The AC system in your Lexus IS250 has an accumulator-drier, compressor, condenser, evaporator, and expansion device. The AC compressor supplies and regulates the liquid refrigerant throughout the system. The AC system has a high pressure side and a low pressure side. The compressor is mounted between these two sides for maintaining the pressure difference and regulating refrigerant gases. It has a piston which gets moved up and down to draw the refrigerant and compress it.
If your Lexus IS250 AC compressor is not functioning properly, you need to get it fixed at the earliest. Buy Auto Parts has a wide range of car parts which have been tested to meet or exceed industry standards. We sell new and genuine replacements and premium aftermarket parts at affordable prices.