Does the rad pressure thing work by forcing new fluid through until all the old is pushed out, kind'a like the brake bleeder? Or does it actually suck the system "dry" and then refill under pressure? And is it all done with the connection at the tank? Guessing that would mean it actually sucks the system dry. But how does it vent when putting coolant back in??
I bet that coolant system is similar in its workings to a system used for refrigerant. Probably a 3-way valve and vac pump; suck the old coolant out, change position of the 3-way valve and that allows fresh coolant mixture in. I could use one in my garage, but probably. It gonna happen- too much $$$ for way too little use- probably worth it to have shop with this setup do this every 3-4 years.
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