I recently did a 23 hour straight drive (with charging) from Vancouver to Saskatoon. 3/4 of the drive was with temperatures well below freezing. About 7 hours into the drive, outside temperature -5 C, the cabin heater failed. Did everything possible on my own to rectify (resetting the car etc). The climate control including defrost would not blow air unless it was set to the coldest set point. Any warmer and the fan would turn off. For the rest of the trip, with temperatures as low as -15C, there was no heat.
I'm wondering if there is a flaw with the heat pump system. I don't know vehicle heat pumps, but do know commercial heat pumps for buildings. They do not operate at low temperatures and would eventually freeze up if left to run.
Has anyone else experienced a similar situation?