are your hoses real soft? if so your lower hose could be sucking itself
also like sno man said, check the cooling fans, and go to a car wash and
make sure you get all the debris out from your condenser and radiator,
check the thermostat to make sure its opening.....a new one can be bad; a
pot of boiling water and a thermometer from the parts store works good.
had a tricky overheating problem on a late model Intrepid. After
replacing the thermostat, etc., it turned out to be a tiny, tiny leak
in the coolant reservoir which caused the system to lose pressure. If
the system can't maintain proper pressure, it overheats every time.
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