So Tesla is going to send me a new Mobile Connector to see if that fixes things, and a Ranger will come by on the 24th.
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For reference, this fan is in the lower left front of the car, and it is apparently the *auxilliary* fan for the cooling system. It doesn't turn on until the cooling system is at a very high notch. The squeal, of course, is only present after the cooling system then turns *off*. I and the service tech ended up reproducing the issue by running the A/C on LO with the doors open until the compressor went up to the top notch, and then closing the door and turning the car off.
Patient: Hey Doc, it hurts when I do this....
Doctor: Don't do that then....
;-)
This seems odd. I haven't seen a modern car with a belt driven fan, and I can't imagine purposely building an unbalanced fan to make a better noise in a noisy ICE. Who came up with this theory?One of the fans used in the cooling system is, well, I don't know the standard term, but it is asymmetrical or unbalanced. Now, normally you never make fans unbalanced, because they scratch the sides of their casing, squeal, and eventually self-destruct. However, apparently it is traditional to use these unbalanced fans in gasoline cars to make a more harmonious noise along with the engine noise (something completely irrelevant to the Model S). The problem of preventing the fans from self-destructing has mostly been solved in the gasoline cars, but it depends on the fan being belt-driven in order to stop the fan from freewheeling at low speeds.
Ok, but it squeaks. Doubt that's intentional!I find it difficult to believe that Tesla would design a fan that was unbalanced and that would wobble inside of its housing, rubbing the sides. This is something that would be impossible not to know during the design and testing process. Perhaps the tech is confused about the purpose behind designing asymmetric fan blades. Apple uses asymmetric fan blades on its latest generation laptops so as to cause an intentional and random variability in the noise the fan produces. This reduces the perception of fan noise because the noise is constantly varying between different frequencies, reducing our ability to "tune in" to the noise. An asymmetric fan blade design does not mean that the fan is unbalanced and will wobble, it simply means that the fan blades are not all of uniform shape and direction.
I seem to have some nasty corrosion on the support that goes across the front of the Frunk. The damage was obviously caused by salt over the winter. People in northern climes might want to check for this.
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That looks seriously bad! Where else might there be corrosion of that degree going on that we can't see or haven't found yet... Surprised there's unpainted metal there, that seems like a risk factor for corrosion.
I seem to have some nasty corrosion on the support that goes across the front of the Frunk. The damage was obviously caused by salt over the winter. People in northern climes might want to check for this.
I seem to have some nasty corrosion on the support that goes across the front of the Frunk. The damage was obviously caused by salt over the winter. People in northern climes might want to check for this.