How do you change coolant on 3000gt 1992?

To change the coolant on a 1992 Mitsubishi 3000GT, start by ensuring the engine is cool, then locate the radiator drain plug and place a container underneath to catch the old coolant. Open the drain plug to let the old coolant flow out, and once drained, close the plug. Next, remove the radiator cap and fill the system with a mixture of new coolant and distilled water, typically in a 50/50 ratio, until it reaches the proper level. Finally, run the engine for a few minutes with the heater on to circulate the new coolant and check for any leaks before disposing of the old coolant properly.