David Richoux wrote:
>
> David Katsuki wrote:
> >
> > Where is there a coolant pressure sensor in the system?   I've never seen
> > one and don't recall
> > any reference to one in the manual.
>
> as I mentioned in another part of this thread, AFAIK the coolant pressure is
> determined by the temperature sensor - if the pressure is high the computer assumes
> that the temperature is high. That is what the techs at VWOA HQ told me
More like the other way around, IF the system is sealed.
But I don't think the computer is concerned about the coolant pressure.

>They may have been full of crap,

You called that one.

> but anyway, from the Bentley I cannot tell how the Temperature Sensor II actually
> works (thermocouple or pressure) - anybody know?
>
Semiconductor material with a NTC (negative temperature coefficient),
meaning that its resistance goes down as the temperature goes up.
  BTW a thermocouple is a junction of two different metals which
produces a small voltage which increases with temperature, not used in
stock vanagons, AFAIK.

Larry A.