Part 3/9:

GM’s Simpler, Gravity-Driven Cooling

GM employs an elegant, low-cost approach. Their motor design uses the inherent motion of the vehicle to keep the system cool: oil is flung upwards into cast channels within the motor, then gravity aids in dispersing the oil over critical components. This method eliminates the need for pumps, complex plumbing, or external cooling hardware, reducing costs and complexity. The design has historical roots; Toyota used a similar technique on the Prius C for over a decade.