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Sorry that I haven't replied back sooner - I don't always catch the notification alerts.
As for the block drain on the car - I wouldn't bothered with it. It does make draining the cooling system faster - but you also can introduce air bubbles into the system that are tough to purge later. By draining only by the radiator and running the engine until the t-stat opens, you basically are purging the system as you are flushing it.
To save time - at step #5 - fill the system with 100% straight coolant, immediately after the last drain. Total system capacity is 6 quarts (both transaxles) - fill with 3 quarts of straight Toyota Red coolant, fill the rest of the system with distilled water.
The idea that a finite amount of water remains in the cooling system after you drain it. Filling 1/2 the capacity with straight coolant 1st + whatever portion of distilled water to be added to the system to top it off = nearly a 50/50 mix of coolant and water.
As for the block drain on the car - I wouldn't bothered with it. It does make draining the cooling system faster - but you also can introduce air bubbles into the system that are tough to purge later. By draining only by the radiator and running the engine until the t-stat opens, you basically are purging the system as you are flushing it.
To save time - at step #5 - fill the system with 100% straight coolant, immediately after the last drain. Total system capacity is 6 quarts (both transaxles) - fill with 3 quarts of straight Toyota Red coolant, fill the rest of the system with distilled water.
The idea that a finite amount of water remains in the cooling system after you drain it. Filling 1/2 the capacity with straight coolant 1st + whatever portion of distilled water to be added to the system to top it off = nearly a 50/50 mix of coolant and water.