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#1 (permalink) Old 03-30-2006, 09:59 AM
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Default temperature inside car

On a long trip back north from Florida last week, I had to turn on the heat due to the late spring cold snap across the South. My Prius is a 2004 and I noticed it doing something I'd never noticed before: I would set the temp at 72 and the heat would come on briefly (maybe for 5 minutes) followed by cool air as if the summer air conditioning had then clicked on. I am not noticing this happening now that I'm back in town driving shorter distances. When I called the Toyota dealer to bring it in to be checked out, I was told by the fellow at the desk (not a technician) that this is "normal," that the computer was regulating the temperature inside the car in this way. Have you had this happen with your vehicle? I'm wondering if I'm listening to a good source of information.
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#2 (permalink) Old 03-30-2006, 11:59 AM
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For me, sometimes 72 is "cold" and sometimes it is "warm".. but as they said, perhaps its just regulating the inside of the car. There is an "auto" feature on the 2006, which adjusts the low/med/high to regulate the cabin temp.. but I imagine the 72 without it does the same, just adjusts the temperature instead of the airflow.

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#3 (permalink) Old 03-30-2006, 12:16 PM
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"I would set the temp at 72 and the heat would come on briefly (maybe for 5 minutes) followed by cool air as if the summer air conditioning had then clicked on."
********************
Presuming you set the system on AUTO, it's normal for the air temp (produced thru the vents) to vary up and down A LITTLE. But it should not be a radical change like; from HOT to COLD. As the cabin temp nears the desired level, the system should "back off" a little both in temp and fan speed. At least that's the way it's supposed to work. I prefer manual control of the fan speed so I don't often use the AUTO function.

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#4 (permalink) Old 03-30-2006, 02:24 PM
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We often feel warmer when warm air is being blown directly on us. Then, when the desired temp is reached, we feel cold again. For one thing, the air being blown on us is warmer than the set temp.
Radiant heat can give the same effect, but that's not what is going on here.

Also, to keep the humidity down (and we usually have lots of it here), the AC compressor is used even when heating, so if that ends up blowing directly on you (usually comes out of the dash vents), you will feel colder since the exit temp is colder than the cabin ambient temp.

So, direct the vents to not blow on you directly, and you won't notice the change as much.
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#5 (permalink) Old 03-30-2006, 02:36 PM
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It's normal. I've experienced it several times when we had a cold snap here (by cold, I mean -2C hahaha). I'd set the system at 21.0C or maybe 21.5C and it'll blow hot air for 5 mins (when it gets hot) then blow cooler air afterwards. It's just regulating the air temperature. If I wanted hot and hotter, then I would've set it to 23.5C and it'll continue to blow warm air long after it would've stopped if I had it at 21.0C

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#6 (permalink) Old 03-30-2006, 05:00 PM
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Also, to keep the humidity down (and we usually have lots of it here), the AC compressor is used even when heating, so if that ends up blowing directly on you (usually comes out of the dash vents), you will feel colder since the exit temp is colder than the cabin ambient temp.

I've noticed this, and it bothers me. With it set to Auto, if I hit the front defroster, I get cold air out the dash vents. This should not be, since the ar, cooled during dehumidification, should be reheated before being expelled through the vents. I have to turn the heat up every time I hit defrost, a distinctly "non-auto" behavior for "auto" mode.

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#7 (permalink) Old 03-30-2006, 05:38 PM
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Quote:
Originally Posted by KTPhil
I've noticed this, and it bothers me. With it set to Auto, if I hit the front defroster, I get cold air out the dash vents. This should not be, since the ar, cooled during dehumidification, should be reheated before being expelled through the vents. I have to turn the heat up every time I hit defrost, a distinctly "non-auto" behavior for "auto" mode.
You may want to get it checked. My 04 doesn't act that way. I leave my temp set to 72 with the auto/ac on all of the time. When I call for the defroster, most of the air flow is to the windshield, and what little comes out the vents is a mild temperature.
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#8 (permalink) Old 03-31-2006, 08:17 AM
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The vents, especially the ones near the door are peculiar in many cars, as they often purposely receive leaked air.
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