If you wash it when the engine is hot, you run the risk of damaging your engine as cold water may cause hot or warm parts to shatter or be damaged. [substeps] The best time to wash under the hood is in the morning after your engine has cooled all night.
[header] How to wash under the hood of a car [title] Make sure the engine is cold. [step] The only time you should wash under the hood is when the engine is cold. This means that you need to wait a substantial time after running the engine and washing under the hood.