It's the standard ARB compressor (not the newer compact). I haven't quite decided to part with my a/c yet. Heard that the ARB units are prone to blow at higher than the 90psi (iirc) required as a common complaint? I've only come across that they tend to burn up when used as a sole oba source to constantly do tires or keep a tank full. Might be time to have that ac refrigerant drained and get them regulated down 5 or 10 psi, but the front never gives me this trouble with their compressor and the same weight lube either. I did check the junctions with soapy water. They're all skookum.