Hi,
This can be the result of a few things. Most commonly, it is due to a partially plugged cooling system due to corrosion. With that, I would start by flushing and refilling the cooling system.
Here is a link that explains the flush and refill procedure:
https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars
If the system is clean already, the next thing to check is if there is an issue with a bad head gasket. If you look at the link below, it describes what to check for when suspecting a bad cylinder head gasket.
https://www.2carpros.com/articles/head-gasket-blown-test
Let me know if this helps or if you have other questions.
Take care,
Joe
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Sunday, September 5th, 2021 AT 10:03 PM