Quote:
Originally Posted by JSH
Some updates on life with a 2017 Bolt.
GM's HVAC design engineer need to be fired:
The Bolt's HVAC is even stupider than I thought. I had the OBD scanner hooked up to record some DC charge curves so I decided to monitor what the AC does on my way home from work. With the A/C set to more than 70F the car RUNS THE HEATER to get that magical auto temp instead of just dialing back on the AC compressor speed to reduce cooling or cycle the A/C on and off as required. No doubt that works fine with an ICE vehicle where the heat is a waste product but running the electric heater in an EV at the same time as the A/C is just plain stupid
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Curious how certain you are that it was the cabin heaters coming on, as I have not heard this mentioned before, and that's kind of a big deal.
I know the battery heater is likely to turn on if battery temp is below about 70 degrees. Could it have been that?
The other silly thing about the Bolt is it uses resistive heating elements for hot air, but still utilizes a liquid heat exchanger (heater core). Instead of just warming the air directly and getting instant heat, they added complexity. Heater cores are the bane of HVAC, just ask Xist.