Hi and thanks for using 2CarPros.com.
If they are mixing, chances are you have a bad head gasket or something cracked (head or block). What I need you to do is read through the following link. It discusses how to check for a blown head gasket and other issues.
https://www.2carpros.com/articles/head-gasket-blown-test
Let me know what you find and if that link helps.
Take care,
Joe
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Tuesday, September 18th, 2018 AT 6:51 PM