Protecting the electrics-

Check whether there is any risk of wetting electrical components, including an electric cooling fan. Protect such components by covering them with a plastic bag. It is vital to do this before rinsing dirt from the outside of the radiator. Use plastic bags to cover the nearby electrical components.

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How to flush an engine radiator

Over a period of years, sediment builds up in a car's cooling system even if antifreeze containi...