I have just finished getting my stock HZ aircon up and running. It works well but the blower fan is noisy. There are a couple of clips on the plastic blades, are these used for ''tuning''? Alternatively is there a bearing in there to grease? I had it rewound. I tried tightening the nut on the van but no good. Any help would be appreciated

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Make that tried to tighten the nut on the fan.