After draining the coolant and replacing the thermostat, gaskets and most of the hoses, I no longer have a leak. But after the initial filling of the holding tank, I am guessing that I will need to start the car to add the rest of the fluid. I want to make sure before I start the car that I am indeed doing the right thing. 1) Start car and watch holding tank drain 2) Continue to add fluid 3) When tank stays at proper level and engine is warm...stop. 4) Check for leaks 5) Close cap Is it that simple??