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Hello and welcome to just answer. I am not sure about that because the engine cooling system was designed to be pressurized system. What have you tried so far to stop the overheating?
There is a chemical block test kit that you can get from your auto parts store, It is part number BK.(###) ###-#### ***** uses a blue liquid that changes from blue to yellow/green is it detects HC in the resevoir bottle. See if you can rent a test kit from the auto parts store and do that test. If anything we can at least rule that out.
So then it is a fan problem. have you tried a new temp switch and/or relay? If not, then I think we need to try that next.
Sounds good. let me know how it goes,
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