According the the laws here in the US they shouldn't be able to void it if the tuner didn't cause the problem. However if they suspect one and see that the tuning parimiters have been changed they can do just about anything that they want to and it is up to you to fight them. And like all big companies their pockets are a lot deeper than ours if it goes to court.
On the temperature and the fans running even when it is cold out, you need a actual temperature gauge to tell you just how hot your machine is getting. On my aftermarket gauge set up it has a actual temperature gauge with the sensor installed in the radiator hose. I have found that even when running in cold temperatures that the max temperature that I have seen in 206 F when the thermostat opens and then it will stay between 194 F and 206 F.
I never have watched to see just when the fans kick on.
2016 Kodiak 700 base model with a few SE parts CV boot guards, receiver hitch, Grizzly bars. Trail Tech Striker speedometer/voltmeter. 501 Parts Electric Grabber locking diff
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