[Vwdiesel] 1984 Rabbit Diesel- taming the hothead

[Val Christian]

Yes, there is a separate temp switch which runs the fan on HIGH
when coolant temps get high.  I think you'll find it in parallel
with the AC switch.

The beauty is that there are two points of failure, so that simply one
switch failing will not shut you down.  The downside is that you have to
notice it.

Val




>
> Question:
>
> On the two-speed cooling fan systems (I think its A/C
> specific, and perhaps TD specific too, correct?) AFter
> the fan comes "on" on low speed, if the engine still
> gets hotter (like climing a grade), will the fan turn
> on "High Speed" at some point? Just curious. Mine
> never seemed to get hot enough to do this. The fan
> definitely cycles between "High " and "Low" with the
> A/C on, though, but this because of a pressure switch
> in the "High" side line on the A/C system to cool the
> condensor and certain R-12 pressures.
>
> --Nate
> --- Scott Kair <scott3491 at insightbb.com> wrote:
> > Hagar,
> >     Just caught this in re-reading your message:
> >
> >     >>Scott .    Q:  did fan work     A:   did not
> > notice.       checked it
> > in driveway , it is a two speed    used jumper on
> > radiator plug -- a-ok both
> > speeds. Then let it idle   when temp reached red fan
> > started.  Lab
> > thermometer in expansion tank showed 200 F.<<
> >
> >     Something is amiss, either with your
> > thermosensor or your dash gauge.
> > While I've never used a lab thermometer to check
> > when the fan should kick
> > on, every VWD I've ever had turned on the fan at
> > around the 3/4 mark.  And
> > 200F sounds a bit low for it to be the red zone,
> > although a good point for
> > the fan to kick on.
> >     Maybe some of the other guys would have more
> > experience in that area, as
> > overheating is definitely a critical issue.
> >     Scott Kair
> >
> >
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>
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