And probably was never a problem though upgrading the compressor from the Hitachi to the AMK is probably a good thing. Just may not have been needed at the time - maybe was needed.
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It was a problem first time around. The compressor ran nonstop for nearly half an hour until I could find a spot to stop, and it made a rather nasty noise. Normally I wouldn't have heard the compressor while driving but this became very loud. This event was why I listened carefully to the new one.
That's the sort of behaviour I was getting out of my hitachi before I turfed it - noisy and running too long. The AMK is a great improvement and I'm happy I changed to it before the hitachi gave me any real grief.