Is a trans flush thru the cooler a total waste of money?

[96eb96]

Seems these transmissions have a thermal bypass. From this diagram(in the link), the torque converter will not release fluid until you reach probably 180degrees. So, you are exchanging your expensive fluid right back into waste. Would be almost impossible to keep fluid hot at idle. The idea is to heat the fluid so it reaches operating temperature.

This is not the case with the v8 4r70ws.

5R55S Cooler Thermal Bypass fix - Documents