Yes, as Cab Driver mentioned the motor generator units are cooled through pressure fed ATF that routes through various cooling channels within the transaxle (including the motors) and then routed out to a heat exchanger built into a portion of one of the radiators. Interstingly the trans fluid pressure comes from a 3-phase high voltage AC motor driven directly from a 3rd inverter channel (the other 2 for MGU A/B of courseDo the motors have a cooling system as well?
While seemingly somewhat more efficient, there isnt a lot of cross-feeding of the various heating/cooling loops. Balancing the mesh of actual heating values and dissipation isnt an easy task. So yes there may be various cooling circuits that are "getting warm" or even HOT that one might think could be utilized for additional cabin heat, but generally they are not implemented for a myriad of reasons.Wouldn't the output of that (and possibly the battery cooling loop) be fed into the CHCM as a heat source when cabin heating is needed? If you're drawing a fair amount of power in CD mode, they'll get warm...