The hand-held temp sensor units are standard automotive diagnostic tools
these days. Can be acquired from a variety of automotive supply houses.

John Rodgers
88 GL Driver

Andrew Fox wrote:
>
> John's original message states:
> >Radiator fan didn't appear to be coming on
> >when the gauge read hot. I could place my palm on the "hot" radiator and
> >hold it there comfortably. Front heater blew lukewarm air.
>
> Does anyone think that John's temperature gauge may be giving a false
> reading?  If his radiator fan is coming on when the guage gets way up there
> then maybe his temp gauge is reading wrong.  Maybe he has a faulty volatage
> regulator.  John, check the voltage at the voltage regulator, its behind
> the tachometer.  It should be 10.5 volts i think.  Bentley shows a picture
> and gives the correct volatage range.
> Does anyone know the resistance values for the temperature gauge at various
> levels?  Right now i'm struggling with a similar problem as John but I
> figured there must be something wrong with my gauge becasue when i let the
> car idle for awhile the radiator fan comes on when the heat gauge is almost
> up to the upper white line.
>
> Of course the only way to test what's really going on is to use one of
> those external hose temperature sensors that nasa developed.  Maybe becasue
> of internal hose deterioration the coolant temp at the engine is hot but
> cooler up front at the radiator.  Anyone know where to get one of these
> sensors, or what company makes them?
>
> Thanks,
> Andrew Fox
> 86' auto westy