My experience with most service technicians I have encountered is few have a clear understanding of the correct procedure to test DCA. I have been testing my own since acquiring the coach, and change the anti freeze using OEM Cummins Compleat low silicate antifreeze precharged with DCA.
I have seen demonstration samples of the effects of cavitation on display, but do not know how to recognize the symptoms of the problem when it occurs.
Many motorhome owners have not tested their cooing systems because dealers frequently don't bother explaining the procedure and since most service techs don't know how to do it correctly, I suspect there are many coaches displaying the effects of cavitation.
I'd like to know how to recognize the effects of cavitation for that reason.