Some Toyota Prius owners report experiencing issues related to the inverter coolant, particularly when the engine light indicates a problem. These issues may include low coolant levels, leaks, or malfunctions within the cooling system, which are critical for maintaining the optimal temperature of the hybrid system. If ignored, these problems can lead to overheating of hybrid components, resulting in reduced performance, increased emissions, and potential damage to the inverter. Owners are advised to check coolant levels, inspect for leaks, and seek professional assistance if they cannot resolve the issue themselves. Regular maintenance and prompt attention to warning lights can help prevent further damage and costly repairs.

The 1993-2002 Toyota Supra and Toyota Supra Turbo radiator may crack near the radiator cap. When it cracks, the engine will begin to run warmer than normal, and eventually will overheat. Overheating will also be accompanied by a sweet smell around the front of the vehicle, most noticeable under the hood. Replacement of the radiator is the only solution, as the crack occurs on plastic.