On my '73 TR6, I use a Porsche 944 thermo fan switch
that I purchased from Performance Products. Its their
Hi-Performance switch, which turns on at a lower
temperature than the regular 944 switch. I used the
metal "T" fitting in the top radiator hose which
formerly housed the distributor thermo switch ('72 to
'74 TR6s). All I had to do was rethread the "T" to a
metric thread. Works great.
Hope this helps,
Hugh Barber
Hollister, CA
'73 TR6
On Thu, 23 May 2002, Peter Zaborski wrote
>
> > From: Timothy Holbrook [mailto:tjh173@yahoo.com]
> > Sent: Thursday, May 23, 2002 8:35 AM
> >
> > I have an electric fan on my car, and currently I
> > have an on/off switch in the car to manually
activate
> > it. I am interested in installing an automatic
> > thermostatic switch in the radiator...
>
> Tim,
>
> I have this set up on my car. The switch I'm using is
from a first
> generation Honda Prelude. These a re common in junk
yards where I live so
> getting the fitting was not a problem - it's a metric
thread that was hard
> to locate locally. I believe this switch turns on at
a lower temp compared
> to the typical switches most modern cars use since
they are designed to run
> hotter than older cars.
>
> A few points to consider:
>
> - The bottom of the radiator has cooler fluid than
the top so ideally it's
> probably best to install the switch in the top tank
(but that looks uglier).
> FWIW, mine is in the bottom tank.
>
> - The switch mounted in the return pipe *might*
affect coolant flow since
> it's in a much smaller channel than if it's in the
tank. I don't know for
> sure and probably I'm being overly paranoid but just
thought I'd throw that
> out. Probably the folks who sell this kit have this
all figured out...
>
> - If you install the thermo switch, keep the manual
switch as well in case
> you ever want to turn on the fan before the thermo
switch closes. The Dan
> Masters book has a pretty good write up of this
including a wiring diagram.
>
> - While you have the rad out to install the switch
port, add a drain tap so
> changing coolant will no longer require disconnecting
the bottom hose. This
> won't add much to the total cost of the work.
>
> Good luck.
>
> Peter Zaborski -- CF58310 UO
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