Going to change out coolant in 03.
Planning on running Shell Rotella ELC concentrate 3.5 gallons, and 3.5 gallons of distilled water.
As for the flush, I drain the radiator. Where are the plugs on the back of the block? I think I located one, but it is an allen wrench type bolt, where is the one on the passenger side?
Also, after I drain all the coolant, do I just fill it up with water and run it until the thermostat opens or just leave the drain plugs out and run water through the system with a hose?