[Marilynfan]

OK. Pretty sure I hate this thing. What happened to turning your heat on when it is cold and the AC when it is hot. This picking a temperature thing I don't really get. If I put it on auto it seems to always throw on the AC. It is October in Canada I don't need the AC! It annoys me to see it come on. Half the time I am trying to warm the car up.

Maybe it will just take me some time to get the hang of it.

 

[ChristineK]

I think you are missing the mark and creating a problem.

I am not an expert in this area so I am sure the experts will flame me.

OK first you are leaving the AC on, that is from what I understand a big NO NO!

Always turn the system off before turning the car off. (here is where I will catch flack)
I was leaving it on in my Mustang and the AC failed and the dealer mechanic explained in length the problem with doing this.

Second if you are setting the AC on and the temp is lower outside than you want the heater is kicking in.

I see this unit working like this and it is how I have used it: You get in, decide the temp you want (hot or cold) and set, and it just works to keep it. You would do this with each trip. If you want it 77 you pick that and if to cold it will blow heat to make 77, but if you add the AC button it will add heat when necessary or AC when to hot.

OK you gear heads correct me where I fell short.

 

[Marilynfan]

I haven't been turning it off so I'll have to try and remember to do that.

I don't leave the AC on. I am constantly pressing the button so the light goes out on it. It just seems to come on all the time by itself. For example today it is like 8 C outside and I get in and turn it to 22 C and the AC comes on! I just find it a pain to try to figure out what temp I need to turn it to to get heat instead of the air coming on. If you leave it in manual instead of auto does the temp setting really do anything or is it used simply to determine if hot or cold air will come out?

The front "defog" thing is different too. I take it you can't throw heat on your front and back windsheild? When you press these buttons the AC comes on. How do I "defrost" my windows in the winter. That used to always save me some scrapping by turning on the front and back.

 

[none]

I take it you can't throw heat on your front and back windsheild? When you press these buttons the AC comes on. How do I "defrost" my windows in the winter. That used to always save me some scrapping by turning on the front and back.

Most cars turn the air conditioner on when in "defrost" mode to dry out the air hitting the windshield. Believe it or not, this helps to clear the glass faster!

However, I have no explanation as to why the air conditioning comes on automatically when we want to heat the cabin. I guess they figured that a dry cabin will reduce fogging of the windows? No idea...

 

[fotomoto]

I know the a/c will come on if the interior humidity is too high. Defog settings will definitely kick in the a/c on any system since using warm moist air would only make things worse.

Still summer here (heat index of 106f today) but we have had one cool front. I had mine set to 68f and a cool 60f morning (yeah, I know) had the a/c light on but the fan not running. Once the engine temp came up, the floor vents came on (2 bars on fan speed) with heat. A little bit later, I notice that both the dash vent and floor symbols were indicated on the dial and fan speed was at 1 bar.

I think just because the a/c light is on doesn't necessarily mean it is operating. I'd suggest on the next cold start popping the hood and watching the compressor if it can be seen.

 

[none]

The system senses humidity?

 

[ChristineK]

The system senses humidity?

It does, there is a temp and hygrometer in the car