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    Can you use water instead of coolant in a radiator?

    Is it okay to use water rather than coolant in a radiator?

    Answered by CarsGuide
    22 February 2019
    Graham Smith

    It’s not a good idea to use water instead of a coolant, particularly if the cylinder head is an alloy one. Most cars today have alloy heads, and using water will cause corrosion. You’re best to use a coolant that’s designed for use in your car. An auto supermarket should be able to help you choose the one to suit your car.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.
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