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Did you figure out the problem? On my 2007 hch it does the same. When my civic overheat the top radiator hose is very hot hot the bottom hose is cold. It’s like the thermostat never open, but I tested it over boiling water it opens. It’s either air pocket behind the thermostat preventing it from the hot coolant or the water pump has fail on the inside. I’ll be taking off the water pump this next week after I receive it from rockauto.
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