It sounds like you might have a faulty radiator fan/clutch. As you mentioned that engine only overheats when you are at a stop. Which means the fan is not blowing air thru the radiator when you are at stand still, and the temperature rises, but as you start to drive air flow thru the radiator and cools the engine to the normal temperature.
When you have a faulty clutch the fan will not engage properly and lead to a engine overheating.
You can diagnose a faulty clutch.
Start the engine and wait till it reaches normal operating temperature.
Stop engine and using a glove or a cloth to protect the hand, immediately check the effort required to turn the fan. If it requires considerable effort, the coupling is good.
But if you can move it very easily, it indicates the coupling not working properly.
I have attached diagrams for your reference.
Please let me know of any questions.
Images (Click to enlarge)
Monday, August 23rd, 2021 AT 11:49 AM