How do you remove and replace crankcase ventilation system on 6 cylinder 3.0 Liter - DOHC 2002 mercury sable?

To remove and replace the crankcase ventilation system on a 2002 Mercury Sable with a 3.0-liter DOHC engine, first disconnect the negative battery cable and remove any engine covers for access. Detach the PCV valve from the valve cover and remove any associated hoses, ensuring to check for any clamps that may need to be loosened. Install the new PCV valve by reversing the removal steps, ensuring all connections are secure, and then reattach the battery cable. Finally, start the engine to check for proper operation and any leaks.