Hi and thanks for using 2CarPros.
Honestly, if nothing was recently worked on, they couldn't have been crossed. However, what you are describing sounds more like a bad head gasket. Take a look through this link. It discusses common symptoms of a bad head gasket.
https://www.2carpros.com/articles/head-gasket-blown-test
Let me know what you find or if you have other questions.
Take care,
Joe
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Friday, February 1st, 2019 AT 8:33 PM