2008 Dodge Avenger running hot
did you bleed the system good?
Make sure the system has no air in it. Did you flush all the lines before you put radiator in it? Could have a blockage in one of the heater lines or even in the heater core.
Does it get hot really fast, like within the first couple of minutes run time? if so you may have blown headgaskets, it's over-pressurizing the system creating an internal air pocket and stopping the coolant flow. You can get a DIY kit from your local parts store and run the tests yourself, if it fails then it's tear down time.
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