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#1 (permalink) Old 01-23-2007, 05:38 PM
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Default Air Conditioning

(This may have been asked before, but I didn't see anything when searching through old posts.)

Is "Air Conditioning" another term for Auto/Climate Control/thermostat? Because anytime I hit the Auto button, the Air Conditioning "button" is on (on the touch screen). I keep my temp setting pretty low (67-69 degrees), so maybe that's why the A/C is going on.

And is it true that toggling the vent option (recirculated/outside air) disables the Auto/Climate Control/thermostat function?

Also, is there any drain on the auxiliary battery if you forget to turn the lights off? (I have a 2004 Prius). (I'm still getting used to turn this puppy off.)
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#2 (permalink) Old 01-23-2007, 05:50 PM
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Default Re: Air Conditioning

Quote:
Originally Posted by apostasy10
(This may have been asked before, but I didn't see anything when searching through old posts.)

Is "Air Conditioning" another term for Auto/Climate Control/thermostat? Because anytime I hit the Auto button, the Air Conditioning "button" is on (on the touch screen). I keep my temp setting pretty low (67-69 degrees), so maybe that's why the A/C is going on.

And is it true that toggling the vent option (recirculated/outside air) disables the Auto/Climate Control/thermostat function?

Also, is there any drain on the auxiliary battery if you forget to turn the lights off? (I have a 2004 Prius). (I'm still getting used to turn this puppy off.)
Yes, Air Conditioning can be heating, cooling, what ever the car needs to meet the temperature you set. Push any button on the climate control and it overrides the Auto/AC. You have to turn it back on. It will switch to recirc on its own if it's needed. I leave mine on Auto and just adjust temp, with the occassional use of defrost when needed.

I never turn off my lights. It has never caused me a problem.

Hep
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#3 (permalink) Old 01-23-2007, 06:49 PM
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Thanks, hep. Was worried that I might have a/c and heat battling against each other. Not very efficent.

So you run your lights during the day?
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#4 (permalink) Old 01-24-2007, 12:25 AM
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Not all the 'override' buttons turns off the AUTO mode. Fan speed, vent outlet choices and disabling 'AC' will turn off 'AUTO', but the temp will still be maintained as far as it is capable under those conditions.

AC compressor can and often does run when there is a heat demand. This is intentional to reduce humidity. In a conventional car that is not equipped with climate control, in order to 'reduce' AC temp, you have to add heat, so there is a 'battle' there. However, it won't hurt anything, and often is necessary to prevent fogging of the windows even in winter.

Anyway, the compressor is a continuously variable speed, so it can adjust to the most efficient speed to properly cool and/or dehumidify. Once it reaches a minimum low, it will cycle on/off at that low speed as needed. The soft AC button doesn't force the compressor on, but rather allows it to operate. If the button shows off (no yellow bar underneath), then the AC compressor is disabled. In climates that are cool enough and you can tolerate the humidity, this can save energy.
Note though that the HV battery temperature is controlled by drawing in cabin air over it, with the assumption that the cabin air is conditioned.
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#5 (permalink) Old 01-24-2007, 02:06 AM
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It kinda bugs me how the car goes into automatic mode after turn on/off the front window defog (on the steering wheel). I don't want the fan running when I turn it off. Whine...

'06 package #1, seaside pearl.
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#6 (permalink) Old 01-24-2007, 09:36 AM
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One thing I was impressed with on the trip back from the dealer was how quickly and easily I could switch to the defroster and back, and how effective the defroster was. And this was while just getting used to the new car and trying to follow tricky mapquest directions to a restaurant.
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#7 (permalink) Old 01-24-2007, 11:48 AM
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Quote:
Originally Posted by apostasy10
Thanks, hep. Was worried that I might have a/c and heat battling against each other. Not very efficent.

So you run your lights during the day?
Yes, it's pretty well established that "daytime running lights" make me less likely to be in an accident. Since Prius does not have this in the US version (lucky Canadians) I just leave my lights on day and night. They will turn off when you power down and open the DRIVERS SIDE DOOR. You do need to be careful, if for instance, you go in the passanger side, power up to eject a CD and then power off and leave. The lights will not turn off.

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#8 (permalink) Old 02-19-2007, 12:18 AM
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Default Heater On or Off ?

Dear PriusOnline:
Help! My wife and I are having a disagreement over the temperature controls of our 2004 Prius. Here is the situation:
- Outside Temp 60 degrees
- The car has been sitting in the sun, hence the inside temp is in the high 70’s or higher.
- Fan is set to Auto
- AC is set to “off” no yellow bar
- I have set the “desired temperature” to 66 degrees F. ( I like using the steering wheel keys)

Here is the big question? Is the heater on? Is the heater on and blowing hot air into the car? My wife thinks this is the case. My intuition says the heater is off and we are just getting outside air being blown into the car. I also believe that at some point the heater will turn on when the interior of the car cools down below 66 degrees F.

So who is correct? Is she always right or do I, as is most often the case, the one who needs to eat humble pie?

Thank you in advance for your thoughts,
Egjen
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#9 (permalink) Old 02-19-2007, 01:55 AM
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You are correct.

The system will take into account the cabin air and if the cabin is above the set point, the system will add no heat to the air coming in.

In Auto mode with the A/C off, it will switch to the dash vents and bring in unheated outside air for a while. If the sensor in the windshield detects a strong sun heat load, it will continue to bring in cool outside air until the cabin gets a few degrees below the set point.

Once that happens, the car will want to keep bringing in fresh air so the fan will drop to low and if bringing in outside air is enough to counteract the sun, it will continue to do that. If the sun is not strong enough and the cabin temperature continues to drop, the system will switch to both dash vents and floor vents and add some heat to the air. This is sometimes referred to as "bi-level" or "hi-lo" in older american cars.

The car will take into account the outside air but it's primary function is to bring the cabin to the set point.

I hope that helps.

2007 Prius, Package 5
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#10 (permalink) Old 02-19-2007, 02:05 AM
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Another point to consider:
Even if the ambient outdoor temp is showing as 60 degrees, the location where the air intake is, at the grill near the wipers, gets hot in the sun, as does the ducts in the dash. This can cause the air coming out of the vents to appear heated, because in fact they are, but not by the cooling system or the heaters, but by the sun!

If the car were really trying to add heat, you'll see the climate display show that it is using the floor vents instead of the dash vents, assuming the system is in complete auto sans AC compressor.
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