The A/C expansion valve is very reliable in that car. I would not change it unless there is a known problem with it. What you do want to change is the reviever dryer. This componet is the part that keeps ice from plugging up the expansion valve. And after 1 year of exposure to the atmosphere through the cuts in the hose, it has lost its ability to absorb moisture & dirt from the system. One other componet that tends to wear out in that car would be the A/C suction line. I would grab part of the rubber hose near an end and try to rotate the hose. If you can rotate the rubber hose in comparison to the metel hose it is connected to it is wearing out and now is the time to replace. Best of luck. John