If the overheating never occurs when driving at higher speeds, the best suspect is an electric radiator fan that is not turning on. That is not needed at highway speeds when natural air flow is sufficient.
Also, check for a radiator fan fuse that is blown. Most commonly when that happens, it is because the fan motor has tight bearings. That causes it to draw higher current than normal. The fix for that is a new fan motor or assembly, then a new fuse.
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