Yes, you can absolutely run distilled water. If you are only running distilled water (without any antifreeze at all), you might want to add some water wetter for some additional rust protection. Water wetter will also lubricate the water pump, which is typically one of the jobs antifreeze does. If you just add a little distilled water, you don’t need to worry about this step at all.

Make sure you understand why your car overheated. Repeated overheating can cause other expensive engine damage, like a blown head gasket or warped head. Try not to let the car overheat anymore once you discover the problem.

Thanks 🙏

Distilled water is fine in the radiator. Don’t open the radiator cap or any other part of the pressurized system while the car is hot.