Marty,
Since you have an adjustable T-stat, you have flexibility in probe placement.
I have mine inserted about 6-inches below the bottom of the upper radiator tank
on the right (passengers) side. I did not use zip ties to mount the probe to
the radiator face (the kit came with an adhesive foam rubber patch instead).
Along with tweaking the T-stat setpoint, my fan kicks in just as the temp
needle in the cockpit approaches mid-scale and kicks off after a slight
overshoot past mid scale. The fan rarely, if ever, comes on at speed (my
ammeter is my ON/OFF gauge). However, this discussion appeared here before and
I believe the consensus was to insert the temp sensor in the bottom of the
radiator. A popular move I recall was to install a NPT-threaded temp sensor
directly in boss soldered in the lower radiator tank. All I can tell you is my
setup has worked flawlessly for three driving seasons so far and required
minimal effort to install.
My T-stat/relay is mounted to the upper right radiator support brace above the
charcoal canister and Ive run all the power/control cabling under the right
wing flange straight to the battery. The relay override wire then continues
behind the battery tray into the cockpit where I have a SPST ground switch
mounted above my left knee. This offers a relatively unobtrusive install
without challenging the Lucas fusebox with a high-current draw. I also have
a 60-amp Bosch alternator.
Rick O.
72 TR6
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