chevyguy14
Member
Hey guys I have a 2013 cat 247b3 that makes a grinding noise when I turn the ac on. If the ac button is off or if it’s blowing heat it doesn’t make the noise so I know it’s ac compressor or pump related. This year model has the hydraulically driven ac compressor so how do I diagnose if it’s the hydraulic pump that’s going bad or the compressor. Any ideas how to test them so I’m not taking a shot in the dark on which one’s going out or does anyone know which one is more prone to failure? Thanks