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Watch the engine idle long enough for the coolant heat make the radiator cooling fan cycle on and off at least twice. This way you know the cooking fan circuit functions. Other test is turn your air con switch on, then the cooling fan should turn on with the air con. One more is when the overheat light comes on, turn on your air con to make the cooling fan run. Last i want to say is find the coolant temp sensor fan swith , usually on the radiator, and inspect the connection for loose, faulty, good, bad.
A fan running after switching the engine off is normal for some cars as this prevents overheating and the fan should cut off after a while. Only if it is still running long after switching the engine off is there any cause for concern.
Change the thermostat? Probably did, since you went after the computer. Does the car really over heat? Or does the gauge just go high(bad gauge). If the engine does over heat, then it could be the water pump, or to much sediment in the engine(Something blocked). I have seen both.
The coolant temperature sensor adjust the air to fuel ratio depeneding on the temperature of your engine. If it is bad it will run your engine too rich(to much gas, not enough air) and it will run rought at idle and definatly have black smoke, good-day! its worth a try ! In some cases you can unplug the sensor and the PCM will compensate by running a default air/fuel ratio and in some cases allowing the car to run without the sensor, I'd just replace it.
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