Q: My car makes a loud screeching noise whenever I turn the ac on, it stops after a few seconds. Could this be a bad compressor?

Hi there:

It is very possible that your AC compressor is the source of this type of noise. Much like other accessories driven by the engine’s belts, the AC compressor has several interior components and uses a sealed bearing to turn. If any of the interior components break, or the compressor’s internal bearings fail or seize, then all sorts of noises can be produced as a result. You might want to更换交流压缩机或让专业的机械师完成AC系统检查，以确定为什么存在噪声并建议正确的维修。