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The first-generation Kia Rio (referred to as the "DC") was offered in both four-door sedan and five-door station wagon body styles.

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Why is my kia rio 2005 overheating

My 2005 kia rio is overheating but not all the time. I replaced thermostat due to it being missing and replaced top and bottom hoses and radiator. There are no coolant leaks. Fan cuts in just below half way on temperature guage on high the after driving temperature stays normal then fans comes on at low speed and temperature keeps going up, any ideas it is driving me crazy?…?

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Try looking t see if its the water pump. My Kia Rio had the EXACT same problem and I found it to be my water pump...


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Hi @imnuts ,

Is the engine actually overheating or is the temperature gauge just showing that it is getting too hot i.e. faulty temp sensor perhaps?

Here’s the 2001-2005 Kia Rio Service Repair Manual + Wiring Diagrams.

In the Engine Cooling > Electric Cooling Fans section it shows how to test the fan and the temperature sensor.

Also wondering if there may be a problem with the water pump, (impeller blades worn, broken?) When normal driving the airflow through the radiator may help in cooling the coolant but when idling or low speed there is no or little airflow through the radiator so the fan turns on but maybe if the coolant isn’t being pumped through quick enough the coolant is hotter and the temp guage goes up. Just a thought.

In the Engines 1.5L 4- Cylinder section on p.22 of 59 ( no actual page numbering in the manual so have to use the pdf page number) it shows how to remove the water pump so that it can be checked etc.

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