Hi,
Matt, what I'm seeing appears to be steam from condensation inside the exhaust and not coolant. This vehicle isn't offered in the US, so I don't have specifics. However, the high idle could be a few different things.
For example, the engine may have developed an engine vacuum leak. Also, there could be an issue with the idle air control valve.
Find out if the check engine light is staying on while it is running. If it is, scan the computer for diagnostic trouble codes.
Here is a link showing how to scan all modules:
https://www.2carpros.com/articles/can-scan-controller-area-network-easy
Although I don't have the specifics, I will be happy to help figure things out with you. Let me know as much as you can. For now, I see nothing to think it's a head gasket issue.
Take care and let me know what I can do to help.
Joe
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Wednesday, May 24th, 2023 AT 8:10 PM