I don't know ~ I assume it'll be behind the center of the dash , not far from the blower switch . look for green pipes .
-Nate
Jim wrote :
>
> Yeah, I can't figure out why the system would need to verify or use any vacuum. Where would that relay be located? Is it behind the control panel in the middle of the dash underneath the center vents? The only thing I can figure is maybe there is one vacuum element underneath to control the flapper for external air vs recirculate...? Everything else in the heating & a/c system is definitely manual controls via cables.
>
> Jim
>
>
>
> --- In diesel_mercedes@yahoogroups.com, "Nate" <vwnate1@> wrote:
> >
> >
> > There's a vacuum operated power relay , I wasn't aware the 240D's with manual HVAC controls used it though ~ look for a green plastic pipe , that's the HVAC vacuum feed .
> >
> > -Nate
> > Jim wrote :
> > >
> > > 1982 240D
> > > I thought the vacuum wasn't mixed up with the heating & a/c system on this car but today I busted a side nipple off the main vacuum tube from the vac pump to the brake booster (aka brake booster vacuum tube). The usual stuff happened...door locks, engine shutoff, but also, the heater blower motor would not work. I thought the vacuum was a separate system in the 240D. The 240D has cables to operate everything in the heater and a/c system, doesn't it? Anyhoo, when I replaced the vacuum tube, the blower motor started working again no problem. So my question is, how does a vacuum outage cause the heater blower motor to not work?
> > >
> > > Jim
> > >
> >
>
