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2018 Nissan Pathfinder SL
4,282 Posts
Well you seem to have ruled out everything but the ECU.
Just because it isn't detecting an error doesn't mean its not got a bad output driver.
So as I see it your options are
1) try another ECU
2) Forget the ECU and wire up a relay using the A/c power AND a temp sensor on the radiator or hose, and i mean you can use the stock one since its good.
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