Toyota Highlander burning coolant smell with frequent reservoir refills required on Toyota Highlander

Some Toyota Highlander owners report experiencing a burning coolant smell accompanied by the need for frequent reservoir refills. This burning odor may be attributed to burning electrolytes and gas, particularly if the vehicle is not operated properly. Additionally, some owners have noted that even in the absence of visible leaks, the smell of antifreeze could indicate underlying issues, necessitating a thorough inspection of the coolant system for leaks. Reports from dealerships regarding newer models like the 2024 Toyota Grand Highlander suggest that busted or cracked hoses may contribute to coolant leaks and frequent refills. Regular maintenance checks, including the inspection of the thermostat, radiator cap, and coolant reservoir, are crucial for identifying problems that could lead to these symptoms. While some owners have attempted to mask the odor using vinegar and essential oils, it is recommended to consult a qualified mechanic to properly diagnose and address the root cause of these issues to prevent further damage or safety risks.