No, the EAS is fine, now it's the AC

Just a few seals here and there, and a quick reset with one of Storey's cables, and the air bags are inflating like they should.

Now it's the A/C. I'm finding that it quits working when the temperature gets above about 90 degress f. or so. It sounds a lot like the three way switch adventures listed here http://rangerovers.net/newrremedies.htm#airconditioning on the common fixes page. When the temperature is lower, the A/C runs like a champ for hours on end. I've had it recharged, pollen filters are cleaned (although my new ones are on order since I'm due for my annual filter swap).

Has anyone had similar symptoms caused by anything BESIDES the 3-way switch? And when I go to swap this thing, I'm suspecting the system will need to be evacuated, right? Shop manuals are not exactly clear on this point.

thanks!!!