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
If it was the hydraulic motor driving the AC compressor starting to give up the ghost then there ought to be particles in the hydraulic filter maybe.? Other than that I got nuthin.
Possibly, I’ll give the filter a peek and see what I find. Thanks
You sure it isn't a bad condenser fan, of which there are two?