The Auto mode does exactly how you described. There is one other option when you have Auto enabled and that is you can press the A/C button and the Auto system will maintain temperature using the fans speed and heater if needed without using the A/C compressor. Keep in mind though, that the A/C systems are unlike the old systems where they cause a load on the engine or in the hybrid system, the electrical system. The pressures that the pump sees varies dependent upon the ambient temperature. Basically, when it cool out side, the pressure the pump is creating is very low and when it's hot out, then the pressure of the coolant increases. So, bottom line, just press the Auto button and don't be too concerned about MPG. If you don't use the compressor much, the seals inside and deteriorate and then you're replacing the pump due to lack of use.
I've had A/C on for 13 years on my gen 3 and I haven't had any compressor issues so far. I cross my fingers. 😂 Keep in mind that the A/C compressor also helps regulate moisture in the cabin air, which prevents health issues, fogging, and a bunch of other problems.
There is an option in the menu settings where you can have the AC not turn on in the Auto mode
Understood, but I would rather be able to just press the Auto button and have the A/C turn on and have the option to manually turn off the A/C via its button.
So this raises a good question, with auto mode on,
In my 2 previous Prius. I set the Temp at 20c and just left it year round. Left the A/C on all the time. Occasionally i had to switch it up for defog, but typically i always left it on Auto set at 20c. I only ever changed the Temp in the winter time if it got real cold out. Otherwise i just left it at 20c on Auto. I'm assuming the Rav4 is very similar to the Prius when it comes down to hvac. Powered by the traction battery.
