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post #1 of 38 Old 07-31-2009, 02:36 PM Thread Starter
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Automatic HVAC Question

Hi
08, LTD with auto front and rear climate control.

Scenario #1
outside temp 85 degrees, car sitting in sun all day long, inside temp must be about 100 degrees. Air is on recirculate when engine turns on. Why?? Doesn't it make more sense to pull fresh 85 degree air then to recirculate 100 degree air?

Scenario #2
Driving with AC on, outside temp 85 degrees, temp for driver, pass, rear set at 73 degrees. For no reason, pass. setting goes to "max heat" Another time, rear temp goes down to 68. (did not touch any of the controls).


Any explanation or solution to this??
Thanks.
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post #2 of 38 Old 07-31-2009, 03:29 PM
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Scenerio #1 Opinion is if you shut off the outside air and recycle the inside air it will cool down faster. Guess you would have to run a some controlled tests to validate the manufacturers theory..

Scenerio #2..your Limited uses an artifical intelligence neural network to control the HVAC..."DO NOT QUESTION THE TOYOTA" :ahhhh:

See link for description

Limited HVAC Neural Network

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post #3 of 38 Old 07-31-2009, 08:41 PM
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Quote:
Originally Posted by DeltaForce View Post
Hi
08, LTD with auto front and rear climate control.

Scenario #1
outside temp 85 degrees, car sitting in sun all day long, inside temp must be about 100 degrees. Air is on recirculate when engine turns on. Why?? Doesn't it make more sense to pull fresh 85 degree air then to recirculate 100 degree air?

Scenario #2
Driving with AC on, outside temp 85 degrees, temp for driver, pass, rear set at 73 degrees. For no reason, pass. setting goes to "max heat" Another time, rear temp goes down to 68. (did not touch any of the controls).


Any explanation or solution to this??
Thanks.

Yeah, your scenario 1 has been my frustration with my 09 since the warmer temps came around. I have the exact same problem. AUTO off, AC off, and I turn the RECIRC off, yet I can turn the car off, and then on again, and the RECIRC automatically comes on again and blows the steaming hot interior cabin air in my face. I spent C$40 K to have to push the recirc every time I get in the car???

This only occurs if the temp setting is colder than interior cabin temp. I can understand the recirc coming on IF I have the AC on, because recirc'd AC air will cool the interior much more quickly. However, I am more a fan of fresh air than AC, so I often have the AC and AUTO off, and therefore find myself driving a minute or two before realizing that the temp is rising and have to push the the recirc button. If Toyota wants the recirc to be automatic, then it should only come on if the AC is on, not if the AC is OFF! OR, it should only work automaticaly in AUTO mode.

Anyway, I have my first appt with the dealer Thurs, and besides the rotten egg smell that I am getting every time I accelarate (even if I have windows closed, AC on and recirc on, believe it or not), this recirc isssue is at the top of my list.

We'll see if they have a fix, but I'm not holding my breath.

Cheers.

Former owner of 09 HL Sport, loaded Cdn version.



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post #4 of 38 Old 07-31-2009, 10:18 PM
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Quote:
Originally Posted by DeltaForce View Post
Hi
08, LTD with auto front and rear climate control.

Scenario #1
outside temp 85 degrees, car sitting in sun all day long, inside temp must be about 100 degrees. Air is on recirculate when engine turns on. Why?? Doesn't it make more sense to pull fresh 85 degree air then to recirculate 100 degree air? Any explanation or solution to this?? Thanks.
I was very disappointed to read this. I have an '06 HL Ltd. that does the same thing. This was one area I hoped would have been addressed for the newer models. My '09 Ltd. has just arrived although I won't be picking it up for a few weeks. From what I'm reading, it looks like I can look forward to a few more frustrating years, having to manually turn the recirc button off so I can pull cooler air in from outside!!

Peter

Lease Transferred - Canadian '09 HL Ltd, Classic Silver Metallic with Nav, ash interior, body side moulding, hood deflector, Camry trumpet horns, Philips X-Treme Power bulbs, Toyota 3 piece rubber floor and cargo mats. My 2011 Explorer Limited has arrived.
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post #5 of 38 Old 08-01-2009, 02:30 PM
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Guys......the auto climate control puts the system on recirc because this is the fastest way too cool the inside of your vehicle. You may not like it but I am sorry its the truth and no, Toyota is not the only makers that know this.

My dads 04 Chrysler Pacifica does it, my 07 Tundra did it, my 06 MINI Cooper S does it, etc....

For those of you that have the Auto Climate control...run it in manual mode instead if you don't like recirc.
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post #6 of 38 Old 08-01-2009, 07:30 PM
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Quote:
Originally Posted by Cooper S View Post
Guys......the auto climate control puts the system on recirc because this is the fastest way too cool the inside of your vehicle. You may not like it but I am sorry its the truth and no, Toyota is not the only makers that know this.

Absolutely not true, and even your owners manual will tell you so. The owners manual will tell you to lower the rear windows (slightly) to more quickly cool the cabin after the car has been setting closed up on a bright sunny day.

My dads 04 Chrysler Pacifica does it, my 07 Tundra did it, my 06 MINI Cooper S does it, etc....

So, if others do it then it must be right...??

NOT...!!

For those of you that have the Auto Climate control...run it in manual mode instead if you don't like recirc.
Your Toyota dealer can set a c-best option that disallows the recirc mode in this situation.

I always run the A/C in my RX300 at MAX cooling for highest efficiency during the times cooling is required but ALWAYS over-ride the recirc mode until the cabin is cooled to a reasonable level and then switch it to recirc.

I use the blower speed to moderate the level of cooling desired.
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post #7 of 38 Old 08-01-2009, 07:40 PM
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I don't like a lot of air blowing on me so I usually regulate the temp by adding some heat while the A/C is on. I find my Highlander's A/C system is very, very effective and usually have the heat turned about 25% of the way to hot in order to produce a comfortable temperature. I'd still rather do it that way than have HAL do it for me....



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post #8 of 38 Old 08-01-2009, 08:00 PM
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Quote:
Originally Posted by Cooper S View Post
Guys......the auto climate control puts the system on recirc because this is the fastest way too cool the inside of your vehicle. You may not like it but I am sorry its the truth and no, Toyota is not the only makers that know this.

My dads 04 Chrysler Pacifica does it, my 07 Tundra did it, my 06 MINI Cooper S does it, etc....

For those of you that have the Auto Climate control...run it in manual mode instead if you don't like recirc.
Unfortunately, the problem as originally reported, unwanted recirculate activation, happens regardless of auto/manual setting. I hate the "Auto" mode since I like to be in as much control of the vehicle's operation as possible (same feeling with driving lights/auto headlights), so I use it about once a year. However, I still have to deactivate the recirculate button every time I start up in the summer. All of my start ups are without AC as I do like others here... I turn my AC off prior to reaching my destination to lighten the load on the battery and expel any moisture before engine shut off.

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post #9 of 38 Old 08-01-2009, 08:22 PM
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Well we know that Chrysler, Toyota and BMW think its the right thing to do when the Auto Climate control is first turned on. I like it the way it is.
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post #10 of 38 Old 08-02-2009, 06:44 AM
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Quote:
Originally Posted by TrailDust View Post
I don't like a lot of air blowing on me so I usually regulate the temp by adding some heat while the A/C is on. I find my Highlander's A/C system is very, very effective and usually have the heat turned about 25% of the way to hot in order to produce a comfortable temperature. I'd still rather do it that way than have HAL do it for me....
The Base model does not have all of the computer controlled logic.

Only the dual zone automatic system uses the artifical intelligence neural network logic to control things

You have more manual control over things in the base model

Also the AC uses a compressor and pulley that is a continously variable capacity type in which the its capacity can be varied in accordance with the cooling load of the air conditioning which reduces the load on the engine and improves fuel economy

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post #11 of 38 Old 08-02-2009, 08:56 AM
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If you have AC and AUTO on, yes it makes sense that the recirc would come on to cool the interior more quickly. I do notice that recirc'd air is cooler than cooled air from outside.

HOWEVER, my issue is that even when I have AUTO AND AC OFF (I just want fresh unconditioned air), the recirc button still comes on when I restart the vehicle.

How is it logical that recirc'ing 100 degree interior cabin air will cool the interior more quickly

Anyway, wwest, thanks for the info on the c-best setting. Will raise it with my dealer on Wed when my HL goes in for its first visit...hopefully it will take care of this annoying situation.

Cheers.

Former owner of 09 HL Sport, loaded Cdn version.



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post #12 of 38 Old 08-02-2009, 11:02 AM
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Let us know if the dealer is able to change that setting for you
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post #13 of 38 Old 08-02-2009, 11:20 AM
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Quote:
Originally Posted by summerwind View Post
The Base model does not have all of the computer controlled logic.

You have more manual control over things in the base model
That was one of the main reasons I bought the Base model...I'm not a technophobe, but I don't like "computer controlled" anything and prefer the manual touch.

BTW, man, I don't mean to imply by my answer that I thought you were calling me a technophobe...it's little things like that which can lead to misunderstanding...thank goodness for emoticons....



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post #14 of 38 Old 08-03-2009, 06:31 AM
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Quote:
Originally Posted by TrailDust View Post
BTW, man, I don't mean to imply by my answer that I thought you were calling me a technophobe...it's little things like that which can lead to misunderstanding...thank goodness for emoticons....
Wasn't implying anything.

Just clarifying.

The one thing Toyota owners have to deal with is "Toyota knows what is best for you" engineering practice.

They make it difficult for an owner to make custom changes to how things work and it took a while for them to install a switch to allow the owner turn off VSC when situations call for it.

Toyota builds a great product but they seem to feel owners are idiots and need a nanny to protect them.

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post #15 of 38 Old 08-03-2009, 06:42 AM
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Quote:
Originally Posted by summerwind View Post
...
Toyota builds a great product but they seem to feel owners are idiots and need a nanny to protect them.
+1
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