I just did it. It is actually not bad at all.....if you take the short cut of cuttin the plastic rail that holds up the glove box.
From under the bonnet at the firewall there are the black plastic clamps surrounding the two pipes. Use a pick or something with small point and press down on the two brass squares to release the clamp. Once they are off just pull the two pipes straight out. Make sure the system has been evacuated and under no pressure before removing the clamps.
Take off glove box with two screws on bottom. Two screws on top corners takes out the black plastic liner. Unhook couple electrical connectors you will see. Then two gold screws takes off the small black box from evaporator cover. Take off narrow filter cover on right side of evaporator (about 4" long). Take out two filters. Then 8 small screws takes off the evaporator cover. Then the evaporator pulls out. Really tight by holding both ends of already cut plastic rail.
Expansion valve has the two allen screws. Mine were pretty corroded and hard to get out. I sprayed liquid wrench on it. Using allen head inside socket and ratchet, it finally came out. i replaced the bolts with hex head stainless bolts. After removing. Make sure to replace two O-rings on the new evaporator going into expansion valve, two O-rings on pipe connector goin into other side of expansion valve and two O-rings on each of the steel lines under hood.
Replace evaporator in reverse order.
IMO, when cutting the plastic rail under glove box...... it may be better to use a small hack saw (the smallest sharpest blade possible). Make the cut just to the right of the left screw hole so there is more support to hold glove box. Make the cut at an angle so that the long side to the right can fit back on the left side with more surface area to glue back...if that makes sense.
