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How Does the Radiator Expansion Tank Cap Work?

Model: (Various brands) Various
Part: Radiator

Video tutorial

This short but informative video describes the function of the radiator expansion tank cap. If you think it is just a simple cap that closes a tank, you are mistaken! This is because there is a pressure value in bar above the cap that indicates the maximum pressure the cap can withstand.

In reality, the radiator expansion tank works somewhat like a pressure cooker, so the cap is like the lid of a pressure cooker.

It must maintain the correct pressure in the system to ensure the proper functioning of the radiator.


Updated on 16 April 2026 by ScegliAuto


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Watch the video!


by ScegliAuto

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