I thought it was a SHORTER pin that gave engagement at a lower temperature.....at least that what I figured from the diagram of the reservoir system of the fan clutch. When I refilled mine with the 10,000 CST silicone, I shortened the pin to make the "tropical option" out of it. I could be wrong (heaven knows it happens often), but I was pretty careful when I did the mod.
Of course it does matter which side is "up" on the bi-metal strip, but I thought it only went in the slots one way. Maybe I put it in wrong, but again, I was careful (honest
).
I still think the thermostat is glitchy, also.