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* On defrost mode, the A/C should only come on automatically at maximum defrost (if at all), and it should always be toggled on/off by the driver. I would prefer to make A/C on the defrost setting optional, or have it use the A/C for a minute after the defroster is turned on -- and then it goes off automatically.
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I am particularly frustrated with the Prius on this: my Mom's 2007 has the GPS and the touch screen, and when you pull the A/C fuse to prevent it from coming on in defrost mode (
full heat on the defroster is absolutely required during freezing rain / ice storms!) -- the entire HVAC system is completely disabled!
This totally rots... I think you can manually shut off the A/C, but remembering to do this and the fact that the touch screen toggles over to the default screen a few seconds after you stop using it, makes this much harder than it should be.