At idle starts to overheat?

Hi,

Since this happens at idle, I suspect you are driving in town, stop-and-go traffic. Is that correct?

If it is, then check to see if the cooling fan turns on when the engine begins to get hot. It should turn on at approximately 215 degrees F.

When you are moving, air flows through the radiator without the fan. When stopped, the fan is needed to produce airflow. If it doesn't turn on, the engine can overheat.

I attached the wiring schematic for the radiator cooling fan circuit below. If they don't come on, check the fuses to make sure they are good and have power to and from them.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know.

Joe

See pics below. Note: I had to cut the schematic in half to make it readable. I did overlap the two so you can follow from one to the next.

Hi,

If the fans are working, then it could be the sensor, but I feel it's unlikely. The only thing you could do is to use an infrared thermometer and check the rad temp to see if it is close to what the gauge says.

Also, it could even be a failing head gasket. Do me a favor. Take a look through this link and let me know if you see any of the trouble indicators:

https://www.2carpros.com/articles/recognizing-the-symptoms-understanding-a-blown-head-gasket-in-your-vehicle

Let me know.

Joe

Hi,

If you hear the fans turn on, chances are they are working properly. Also, a head gasket may or may not cause it to overheat at all times.

Let me know what I can do to help.

Joe