How do you replace a adiator on a 2004 impala with 3400 engine?

To replace the radiator on a 2004 Chevrolet Impala with a 3400 engine, first ensure the engine is cool and disconnect the negative battery cable. Drain the coolant by removing the drain plug at the bottom of the radiator, then disconnect the upper and lower radiator hoses, as well as the transmission cooler lines if applicable. Remove the mounting bolts and any fan shrouds or electrical connections, then lift the old radiator out and replace it with the new one, reversing the disassembly steps to reassemble. Finally, refill the coolant system and check for leaks.