The coolant in an automobile radiator is kept at a

Solution 5DQ Step 1: (a).By upping our cooling system pressure to high degrees. Antifreeze only adds small degrees to our boiling point, so the main reason for running a cap is to run straight distilled water (with water wetter to prevent corrosion). Significantly reduce antifreeze without danger of boiling point over.specifically in the summer months. In particularly hot areas with engines that are running high compression or boost, a radiator cap, water wetter and a reasonable coolant ratio or distilled water setup would be a good "stock upgrade" to help prevent detonation.