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I have changed my radiator cap couple of months ago with an original OEM one. The older one had a broken sealant which caused engine over heating.

Now, i have no heating problems but after the engine cools down for 4-8 hours I notice the upper radiator hose gets flatten!

I watched a YouTube video - he was telling the symptoms of a bad radiator cap, in the middle he said "That sucked radiator hose is a good sign of a well sealed coolant circuit!"

So do I have to consider changing the hose or there is another problem to worry about?

Thank you,

Pᴀᴜʟsᴛᴇʀ2
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Aqua
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1 Answers1

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As the the coolant cools off and decreases pressure, a vacuum is created in the cooling system causing your flattened hose. The smaller check valve at the bottom of the radiator cap, (the small metal circle at the very bottom of the cap) should be 'pulled open' by this vacuum, essentially sucking in coolant from the resevoir, into the engine. Unfortunately it is not working properly.

https://www.cgj.com/2013/05/14/how-does-a-radiator-pressure-cap-work/

Since you said it was replaced recently, I would have to guess that you have some stop leak in the system, and over time, it has restricted that passage.

I advise you to have your cooling system thoroughly flushed, then replace the cap again.

Milison
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