How do you put coolant in new rad?

To add coolant to a new radiator, first ensure the engine is cool to avoid burns. Locate the radiator cap, remove it, and use a funnel to pour the recommended coolant mixture into the radiator until it reaches the fill line. After filling, replace the radiator cap securely and check the overflow reservoir, adding coolant if necessary. Finally, start the engine and let it run for a few minutes while checking for leaks and ensuring the coolant circulates properly.