Viper EVAP+ with water in a spray bottle or bucket, following the manufacturer’s instructions for the appropriate dilution ratio.

  2. Spray and Scrub: Thoroughly spray the blower wheel with the cleaning solution and use a soft-bristled brush or cloth to gently scrub away any accumulated dirt, dust, or debris.

  3. Rinse and Dry: Rinse the blower wheel with a hose or clean water to remove any remaining cleaning solution. Ensure that the blower wheel is completely dry before proceeding with reassembly.

Reassembling the Unit

  1. Reinstall the Blower Wheel: Carefully insert the blower wheel back into its original position, ensuring that it is properly aligned and secured with the set screw.

  2. Reattach the Coil: Reverse the steps you took to remove the coil, making sure to align it correctly and secure it with the screws.

  3. Replace the Drain Pan: Carefully lift the drain pan back into its original position, ensuring that it is properly seated and level.

  4. Reinstall the Indoor Unit Cover: Replace the indoor unit cover and secure it with the screws you removed earlier.

  5. Power On the Unit: Restore power to the MRCOOL mini split by turning the circuit breaker back on.

Specialized Cleaning Tools and Solutions

For a more thorough and effective cleaning, consider using specialized tools and solutions designed for HVAC systems:

  1. Turbo Tank by Nu-Calgon: This pressurized sprayer is specifically designed to deliver cleaning solutions to hard-to-reach areas, making it an excellent choice for cleaning blower wheels and other HVAC components.

  2. Viper Coil Cleaner by Refrigeration Technologies: This industry-leading coil cleaner is formulated to tackle stubborn dirt, grime, and buildup on HVAC components, including blower wheels.

  3. Coil Brush: A dedicated coil brush with stiff bristles can help dislodge and remove any stubborn debris from the blower wheel’s surface.

Remember to always follow the manufacturer’s instructions and safety guidelines when using any cleaning tools or solutions.


Regularly cleaning the blower wheel on your MRCOOL mini split is a crucial maintenance task that can help ensure optimal performance, energy efficiency, and extended lifespan of your HVAC system. By following the step-by-step guide outlined in this article, you can confidently tackle this DIY project and keep your mini split running at its best.


  1. MRCOOL Indoor Unit Disassembly and Blower Wheel Removal
  2. Cleaning HVAC Coils and Blower Wheels
  3. How to Clean a Mini Split Air Conditioner Blower Wheel