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Sounds like the radiator fan isn't coming on. You don't need the fan on when you're moving, cause air is blowing into the radiator, but sitting still you need the fan or it'll overheat. This makes me think the fan isn't coming on.
The fan is controlled by a relay that could be bad, and the relay is controlled by the climate control unit, which could also be bad. Pull the fan relay and see if it the primary is getting voltage, with a test light, when the AC is turned on.
Check if your fuse is blown! If not have the wires tested that run into your fan if there ok and show power then your fan needs replaced! Please give me a thumbs up if this helped! Thanks
Check the fan itself for free turning--if it grinds or is hard to turn, replace the fan motor. The engine heat sensor reports temperature to the computer which turns on the relay and it turns on the fan motor. If you have A/C, turn it on--that should force the fan on all the time the car is running. If that works, then replace the sensor. If you don't have A/C, take a chance on the sensor--it's not too expensive. Wrap the threads with several turns of teflon tape when installing and don't over-tighten.
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