We have a 2018 Bolt that recently had the batteries swapped. When the car got home it started giving warnings about the high voltage coolant issue. I popped the hood and noticed one of the coolant tanks was empty. I called the dealership and they said it was normal it might be a bubble. The car began refusing to shift and would say "conditions not available to shift". The dealership sent a flatbed and filled the coolant. Now the car is hit or miss on codes and ability to shift. We took it back to the dealer and they say we need a new HVAC heater to the tune of $2300. The car just turned 40K miles and I think something happened when they swapped the main batteries. Any assistance or advice is appreciated.