I've got a 2016 RAV4 Hybrid that had an issue that if you ran the heater and the car was idling in EV the engine temp would drop off drastically. It would only take 30 seconds or so for it to start to drop and then another couple to get all the way down near the C from fully warmed up. However, if it sat in EV with the heater off, it remained rock solid. I took it to the dealer and they replaced the thermostat. The car still behaves in the same manner except that it is much slower to happen. It takes over 2 minutes for the temp to start dropping and another 5 minutes to drop to near the C. My question is: Is this just normal behavior that I have not noticed until now? I have had the car for over 1.5 years now, kinda seems odd that I just noticed this. I don't recall experiencing this in the Camry hybrid or Sonata hybrids I have had.