How do you replace the coolant bypass pipe on a 2003 Pontiac aztek?

To replace the coolant bypass pipe on a 2003 Pontiac Aztek, first, ensure the engine is cool and disconnect the battery. Drain the coolant and remove any components obstructing access to the bypass pipe, such as the air intake duct or engine cover. Unscrew the old bypass pipe from the engine block, clean the area, then install the new pipe with a new gasket if needed. Reassemble everything, refill the coolant, and check for leaks.