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1 Symptom Unit exhibits heavy vibration and causing rattling noise. 2 Cause Imbalance blower wheel causing the unit to have heavy vibration. Blower wheel cover vibration and rubbing against foam air guider causing the rattling noise. 3 Remedy Change the blower wheel to a new improved blower wheel (With additional 2 ribs. Part number remain H01K1014). Attached EPT seal at the particular location of blower cover and intake grille.