Thermostate Setting for Failing Squarrel Fan

[Scott Forman]

OK...still fighting this project, need some suggestions.

Everything is mounted and installed, but I cannot get the fan to
engage from the original thermostat. When I apply a flame to the
thermostat, I can hear it click and a small voltage begins flowing to
the original squirrel-cage wire. The problem, though, is that the
voltage at that wire is very weak, varying from less than 1 volt to
around 5. I cannot identify anything that makes the voltage change.
This voltage is not enough to close the relay and turn the fan on.

Any suggestions as to what is causing the voltage to be low or how to
fix it? I guess this may be the reason the original fan quit working
in the first place.

Scott

--- In WanderlodgeForum@yahoogroups.com, "Howard O. Truitt"
wrote:
>
> Scott,
> That would be a safe assumption.
> Howard T, Sowega, 86 PT40
>
> ----- Original Message -----
> From: Scott Forman
> To: WanderlodgeForum@yahoogroups.com
> Sent: Saturday, August 18, 2007 3:36 PM
> Subject: [WanderlodgeForum] Re: Thermostate Setting for Failing
Squarrel Fan
>
>
> There are two wires going to my original fan, green & yellow. Is
it
> safe to assume green is ground and yellow is hot?
>
> Thanks
> Scott
>
> --- In WanderlodgeForum@yahoogroups.com, "sfedeli3" <sfedeli3@>
> wrote:
> >
> > Scott,
> > Use the 12V + wire going to the squirrel cage fan as
a "trigger"
> for
> > a Bosch style relay. You will want to supply the main voltage
to the
> > fan directly from a 12V source in your charger/Rediline
compartment.
> > The fan will draw better than 12 amps, which would burn out the
> > thermostat contacts over time if you don't use the relay. Be
sure to
> > also use 10 or 12 ga. wire for the fan. The trigger wire from
the
> > squirrel cage can be lighter size since it does not carry much
of a
> load.
> > I located the Bosch relay in the charger compartment and ran the
> > wires from the squirrel cage and to the fan through a 1/2" hole
in
> the
> > compartment wall. Make sure to use a grommet to prevent chafing
and
> > try to enclose all of the wires in wire loom or some sort of
> conduit.
> > If you are not familiar with how to wire the relay, this is a
great
> > project for learning- there are numerous links floating around
the
> web
> > with instructions. Also be sure to install a 20 A fuse between
the
> 12V
> > source and the relay.
> >
> > Shane Fedeli
> > 85PT40
> > Hershey, PA
> >
> >
> > --- In WanderlodgeForum@yahoogroups.com, "Scott Forman"
<sforman@>
> > wrote:
> > >
> > > Can someone explain how to run the wires for this set up?
> > >
> > > Scott Forman
> > > 86 PT38
> > > Memphis
> > >
> > > --- In WanderlodgeForum@yahoogroups.com, "sfedeli3"
<sfedeli3@>
> > > wrote:
> > > >
> > > > Hi Curt,
> > > >
> > > > My thermostat is mounted in the ceiling of the engine
> compartment
> > > > just above the alternator on my 6V92. It is about the size
of a
> > > small
> > > > bottle cap. I used it, in conjuction with a bosch relay, to
> power a
> > > > Hayden fan that cools the engine compartment. I used the
> largest fan
> > > > that I could find at Advanced Auto parts and mounted the
fan
> behind
> > > > the grill that provides access to the curbside of the
engine
> > > compartment.
> > > > Originally, I had set my fan to expel the hot air and work
in
> > > > tandem with the large engine fan to pass air through the
> > > compartment.
> > > > Once parked, however, I have achieved better results by
drawing
> > > cool,
> > > > outside air into the engine compartment, expelling it
through
> the
> > > > radiator. I usually just reverse the wires on the fan,
causing
> it to
> > > > run backwards. This would cool the compartment so fast,
that
> the
> > > relay
> > > > would shut it off, so I also installed a SPDT switch to
> override the
> > > > thermostat and leave the fan on. I may eventually install
at
> DPDT
> > > > switch to reverse the polarity without having to pull the
wires
> off
> > > > the fan. This setup has worked fine for about 12K miles and
the
> fan
> > > > does not seem to mind running in reverse.
> > > >
> > > > Shane Fedeli
> > > > 85PT40
> > > > Hershey, PA
> > > >
> > > > --- In WanderlodgeForum@yahoogroups.com, "Curt Sprenger"
> > > > wrote:
> > > > >
> > > > > Several of us have recently posted about the ratteling or
non
> > > working
> > > > > fan that is mounted in the upper rear area of the engine
> > > compartment.
> > > > > Does anyone know the thermostat degree setting for that
fan?
> > > Anyone
> > > > > know where that thermostate is located?
> > > > >
> > > > > My thought at this time is to control the add-in Hayden
fans
> to
> > > run
> > > > > off the same controls.
> > > > > --
> > > > > Curt Sprenger
> > > > > 1987 PT38 8V92 "MacAttack Racing"
> > > > > Anaheim Hills, CA
> > > > >
> > > >
> > >
> >
>
>
>
>
>
>
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