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Tesla has given up on liquid cooling the rotor on LDUs, after trying 1-lip seals, 3-lip seals, and multiple rotor resurfacing methods. https://teslamotorsclub.com/tmc/posts/7898613/ Unlike pretty much every other water pump seal design in the world, Tesla did not design in a weep hole. All...

OK, with a sample size of TWO, those pinion brgs go bad, can be replaced, and the noise is gone. With a sample size of THOUSANDS, the original, steel ball bearings erode from induced rotor current and cause milling noise, which was ameliorated by Tesla updating the rotor bearings to ceramic...

If the sound is hissing and high-pitched, and the pitch can be modulated by the accelerator pedal, it may be a different common problem with the early Tesla Model S which our cars share: "Battery Contactor Squeal", Tesla Tech Note TN-13-16-002 R1, 13 Sep2013...

Only the very early DUs used those bearings; all remans after a certain year (and all new DUs) used similar bearings but with ceramic balls in the bearings, non-conductive. The original Aegis ring in our DUs, designed to route to ground stray induced current in the rotor, turned out to be...

Consider having a "coolant delete" manifold installed, or having yours suitably modified so that the motor's rotor is no longer cooled by a glycol/water mixture. Tesla has (had?) apparently given up resealing the Model S version of this drive unit, and was for a time supplying reman drive units...

Indeed. The rotor coolant seal is shared on the Model S, RAV4 EV, and your B250e/Electric Drive, and they fail at an alarming rate. There are a lot of PO'd early Model S owners, your pain is shared. Only the early Model S (and our variants) use the water-cooled rotor design; none of Tesla's...

A bit of additional info: the drive unit is not the same as Model S, it merely has a lot of interchangeable parts. In the B250e and RAV4 EV, it's mounted reversed, the gears have their angle reversed, the oil pump is reversed, the case halves are different (to accommodate electric Park), and...