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The radiator is prone to restriction and clogging at around 60,000 miles and beyond if the vehicle is mainly city driven . My 2003 Neon overheated multiple times after driving on the highway for approximately 20-30 miles.

The cooling fans were operational and the thermostat was brand new.

I removed the radiator, inspected the core, and found it to be partially clogged with long life coolant residue. I replaced the radiator and the engine now operates in the the proper temperture range.

On ocassion the water pumps on Neons are also known to fail in a manner where there is not enough coolant flow to properly cool the engine. Usually

the heater will not generate consistent heat when this issue is present.

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Q: Why does my 2002 dodge neon over heat?
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