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Arrived to find cause of whistling and chattering, found the filter was 100% blocked, changed filter and noise went away, went to start doing the ac maintenance and it started making the chattering again, checked system found blower wheel is very dirty and sounds like it’s off balance slightly and the motor has some shaft play. Checked blower motor capacitor, checked blower motor amp draw, checked all electrical connections and components, checked compressor amp draw, checked condenser fan motor amp draw, checked dual capacitor, checked refrigerant pressures.