How do you replace the expansion valve on a 2001 Mazda Miata?

To replace the expansion valve on a 2001 Mazda Miata, first, ensure the AC system is fully discharged to avoid refrigerant exposure. Remove the dashboard or center console to access the HVAC unit, then disconnect the AC lines from the expansion valve. Replace the old valve with a new one, ensuring all O-rings are lubricated and properly seated, and then reassemble the components in reverse order. Finally, recharge the AC system with refrigerant and test for proper operation.