Thanks to everyone who helped me with my climate control problem on 1980 450sl.What I found was although Putting vac to the green pot and reading result with cont meter did not give clear results.It turned out that although the meter showed function under vac.It was not passing enough volts.I put in a new green vac pot and everything is like new.again thanks for all the help.Michael

Hey - Thanks for the update - ever notice on a lot of threads that people forget to post what worked to correct the problem? They sort of leave you hangin' . If members would take a sec like you to advise what solved the problem - we can all learn a little more.
Great feeling when the problem is solved - isn't it?

yeah thanks for the update.