By pouring the fluid THROUGH the system as I described, you are using two quarts of fresh fluid, forced through the system to flush the junk out of the system and into the drain pan.

Merely sucking out fluid and replacing it will remove alot of the stuff that is ALREADY suspended in the fluid, but will not flush THROUGH the system dislodging junk that is around the valves, seals, and internal components.

Yes flushing with my method blows the fluid through VERY rapidly, and it takes only a matter of seconds to go through the two quarts, but this dislodges lots of stuff. After empty and the last of the fresh fluid is poured through, the system will be squeaky clean.

Hope this helps,