What is the A/C switch for?

[zijlstra]

This might be stupid, but what exactly is the function of the A/C switch in the Prius (I have an '07)? When I set the automatic climate control the 'Auto' switch on the right of the screen lights up and so does the A/C switch on the left, even if I turn the heat up to raise the temperature int he vehicle.

So what exactly does the switch on the left control and how does it differ if I manually turn it off?

[dipper]

<div class='quotetop'>QUOTE(alaskaprius @ Apr 5 2007, 05:18 PM) [snapback]418526[/snapback]</div>

This might be stupid, but what exactly is the function of the A/C switch in the Prius (I have an '07)? When I set the automatic climate control the 'Auto' switch on the right of the screen lights up and so does the A/C switch on the left, even if I turn the heat up to raise the temperature int he vehicle.

So what exactly does the switch on the left control and how does it differ if I manually turn it off?
[/b]

That is how all automatic climate control works in Toyota/Lexus.

Auto A/C means the car will automatically switch between A/C or heater (fan strength and vent locations too) based on your temperature setting.

[Marlin]

<div class='quotetop'>QUOTE(alaskaprius @ Apr 5 2007, 08:18 PM) [snapback]418526[/snapback]</div>

This might be stupid, but what exactly is the function of the A/C switch in the Prius (I have an '07)? When I set the automatic climate control the 'Auto' switch on the right of the screen lights up and so does the A/C switch on the left, even if I turn the heat up to raise the temperature int he vehicle.

So what exactly does the switch on the left control and how does it differ if I manually turn it off?
[/b]

On the Prius, A/C generally refers to both heating and cooling, so the "Auto A/C" on the dash board means it will heat or cool the cabin as necessary.

However, the "A/C" button that's on the MFD enables/disables use of the compressor. So, if you have the "Auto" button on, but not the "A/C" button, it will still attempt to maintain the desired temperature of the car, but won't use the compressor to cool the car; only heat and outside air.

It is a bit inconsistent.

[zijlstra]

<div class='quotetop'>QUOTE(Marlin @ Apr 5 2007, 07:36 PM) [snapback]418538[/snapback]</div>

On the Prius, A/C generally refers to both heating and cooling, so the "Auto A/C" on the dash board means it will heat or cool the cabin as necessary.

However, the "A/C" button that's on the MFD enables/disables use of the compressor. So, if you have the "Auto" button on, but not the "A/C" button, it will still attempt to maintain the desired temperature of the car, but won't use the compressor to cool the car; only heat and outside air.

It is a bit inconsistent.
[/b]

So, does it make any sense to manually turn the A/C switch off when you are heating the vehicle? Or is it better to have the compressor running (at least somewhat) even while heating. I know that with a 'regular' vehicle you are supposed to turn the A/C on for a short time every so often even in the winter.

[adam1991]

<div class='quotetop'>QUOTE(alaskaprius @ Apr 5 2007, 09:06 PM) [snapback]418554[/snapback]</div>

So, does it make any sense to manually turn the A/C switch off when you are heating the vehicle? Or is it better to have the compressor running (at least somewhat) even while heating. I know that with a 'regular' vehicle you are supposed to turn the A/C on for a short time every so often even in the winter.
[/b]

Set the AC to auto, set the temperature to 72, and leave it alone. It knows what to do and when.

[ari14850]

<div class='quotetop'>QUOTE(adam1991 @ Apr 5 2007, 08:16 PM) [snapback]418555[/snapback]</div>

Set the AC to auto, set the temperature to 72, and leave it alone. It knows what to do and when.
[/b]

I am confused. I have a 07, and there is no "a/c" button on the dash. There is a "auto" button on the MFD, and a "ac" on the steering wheel, but none I know of on the dash. Can someone clarify?

[daniel]

<div class='quotetop'>QUOTE(ari14850 @ Apr 5 2007, 07:09 PM) [snapback]418567[/snapback]</div>

I am confused. I have a 07, and there is no "a/c" button on the dash. There is a "auto" button on the MFD, and a "ac" on the steering wheel, but none I know of on the dash. Can someone clarify?
[/b]

In my '04, if you press the "Climate" button on the side of the MFD, you get a screen on which there is an "A/C" button on the touch screen. This turns the (cooling) air conditioner on or off.

In "Auto" mode, you can overrule it by turning the cooling off. In manual mode, you can turn the a/c (cooling) on or off.

BTW, this is the "Other Cars" forum. You'd get more replies in the main prius forum.

[Tideland Prius]

A/C doesn't mean cold air in this context. It's for conditioned air (cold or dehumidified) so yes it can run in the winter but not to blow cold air, but to dehumidify the air.

[Marlin]

<div class='quotetop'>QUOTE(ari14850 @ Apr 5 2007, 10:09 PM) [snapback]418567[/snapback]</div>

I am confused. I have a 07, and there is no "a/c" button on the dash. There is a "auto" button on the MFD, and a "ac" on the steering wheel, but none I know of on the dash. Can someone clarify?
[/b]

I was referring to the "Auto A/C" light on the dash board. Not a button. This means that the system is set to automatically heat and cool the car to maintain the set temperature.

The climate screen should have an "Auto" button and an "A/C" button. At least my 2005 prius does.

[David Beale]

Probably the best explanation is how it works in the anti-Prius (see below). When you want to deselect use of the A/C the display indicates "ECONO" mode. i.e. economy mode. Less cost. A/C pump never comes on. You don't get to cool the car below outside temp. If you then select "defrost", it switches back to "AUTO" mode - A/C pump again enabled (for dehumidification in this case, but it keeps it enabled and uses it to dehumidify all the time and cool when required).

This is another reason I call my SUV the "anti-Prius". Most of the controls work the same as the Prius, but it uses fuel like it's never going to run out, so it's an anti-Prius.