More than likely there is air in the system or something more serious like a head gasket issue.
So we need to start with using a temperature laser meter to find out if the engine is actually getting hot.
https://www.2carpros.com/articles/how-to-use-an-infrared-temperature-meter
The next thing to do is pressure test the system to find out if it will hold pressure. Here is a guide that will help with this. If it does not then we need to find where that pressure is going.
https://www.2carpros.com/articles/radiator-pressure-test
Here is a general guide that will help with overheating as it will help us with next steps.
https://www.2carpros.com/articles/symptoms-of-an-overheating-engine
Lastly, we need to find out if this is a head gasket issue by following this guide as well.
https://www.2carpros.com/articles/head-gasket-blown-test
Once we know where this takes us we will have a better idea what the issue is. However, just in general, air pockets, sensor issues, or head gasket issues are the most common issues that cause this.
Thanks
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Wednesday, August 18th, 2021 AT 7:13 PM