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Thanks, Randall. I really like the idea of T'ing off the heater return. Looks
like 3/8ths but don't know for sure until I break it down. Meanwhile, when I
opened the Spal fan box, I see the thermostat switch failed to make it into the
packaging. Much to late to go to the dealer. On Amazon I see a variety of
thermo fan switches 185/195, but none seem rated very well. Could be poor
wiring, I suppose.
Any recommendations on thermo fan switches?
Terry Smith, '59 TR3A
New Hampshire where we're always complaining...bugs, mud, cold, freezing cold,
icy cold, sleety cold, ...and now heat.
> On July 20, 2019 at 12:27 PM Randall <tr3driver@ca.rr.com> wrote:
>
> I believe it could be done, but not with standard electronics.
>
> Most fan controls are looking for a contact closure, so obviously they
> aren't going to work with a gauge sender.
>
> Even with a fan control that expects a variable resistance (like the
> gauge does), it will "read" that resistance by passing a current through it,
> and measuring the resulting voltage. The gauge does the same thing. But with
> current from two sources, the voltage will be much higher, which will confuse
> both fan and gauge.
>
> One way around that is to build your own fan controller that only looks
> at voltage. Not hard to do, one IC, one transistor, and a handful of
> resistors will do the job. But probably more than most want to tackle. It
> also makes fan operation depend in the gauge, which might not be desirable.
>
> FWIW, since my car lacks the optional heater, it was easy to mount a fan
> sensor in the heater return fitting on the water pump housing. Although I did
> not try it, I believe you could put a tee in that hole, and connect both
> heater return and fan sensor. Heater operation would affect the fan to some
> extent, but I think not enough to matter.
> -- Randall
>
> On 20 July 2019 11:08:18 GMT-05:00, TERRY SMITH <terryrs@comcast.net>
> wrote:
>
> > >
> > I'm still researching this but thought I'd ask anyway. I've a Spal
> > pusher fan with a thermostat from years ago I never installed. Deciding to
> > install it because the 3 is running fine at thermostat temp on the road,
> > but shortly after I shut down in this heat it barely starts again and runs
> > rough until the float bowls clear. Letting the fan run after shut down
> > ought to help keep the float bowls from overheating.
> >
> >
> > Awhile ago I installed SunPro electric temp guage and sending unit.
> > So question. Can you use the same temp gauge sending unit as the temp
> > sensor for the fan also? The temp gauge sensor uses some sort of
> > resistance affected by heat, I suppose, but whether the fan reads it the
> > same as the gauge is puzzling.
> >
> >
> > Thanks, everyone (again!)
> >
> > Terry Smith '59 TR3A
> >
> > New Hampshire
> >
> > >
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<meta charset=3D"UTF-8">
</head><body><p style=3D"font-size: 12pt; font-family: helvetica,arial,sans=
-serif; color: rgb(51, 51, 51);">Thanks, Randall.  I really like the i=
dea of T'ing off the heater return.  Looks like 3/8ths but don'=
;t know for sure until I break it down.  Meanwhile, when I opened the =
Spal fan box, I see the thermostat switch failed to make it into the packag=
ing.  Much to late to go to the dealer.  On Amazon I see a variet=
y of thermo fan switches 185/195, but none seem rated very well.  Coul=
d be poor wiring, I suppose.  <br></p><p style=3D"font-size: 12pt; fon=
t-family: helvetica,arial,sans-serif; color: rgb(51, 51, 51);"><br></p><p s=
tyle=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; color: rg=
b(51, 51, 51);">Any recommendations on thermo fan switches?<br></p><p style=
=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; color: rgb(51=
, 51, 51);"><br></p><p style=3D"font-size: 12pt; font-family: helvetica,ari=
al,sans-serif; color: rgb(51, 51, 51);">Terry Smith, '59 TR3A<br></p><p=
style=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; color: =
rgb(51, 51, 51);">New Hampshire where we're always complaining...bugs, =
mud, cold, freezing cold, icy cold, sleety cold, ...and now heat.<br></p><b=
lockquote type=3D"cite">On July 20, 2019 at 12:27 PM Randall <tr3driver=
@ca.rr.com> wrote: <br> <br>I believe it could be done, but not with st=
andard electronics. <br> <br>Most fan controls are looking for a contact cl=
osure, so obviously they aren't going to work with a gauge sender. <br>=
<br>Even with a fan control that expects a variable resistance (like the g=
auge does), it will "read" that resistance by passing a current thr=
ough it, and measuring the resulting voltage. The gauge does the same thing=
. But with current from two sources, the voltage will be much higher, which=
will confuse both fan and gauge. <br> <br>One way around that is to build =
your own fan controller that only looks at voltage. Not hard to do, one IC,=
one transistor, and a handful of resistors will do the job. But probably m=
ore than most want to tackle. It also makes fan operation depend in the gau=
ge, which might not be desirable. <br> <br>FWIW, since my car lacks the opt=
ional heater, it was easy to mount a fan sensor in the heater return fittin=
g on the water pump housing. Although I did not try it, I believe you could=
put a tee in that hole, and connect both heater return and fan sensor. Hea=
ter operation would affect the fan to some extent, but I think not enough t=
o matter. <br>-- Randall <br> <br><div class=3D"ox-71661db6d1-gmail_quote">=
On 20 July 2019 11:08:18 GMT-05:00, TERRY SMITH <terryrs@comcast.net=
2; wrote:<blockquote><p style=3D"font-size: 12pt; font-family: helvetica,ar=
ial,sans-serif; color: #333333;">I'm still researching this but thought=
I'd ask anyway.  I've a Spal pusher fan with a thermostat fro=
m years ago I never installed.  Deciding to install it because the 3 i=
s running fine at thermostat temp on the road, but shortly after I shut dow=
n in this heat it barely starts again and runs rough until the float bowls =
clear. Letting the fan run after shut down ought to help keep the float bow=
ls from overheating.  <br></p><p style=3D"font-size: 12pt; font-family=
: helvetica,arial,sans-serif; color: #333333;"><br></p><p style=3D"font-siz=
e: 12pt; font-family: helvetica,arial,sans-serif; color: #333333;">Awhile a=
go I installed SunPro electric temp guage and sending unit.  So questi=
on.  Can you use the same temp gauge sending unit as the temp sensor f=
or the fan also?  The temp gauge sensor uses some sort of resistance a=
ffected by heat, I suppose, but whether the fan reads it the same as the ga=
uge is puzzling.<br></p><p style=3D"font-size: 12pt; font-family: helvetica=
,arial,sans-serif; color: #333333;"><br></p><p style=3D"font-size: 12pt; fo=
nt-family: helvetica,arial,sans-serif; color: #333333;">Thanks, everyone (a=
gain!)<br></p><p style=3D"font-size: 12pt; font-family: helvetica,arial,san=
s-serif; color: #333333;">Terry Smith  '59 TR3A<br></p><p style=3D=
"font-size: 12pt; font-family: helvetica,arial,sans-serif; color: #333333;"=
>New Hampshire<br></p></blockquote></div></blockquote><p style=3D"font-size=
: 12pt; font-family: helvetica,arial,sans-serif; color: #333333;" class=3D"=
default-style"><br> </p></body></html>
=20
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