I have my 1980 300td at an electrical specialist right now, having given up trying to troubleshoot my ACC II (servo system).

He he has found issues with the vacuum hoses and is trying to find the main vacuum switch (term may not be exact).

He says that according to the wiring diagram and other docs I provided, the blower won't run without that switch working.

He can't find it inside the dash. I don't recall ever hearing of it.

I have tried googling it but what comes up is the switchover valve on the firewall on turbo models.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22