Hey guy ! My 850 coolant fan just refuse switch on when the reach working temp. on 1995 Volvo 850

I have check fuse (good) ,Swap out the fan relay with another (No change).Q? can it be a defective ECT sensor.Can this cause the fan not to switch ?

Asked by for the 1995 Volvo 850
2 answers
You will need to diagnose this properly by checking to see if you are getting power to the fan when the engine is warmed up. I do not suggest replacing any more parts until you do this. You can do this with a test light or a voltmeter.
If you are not familiar with how to perform an electrical diagnosis of a circuit, then I suggest taking it to a shop.
SEEK DAIG AND EST AS TO SAVE TIME AND MONEY. IT COULD BE FAN ,CIRUIT OR OTHER ISSUES