This is a frequently asked question, yes you can top up with just water, but you should only do this in an emergency to enable you to get to a garage. Engine coolant contains antifreeze, so diluting with water will lower the boiling point and the coolant will stop to work efficiently.Feb 15, 2021
There is no problem with just topping up the coolant. You can add the coolant without flushing out the old. However, with time, the older coolant becomes acidic. This can cause corrosion, and afterward, can cause defects in the cooling system.Oct 15, 2020
Only One Coolant is Right For Toyota Prius They are a standard gasoline engine and a high voltage system. The High Voltage or HV system requires complete isolation from the other systems. This means that everything about it is special and must be treated as such. The cooling system is no exception.Jul 22, 2019
Prestone – Asian Vehicles (Red) 50/50 Antifreeze / Coolant – Gallon (Part No. AF6200) Prestone Asian Vehicles (Red) antifreeze+coolant – ready to use (50/50 Prediluted) is our best formula for all Toyota, Lexus and Scion vehicles; makes, models, years & fluid colors.