Q: How to Service and Repair the Radiator Drain Plug on Buick LaCrosse?
A: The first task before radiator drain plug replacement is to drain all cooling system content. Start by removing the radiator drain plug through counterclockwise rotation followed by straight-forward extraction after observing how the seal remains attached to the plug. Clean the drain opening as well as the drain plug material. The installation process begins by setting the drain plug seal onto the drain plug stem before screwing the drain plug clockwise and verifying that the body stands completely inside the side tank. Finally, fill the cooling system.