[Shotimes] Thermostats and Temp Sensors

[Paul Nimz]

Yes the non-numerical gauge is rather vague and is why Ford used it.
Imagine if they actually put numbers on it.  They would have had to have
used an accurate gauge.  The best way is to measure the temp of the
water/coolant is as it exits the t-stat when completely warmed up and
cycling.  This can be done at flush time or with a surface IR pyrometer.  I
guess we are lucky to have the letters to go by.  Could have a gauge that
only has a C, H and a couple of lines.  :)

FWIW if a 10 ohm load is applied to the gauge it should read on the H, if a
74 ohm load is applied to the gauge it should read on the C.

In your case John I would guess the O R range is what the t-stat is rated at
and indeed it is the internal resistance of the gauge doing this.  Mine runs
on the M and is in the 190F range +-5F with a192F t-stat as measured at the
hottest surface point near the t-stat.

Paul Nimz
'97 TR SHO
'93 EG mtx SHO


----- Original Message -----
From: "John Weidenbenner" <johnjweid@earthlink.net>
To: "Paul Nimz" <pnimz@v8sho.com>; "Chris "Zap"" <zap@columbus.rr.com>;
<Shotimes@autox.team.net>
Sent: Sunday, March 02, 2003 9:22 AM
Subject: Re: [Shotimes] Thermostats and Temp Sensors


> After doing what Paul suggested twice over the years and replacing the
> radiator my 93 temp gauge still reads OR +/-. I am convinced that the
gauge
> itself is the cause of my high readings.
>
> My cooling fan seems to be cycling at the right temps. I checked that once
> with an IR temperature gauge.
>
> John W.
>
> ----- Original Message -----
> From: "Paul Nimz" <pnimz@V8SHO.com>
> To: "Chris "Zap"" <zap@columbus.rr.com>; <Shotimes@autox.team.net>
> Sent: Saturday, March 01, 2003 6:38 PM
> Subject: Re: [Shotimes] Thermostats and Temp Sensors
>
>
> > I would and did replace both at the same time.  Cost is a non issue and
> you
> > have the coolant drained anyway.  If you're really anal do the PCM
sensor
> > too.
> >
> > Paul Nimz
> > '97 TR SHO
> > '93 EG mtx SHO
> >
> >
> > ----- Original Message -----
> > From: "Chris "Zap"" <zap@columbus.rr.com>
> > To: <Shotimes@autox.team.net>
> > Sent: Saturday, March 01, 2003 5:46 PM
> > Subject: [Shotimes] Thermostats and Temp Sensors
> >
> >
> > > I know this has been a recent topic of discussion.  What I need to
know
> > is,
> > > do I need to replace both or not?  Recently the Temp gauge has been
> > reading
> > > up as high as the OR in NORMAL, where it usually used to be between AL
> all
> > > the time with slight fluctuation.  The radiator fan is also kicking in
> > when
> > > it does get hotter.  Does this mean that the temp sender is properly
> > > functioning, since the fan is also kicking in? (They use separate temp
> > > sensors, no?)  I'm guessing the thermostat is failing, as these
symptoms
> > are
> > > common but not always definite.  I just want to make sure I replace
the
> > > right part(s), but don't replace something that is working fine.
> > >
> > > Thanks,
> > > Chris
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