Whining Noise at 2500-4000 RPM: Causes & Fixes

The air conditioning is running. What could be the problem? Could there be a leak? I had the refrigerant topped up two months ago, and now the air conditioning isn't cooling properly again (it wasn't great even then, but it's worse now). If there's a significant leak (that's hissing), shouldn't the refrigerant be leaking out even faster?

Best regards, WarLord.

Hello,

Are you sure it's coming from the air conditioner? It sounds a bit like there might be leaks in the charging pressure system.

It's 100% related to the climate. When I turn off the air conditioner, it stops, but when I turn it back on, it might take a second, and then it starts hissing again.

Edit: It now sounds like there's something wrong with the system, and it's getting worse. It almost sounds like the compressor is falling apart (ugh, those things cost a fortune).

Best regards, WarLord.

Does anyone have a suggestion?

Best regards, WarLord.