They used 36 blowers because they were made for hard surface cleaning which is more than sufficient for that. They made a kit that diverts the water back to the fresh water box instead of the waste tank for cooling. Some guys replaced the apo's with electric ones, but I don't think that worked out any better. Some guys also bypassed the heat exchangers and installed diesel burners. Rob has a wand modification in his store that will allow you to put the wand down to move furniture with out over heating. The machine keeps building heat and shuts down at 270 degrees if water is not moving.
I have a 2007 Powerclean unit. I'm interested in the diverter kit. Do you know where I can get one. I also change my apo to an electric and it doesn't pump out under load. May have to put the old brass Jabsco back on.