Question about 2001 Cadillac DeVille

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Car running hot when idle not on highway. What could be the problem?

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Replace thermostat and fluid be sure and flush radiator first and add correct fluid,there are certain types of fluid that must be used.

Posted on Mar 23, 2011

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The fan is probably not coming on or not operating properly.

Posted on Mar 23, 2011

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SOURCE: this car runs hot when idleing but is fine at

The thermostat might be stuck open. If it is then water running into the radiator is not spending enough time there to cool off before flowing back to the engine block. At speed the increased airflow is having a greater cooling effect while blowing through the radiator fins. With the car totally cool, open the radiator cap and then start the car. Watch the water flow in the radiator. If it is flowing straight through right from the start, you'll know it is the thermostat. It should sit in the radiator until the engine reaches opening temperature and then the flow begins. As soon as the cool water from the radiator reaches the thermostat, it closes and the flow stops. So constant flow equals bad thermostat, flow then stop then flow equals working properly.

Posted on Aug 08, 2009

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