Spent some time troubleshooting yesterday afternoon, thanks to some excellent info from JCD. I think that I have both an electrical problem (resistance circuit--probably the amp and/or the ambient temp sensor) and a vacuum problem (center vents won't open, etc...)

Unfortunately while testing vacuum I tore the rubber on one of the "ports" of the vacuum lines-to-servo connector plug...anyone had luck repairing with silicone or should I go through the pain of replacing the rubber plug (how in the world do I get all those vacuum lines off the little brass barbs?) I have a spare rubber plug but it is also 20 yrs old--if I have to replace it, I guess I should go ahead and buy a new one, eh?

Also, anyone had any luck re-building the amp?

Thanks,
--=-=-=Ed

__________________
1978 300SD 149K miles silver-blue "Maxine" (mine!)
1979 300SD 318K miles red "Helga" (SOLD)
1980 300SD 321K miles yellow "Linda" (younger daughter's)
1980 300SD 148K miles blue (SOLD)
1980 300SD 153K miles green(parts car, SOLD)
Yes, I have a W116 fetish :-)