First time poster here. I live in the Twin Cities with my '14 Energi and noticed this winter that when I would engage the heat, either in electric mode or ICE, it would produce warm air for 5 minutes or so and then go cold. Even engaging the A/C wouldn't produce warm air. I checked the coolant and found the the reservoir to be loose and tilted, but from other postings I'm not sure that would be an issue. Luckily, the seat heater with a jacket was tolerable most days. I really like this car and average around 53.0 mpg while each week making at least 1 100+ mile trip.