Air con compressor noice I think it's a bearing noice

@aza77644 could very well be but could also be a clutch noise and a few other things. Those compressors work hard and the bearings do fail. Unless you have all the right tool to disassemble your compresor, it might be better to replace it. Your old compressor usually gets returned to the store for a rebuilt and most stores offer a core charge. Of course, that will all depend on where you are. Anyhow, if you tell us the exact year, model number and engine size of your Mazda, we can try and narrow down the repair on your compressor.