All good ideas here that were mentioned, air is the main one and definatley water pump it it gets hotter at speed when it should be cooler. The thermostat could be bad out of the box , it happens alot.

Big ticket items you did not cover as the 500 is alot like my 400 is the reservoir and cap. Haairline cracks in an old tank will leak pressure cause boiling and a overheat state. So cap and tank are suspect. Also a awesome leak point is the washer reservoir heating coil. It will bubble and siphon winshield washer fluid and coolant back and fourth all day causing issues.

Temp sensor was mentioned but usually not an issue.

Hows your A/C charge? it controls low fan speed. How the aux fans running? check the fuse by the firewall? its just like the blower motor strip fuse.

How abbout your viscous fan clutch? When the oil leaks out of it, it should be spinning fast, if its freespinning then its not doing its job at 2000 rpm.


Lots of things but easy to check.

If you need help you can PM me and ill give you my number.