[T3] On my 73 square

William Jahn willjahn975 at gmail.com
Thu Sep 12 10:46:46 PDT 2019

What really kills me is in 2009 I got a brand new Bosch head temp sensor
sealed in the plastic in a box . I set it on top of my car and forgot and
drove off never found it.

On Thu, Sep 12, 2019 at 5:24 AM Jim Adney <jadney at vwtype3.org> wrote:

> On 11 Sep 2019 at 21:10, William Jahn wrote:
> >  I do know the head temp sensor in the car now does not always read the
> > same resistance at the same temp and when I removed it I could see a
> > dark area under that whitish plastic cover and when I pulled the cover
> > back I could see an area just above the top of the sensor where the
> > insulation was one , no broken strands yet they were dull copper not
> > bright clean so perhaps that might cause an issue .
> The missing insulation won't cause a problem unless it allows the center
> conductor to short to ground on the steel crimp. That will bring you to a
> halt
> very quickly, but is seldom a problem except on the '68-9 cars where that
> sensor is cramped under the #4 exhaust port. On those engines the wire is
> forced to make a hard right angle turn just past the crimp, and they can
> short
> there.
> Surface corrosion on the copper strands won't add enough resistance to be
> measurable to your instruments, or to matter to our FI. If water has
> gotten
> down into the sensor element itself, that could cause an increase in
> resistance, or an intermittent problem, because the sensor element is just
> a
> tiny little puck with contact made by spring pressure on each end.
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
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