How do you replace the radiator on a 1999 astro van?

To replace the radiator on a 1999 Astro Van, first, ensure the engine is cool and disconnect the negative battery terminal. Drain the coolant by removing the radiator drain plug and disconnect the upper and lower radiator hoses, along with any electrical connections. Unscrew the mounting bolts and lift the old radiator out, then install the new radiator by reversing the process, reconnecting hoses and electrical connections, and refilling the coolant. Finally, check for leaks and ensure the system is properly bled of air.