think in terms of two different metals with two different temperature
response ranges.  eventually they will be heated  once too often. (way
simplified), havent looked at the 84 computer  diagram but in most VW
from about  84 using digi  computers  the heat  sensors are wired into
the computer.  that means  they control  fuel mixture.  I  am  in the
middle of a project of extracting  an engine out of a 91 jetta which
had basically the same digi in the vanagons.  lots of  sensors tied to
the computer.
jimt
On Sunday, Sep 29, 2002, at 12:59 America/Denver, George Averill wrote:

> Does anyone know how the temp sending unit works, and why it would go
> bad?  I know that the resistance changes with temperature, but why
> would it go bad?
>
> George
>