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Toyota Sienna Heating / Cooling

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#23 of 93 Re: weird climate control problem [silversalvage] by wwest Nov 27, 2007 (7:46 am)
Replying to: silversalvage (Nov 26, 2007 10:57 pm) Asian vehicles predominantly use climate control designs by NIpponDenso, Denso US here stateside. These systems have long been flawed in that they are unusually prone to interior windshield fogging. Additionally there is NO modern car manufactured that will allow the system to remain in recirculate with the A/C off or disabled. For instance if you encountered an area of outside temperatures nearing 35F in your trip to vegas the A/C would have been disabled automatically even when/if the light came back on when you turned it on manually.   Since about '01 there have been no less than 4 "fixes" of one type or another to address the issue of sudden and spontaneous interior windshield fogging for Toyota and Lexus vehicles. IMMHO what is really needed, has been needed, is a way to detect that the windshield interior surface is approaching, its temperature is declining, to the dewpoint of the cabin atmosphere.   I wouldn't be at all surprised if Denso has now added a cabin airflow humidity sensor, or is somehow deriving, computing, Rh from other sensor signals, and thereby automatically switching to "FRESH" mode if the cabin Rh is rising to the level that might result in windshield fogging.   So yes, a high humidity level in the normally warm daytime coupled with the normally COLD nights in vegas would likely result in a more properly designed system automatically switching out of recirculate mode, especially with 4 or more people on board.   And my advice would be, regardless of marque, NEVER use recirculate mode during coolish or cold weather absent keeping your interior windshield surface THOROUGHLY HEATED. Replies to this message: ateixeira (Nov 27, 2007 10:25 am) bhlh (Dec 26, 2007 11:21 pm) wwest (Dec 27, 2007 9:52 am) wwest (Dec 27, 2007 11:50 am)
#24 of 93 Re: weird climate control problem [wwest] by ateixeira Nov 27, 2007 (10:25 am)
Replying to: wwest (Nov 27, 2007 7:46 am) Just recognized your handle from Sienna Club. I'm juice_man over there.
#25 of 93 Recycle goes off automatically by caravan2 Nov 27, 2007 (8:54 pm)
I have also note that the when I push recycle button, it automatically goes off after a while.   I was going to complain to the dealer on next service.   Everyone, please post how your vehicle behaves.   Thanks
#26 of 93 Re: weird climate control problem [wwest] by bhlh Dec 26, 2007 (11:21 pm)
Replying to: wwest (Nov 27, 2007 7:46 am) I just posted a question about the same problem and then ran across thisw discussion with your reply. Are you saying that the air intake selector (one our 2 month old 2008 Sienna LE) will default to "fresh" no matter how cold it is or even if the heat is not on? Page 350 of the manual says to hold the button in for 2 or more seconds to override the system defaulting to the "fresh" position every 3 to 5 minutes. I was going to take it in to the dealer for repair or replacement but you are saying the system was designed this way. If so, then it is designed poorly as the driver should have the option of making the determination if the button should be set to "Fresh" or "recirculate". Like a toggle off/on switch. I can see it if the A/C is turned on to clear the windows but for those cold mornings I don't like having to push the button in for 2 seconds everytime after starting the car. Poor design. Replies to this message: wwest (Dec 27, 2007 9:52 am) wwest (Dec 27, 2007 11:50 am)
#27 of 93 Re: weird climate control problem [bhlh] by wwest Dec 27, 2007 (9:52 am)
Replying to: bhlh (Dec 26, 2007 11:21 pm) Since these modern day automatic climate control systems run/use the A/C system all year around it has become more worthwhile to squeeze the very last erg of efficiency from them. So if previously "conditioned" air can be "held" within the cabin for an extended period that would clearly cut back on the workload of the A/C compressor.   So the exhauster port for cabin air outflow has now been minimized and recirculating up to 30% of the airflow reduces the cabin pressure that would otherwise be created by the blower speed by the same amount. Replies to this message: wwest (Dec 27, 2007 11:50 am)
#28 of 93 Re: weird climate control problem [wwest] by wwest Dec 27, 2007 (11:50 am)
Replying to: wwest (Dec 27, 2007 9:52 am) http://www.globaldensoproducts.com/cc/cacs/hvac.html
#29 of 93 2004 Toyota Sienna drivers-side heat blowing cold? by randster Dec 29, 2007 (12:05 pm)
OK, we purchased the Toyota Sienna brand new and it's been a great van up to now. We have a little over 40,000 miles on it and the other day the front cabin climate control started behaving badly. The passenger and rear AC/Heat works perfectly, however the drivers side blows a constant cold air, almost as if the temperature selected was 70d F. I have tried all the possible setting combinations and nothing seems to work.   Note: For the longest time, we heard a rattling or clicking sound in the dash that the dealer could not locate, and now that the left-side climate control is not working that sound is completely gone. Not sure if this was related or not?   Any idea's? Replies to this message: wwest (Dec 29, 2007 2:47 pm) randster (Jan 04, 2008 11:18 pm) jeffj2 (Mar 04, 2009 4:54 pm)
#30 of 93 Re: 2004 Toyota Sienna drivers-side heat blowing cold? [randster] by wwest Dec 29, 2007 (2:47 pm)
Replying to: randster (Dec 29, 2007 12:05 pm) I would guess that the driver's side solar radiation sensor at the top/front of the dash, bottom of the windsheild, was failing intermittently and that was causing one of the servomotors to continuous "hunt". Now that it has fully failed it thinks the driver is always in BRIGHT sunlight.   What happens if you set the L/R to "common"..? Replies to this message: randster (Jan 04, 2008 11:18 pm) jeffj2 (Mar 04, 2009 4:54 pm)
#32 of 93 2008 Toyota Sienna LE Air Intake Selector by bhlh Dec 26, 2007 (10:53 pm)
Recently purchased a 2008 Sienna LE with manual A/C system. The air intake selector button seems to default to outside (fresh) air, no matter what position the air flow selector is in. For example if the air flow selecector is set to "panel" or bi-level" on cold days the air selector is defaulted to "fresh" air. If the air intake button is pushed to "Recirculate" then after about 3 minutes it defaults back to "fresh" and you get cool air. After reading page 350 in the manual it says to push the button for at least 2 seconds so it will stay in the "Recirculate" position. But if you go shopping and restart the car it's back to "fresh" again. Is this working as designed ? Is this a design flaw?   It would seem that in winter conditions if you push the button for "recirculate" the system should stay in that mode (for heat anyway" until the button is pushed for "fresh". In other words it should be a toggle (off or on).   Has anyone else had this problem? Is there a solution? Replies to this message: ateixeira (Dec 28, 2007 8:20 am)

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