I've had the exact same issue is OP on my 17 Volt Premier. Occasional very bad burning smells when running the ICE and the heat. It seems to be worse when at a stop compared to cruising along. We just bought mine in April and we had a couple cold snaps here, but now that I am not using the heat I haven't had any issues. I've had no problems at all when running the AC, whether the ICE is on or not.