How do you replace expansion valve on xj12?

To replace the expansion valve on a Jaguar XJ12, start by safely raising the vehicle and removing the necessary components to access the valve, which may include the dashboard or HVAC housing. Disconnect the refrigerant lines carefully, as refrigerant should be recovered by a professional. Remove the old expansion valve and install the new one, ensuring all seals are correctly positioned. Finally, reassemble the components, recharge the system with refrigerant, and check for leaks.