A/C Mode Keeps Changing By Itself.....help!

This is why we recommend using "auto". Otherwise it will drive you crazy arguing with it.

 

I don't have that problem when I tell it to do face/feet or face only. I'd take it back to the dealer and have them fix/take a look at it.

 

If by "on its own" you mean when you open and close your vents, then yeah it's normal. That's the only time it changes for me.

 

Could the temperature have been set at a point that would have caused this? Mine will do that if I set the temp. to about what outside air temp. is. The inside gets cool enough quickly and then it thinks it needs to warm the inside air and it cycles like that.

 

If its not set to auto then the settings "should" stay where u put them at. If they are changing, take it back to the service department. Why mess with it when its still covered under warranty.

 

I vaguely remember setting changing by themselves when the car was new. I don't see it now. Not sure what was different then. Try different settings and report back.

 

That's the nice thing about owning a Prius.... you never stop learning what it will do. And I mean that in a good way!

 

Ahh...you were probably hitting the cabin filter button...=)

 

Yes, that was it. I forgot the details as it was 2 years ago. Since that I learned not to use it. I prefer manual mode and fresh air. It's annoying enough to have to switch to fresh air every time AC button is pressed.