hi scoty am having issues with my nissan note e11, I washed the engine last Thursday and yesterday Saturday it started, jerking but I thought it was not much of a problem but I realized the overheating sign came on and I pulled over and called my mechanic and he asked me to run some test and see if my radiator fan is working I did as he said then he said it fine so, he asked me to drive at a low speed and turn on the AC to get closer to him for full examination, the overheating symbol never came up, it was a bit late so he said he will work on it today, as he had but now the jerking has stop and the engine runs fine but the radiator fan turns on and never stop and today the overheating symbol came on and I had to pull over again. I have called him and he says he has to run a test on the car but am asking what will be the possible cause of that overheating symbol comes on a short while and off and the radiator fan finds it hard to stop or cut off when the engine becomes hot.