I am going to do a cooling system flush and after some reading and watching some YouTube videos I noticed that people take different approaches. So I have the following questions:
I understand that after you have drained the cooling system and filled it up with distilled water you are supposed to turn the car on letting the engine reach normal operation temperature to allow for the thermostat to open (in addition to turning the heat on so that the water also flows through the heater core). But I have also come across some people that suggest removing the thermostat. Is it necessary to remove the thermostat since it's going to open when engine reaches temperature?
The Haynes Repair Manual for my Nissan Maxima 2002 states to remove the two engine drain bolts on each side after draining the radiator. In case I am not able to locate these two bolts, Is that a strictly necessary step since hopefully as water runs through the system the engine block coolant should be pushed out by the water eventually correct?
In the videos I watched, the process of flushing is suggested to be repeated until clear distilled water comes out. I noticed that they put the radiator cap back on after each flush. I am going to use the yellow Spill Free Funnel from Lisle for this project. Can I just leave the funnel in the radiator at all times while doing this process and keep adding water until it comes out clean and this way I do not have to hustle with closing radiator cap, then waiting for it to cool down each time?
Finally, I have two gallons of 50/50 mix to perform the refill. Will these 2 gallons fill the overflow reservoir tank as well if I pour them through the radiator cap? Or do I have to fill the overflow tank separately?
Thanks in advance.