Of course only after asking the question do I finally find the writeup. This link has a terrific step by step guide.

http://w123maintenance.blogspot.com/2007/10/automatic-climate-control-unit-repair.html

Thanks!

__________________
Cousin Dave
83' 300SD 250k+ and going strong!

Take the best that exists, make it better!
If it doesn't exist, create it!
Accept nothing nearly right or good enough!