If it's a motor, let's see if it's a fan rubbing the shell or a motor bearing. If it is the friction problem of the impeller of the water pump. Another reason is that it may be caused by cavitation or other reasons.
If your pump is sold by the manufacturer during the warranty period, it will be OK. If there is no after-sales service, do it yourself! If it's about the fan,
That's easy. Maybe the screw of the fan cover is loose or there is something wrong with the fan. If it's an orientation problem,
Then you'd better replace the two bearings at the end of the motor. The premise is to find a suitable type of bearing, domestic: Harbin, Luoyang, Wafangdian these prices are suitable, imported: Japan Seiko (NTN, NSK), Switzerland SKF these prices are more expensive. However, I suggest that if it is a bearing problem, you'd better replace it with an imported bearing, because you use the pipeline pump as an air conditioning pump, and the working conditions and media requirements are different, so you should consider the use environment. If there is something wrong with the impeller, open it to check the friction position, whether the shaft is bent, whether the shaft is connected in series, and whether the impeller screw is loose.
Do you use vertical pipeline pump, horizontal pipeline pump or shielded pump? The structural drawings are all different.
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As for the rust of the gateway, it may be your pipe problem. If the pump body is cast iron, I suggest using cast steel or ductile iron for better effect. As I said before, you may be working as a hot water pump for general pipeline pumps in the market. In fact, you'd better use an air conditioning circulating pump, so there will be no rust problem, but the price is a little expensive, but it's worth it.