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My thoughts would be to unplug both Y motors from the drivers (power off!) and do a simple check of the resistance through the pairs of windings in both motors. They should all be about the same,...

One possible reason for different temperatures for the two motors on your Y axis is whether or not you have "half current when stationary" selected on both. A lot of stepper drivers have this option...

The max motor temperature is generally limited by the varnish on the winding wires, along with the other insulating tapes and sleeving used in their construction. These are generally either Class B...