About a month after the original post (2002) I resoldered my climate control unit and did not have any further problems until this week. It is now failing to open some of the dampers until it has been operation for a few minutes and during the first few minutes it has a random clicks as though a relay is trying to pick but drops out. Once the clicking stops the system seems to work as designed. I will be removing it again to check to see if resoldering it again will be another cheap fix.

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Dave
88 300E 250K Sold
2000 C230K Totaled @104K
2003 ML320 156K Sold
2009 E350 4Matic Sport 46K Sold
2011 ML350 60K Sold
2014 GLK350 46k Sold
2012 GL450 67K
2016 E550 Cabriolet 48K