When I turn on the A/C in my Roadster 1.5, the A/C light comes on, but often the heater led also comes on by itself a little bit later, which doesn't seem right to me. I thought *maybe* the car uses a fan from the heater unit to help flow A/C air or something, but can't think of any other explanation other than it being a bug. If I press the heater button to turn it off, it turns off, but about 5 seconds later, I can feel a vibration through the pedals. The led behavior (heater led coming on sometimes when I have A/C on) has happened for awhile now (owned my roadster for ~3 years now) and the shop has never been able to tell me whether that's normal for the roadster or not, but the vibration aspect of the behavior is definitely a new behavior. I was driving home from work with A/C on and a few minutes later, heater light came on. Eventually, I turned off heater, and about 4-5 minutes later, I started feeling a vibration coming through the pedals. A few minutes later, I received a "Battery Problem Power Reduced" dialog on the touch panel with ID:600. The car is still under warranty, so I took it into Tesla. They replaced the coolant pump to fix the ID:600 fault, but that didn't solve the "heater light comes on when A/C is running" issue. They said they "cleared" the firmware (I'm sure they didn't "clear" it, thought he might have meant "updated" it, or perhaps the roadster has some PRAM-type settings that they cleared), and they thought that might have fixed it. Nine days later, I got the car back. Three days after that, I turned A/C on for first time since getting car back and the same issue is happening with the heater light coming on. This time, heater light came on almost immediately after I pressed A/C button. I turn off the heater and sure enough, started feeling the vibration. Has anyone else experienced this with their roadster / know if the led issue is normal / able to offer some suggestions on how to address the problem? Thanks in advance for any words of wisdom you may have on this subject.