Ya, I know about the drain valve. I was wanting to actually flush it out and clean the system. JD makes some stuff that cleans system before refilling with new. Just wanted to know if anyone had done it this way using a cleaner first.
I did my X749 with Preston super flush. I first drained the system then added the super flush and filled with distilled water ran it up to temp, drained and did two more flushes with just distilled water to make sure all the super flush was out of the system then filled with JD Cool Gard 2 pre mix. I was changing the thermostat so I left it out to do the flush. If you have your thermostat in place make sure it opens so you flush the whole system.:trink39: