i know that not good to run without thermostat..that why when that pomen said better to run without it make me wonder is this pomen know what he said or not..pomen from a well known campro workshop..i also suspect that water temp sensor making this problem bro extremeleo..thermostat already change 3 unit from diffrent brand alr but all same working temp..could not find low temp thermostat for now..thanx for the advice bro extremeleo..dont run it witout a thermostat, the fan not switching off right after the engine has stopped operating is normal, most contis are like this iirc. if its not turning off langsung, then there wud be a problem. iam suspecting a faulty temperature sensor, or a faulty thermostat. for ur case, get a new thermostat
thanx bro izso..i dont think reset can solve this..bcos remove thermostat the rad fan working normal..but it no harm trying it also..will inform my friend to try this..will update the result later..slipar, has your friend tried a complete ECU reset? Ie- take out the battery terminals and leave overnight and then plug it in the next day?