Ok, yet another "new" thing. My ac and flaps appear to work ok, but once in a while I hear a clicking from passenger side near trans tunnel up by lower dash. If I switch CCU off, it goes away. Is this an indication that the vacuum control manifold/elect. is starting to go? Is it possibly repairable?
Thanks!
'87 300SDL

Yes, it's gone. Don't believe that model is repairable.

Thanks..something to do this weekend

fellow engineer jeremy5848 cracked one open and found bad solder joints...

http://www.peachparts.com/shopforum/diesel-discussion/281695-w124-climate-control-vacuum-valve-repair-diy.html

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech