Overheats at idling

Welcome to 2CarPros.

Once the temperature gets to a certain point, regardless of how fast it gets there, the fans should turn on. Have you checked fuses and relays? Have you checked to see of the fans have a ground? Since this only happens when the vehicle is in stop and go traffic, there is a really good chance it is related to the cooling fans in some way.

I attached a picture of the fan's wiring schematic. I highlighted the things I need checked first. Here are a few links you may find helpful:

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

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

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

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I attached picture 2 also, because it shows the relay in question. Please understand, a bad cooling fan motor can be the cause also. To check that, you would need to run power direct to the fan motor.

Let me know if this helps you or if you have other questions.

Take care,
Joe