Will your car overheat at high speeds if your radiator is going out?

Yes, if your radiator is going out, your car is more likely to overheat even at high speeds. The radiator is crucial for dissipating heat from the engine, and if it's not functioning properly, it can't effectively cool the engine. This can lead to an increase in engine temperature, resulting in overheating, which can cause severe engine damage if not addressed promptly. Regular maintenance and monitoring of the cooling system are essential to prevent such issues.