So my heater finally got fixed. After waiting forever for the part, my car came up with a warning that 'Car may not restart; schedule service'. Tesla responded that it was due to the PTC heater faulting, and that if affects the high voltage loop. Sure enough, next morning, car won't go into gear, lots of messages coming up about electrical system shutting down. Schedule a tow for the Monday. Next day, go to empty out my car and it's completely dead. App won't connect, doors are locked, key card doesn't work. Go buy a 12V from Cdn Tire ($150) and pop the frunk using the cables in the tow port, replace the battery and can open the car & empty out. Install the tow hook in the frunk before locking up again. Sure enough, the next morning, the new 12V is completely dead. Tow it Tesla ($400), and two weeks later get a message it's fixed. Text (because there's no one to call) to ask if the 12V from Cdn Tire is OK and they say it looks fine. Go to pick up the next morning, and there's a 'Schedule service to replace low voltage battery' message on the screen. Go back in to 'service' where I'm told they are too busy to fix and I should take the battery back to Cdn Tire and replace under warranty. So apparently I'm replacing the 12V again this weekend, myself Unbelievably disappointed in Tesla service. Because nothing was under warranty, I'm stuck without a car without any idea when the part may come in. Had the part come in earlier (in the months that I've had no heat), I could have saved myself over $500 in tow/battery, and having to borrow cars for two weeks when the car became inoperable. So if you're heater goes, get on the list for a new one, because you may think you just have no heat, but eventually your car will die. I did look for an aftermarket/used part and couldn't find one.