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You might look at hacking a temperature reading from the inverter coolant loop. The first little radiator in front of the vehicle radiator is the inverter coolant loop.
What I'd noticed is the outside air temperature would show 80-90F on a freezing day with a full block. This suggested the air flow had changed and was moving or collecting forward and causing the temperature error.
Invert cooling is pretty important so a little care may be in order. <wink>
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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