Coolant pressure high

HI:

It is normal for the cooling system to pressurize when it is at operating temp. The radiator cap is designed to release pressure at a specific point. Have you had it checked or replaced it?

Let me know.

Joe

Yes, i replaced it the same problem.

The pressure remains high also when the car is cold (at morning).

Hi:

It should release slowly as the temperature drops. Have you tried a new cap? Also, is there any chance of a bad head gasket allowing compressed air to enter the cooling system?

Here is a link that explains how to check for a head gasket issue. If you page down, it shows how to check the cooling system for evidence.

Let me know.

Joe

I tried to search if it is a head gasket issue, there is no symptoms.
I uploaded the video what is happening.
note: that this video is at very morning after a stop all night.
*I have changed most of the hoses and a side of the radiator and the cap.
Thanks for your reply

That doesn't make sense. You are certain the engine isn't building pressure via a head gasket? I ask because coolant expands when it gets hot. That is what pressurizes the system. If it exceeds a specific pressure, it is released via the cap. Now, the cap will maintain pressure below its threshold; however, under normal conditions, pressure is gone when the coolant cools and is no longer expanded. That leaves one thing. Air is getting into the system. If you remove the radiator cap when the engine is cold and start it, is there any evidence of bubbles? If you start the engine, does coolant want to come out?

I forgot to include this link in the last post.

https://www.2carpros.com/articles/head-gasket-blown-test

Thank you very much.
I will search for bubbles next morning.
In vase there is no bubbles can i use a coolant system leak repair as shown in the picture or will harm the engine?

Hi,

I never recommend using these products unless it's an emergency. Also, the problem isn't a leak but the opposite, pressure isn't releasing. Is coolant leaking at some point?

Joe

Now yes at very high pressure it is leaking from the other side of the radiator.

It sounds like the radiator should be replaced. If there is a larger leak, these things won't help. Also, that really makes no sense now. If there is a high pressure leaking from the radiator, how it is staying pressurized or is this something new?