Ok, so driving my roadster to work on Friday, parked the car and 8 hours later start the drive home. The car was hot, no shade in the parking lot and we dont have chargers at work, so I assume the battery was pretty hot. It was mid 90's *F and the car temp measured over 100*F . While driving home I hear a clunk in the passenger compartment (really loud) and notice the a/c gets really uncomfortable, so assume that the battery is demanding cooling. This has happened several times since I've had the car and was never bothered by it assuming it was doing its thing. So I get curious and go into the service menus and check out the HVAC diagnostics and notice that the battery is 40*C and demanding cooling but I never see the battery max T go down. Also notice the coolant temp never goes down either. So it appears the system runs for a set time (maybe 1-2 minutes) then clunk, I hear the same sound, and notice the cabin air is now cooling, but the battery temp never went down. I am very concerned that my battery isn't getting any cooling while driving. So when I get home I go and do a range charge in an attempt to force cooling. By this time battery temp is around 36-37*C and this time the coolant temp goes down, and I see the battery temp go down. However, as always, this cooling demand only lasts for 1-2 minutes, then shuts off, and cooling stays off until the coolant temp matches the battery temp, then maybe 3 mins later the system will cycle on again. Is this normal behavior? Why would battery cooling while driving not respond in a similar manner to a cool down while charging? I've never seen battery temps less than upper 30*C's while driving. While driving I don't see coolant temp drop when it is demanded while driving. At this point I don't want to drive the car until I am confident I'm not killing the battery, it's been hot in NC and I am already seeing my CAC and ideal miles drop just in the past month+ I've owned the car. A few questions.... 1. Is there a detailed system operation guide, schematic, or description out there that could be shared, I want to understand the cooling system mechanical and software design so I am not in the dark on what should vs is going on with the car, especially in the terribly hot summer months. 2. What are the battery cooling demand set point while driving. When should ESS cooling kick in? What is the programmed logic for time in this mode, is it based on delta T or simply a timing algorithm? 3. Why would the system not appear to work while driving, but seem to work while charging? 4. I have never seen pump demand go to zero. It appears my coolant pump is running 24/7? Shurely this isn't normal? Sorry for the wordy post, but I am getting a bad feeling that this might have been going on for awhile at the expense of battery health. Any recommendations to further asses the issue and troubleshoot it would be appreciated.