Cooling fan
Pulls air through the radiator when you're stopped in traffic.
Signs it's worn: Overheats in traffic but fine on the freeway.
What's wrong with my car? · Cooling
Overheats in traffic but fine on the highway?
Usually: Cooling fan not kicking in.
Fine on the highway but hot in traffic is the classic sign of a dead cooling fan.
The parts that fix it
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This is a first read from the symptom, not a diagnosis of your car. If you're not sure, have a mechanic confirm before you buy, and bring the prices you found here with you.