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Toyota Sienna Heating / Cooling

179 messages,  Last post on Dec 02, 2012 at 9:08 PM

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What is this discussion about? Toyota Sienna, Heating / Cooling, Van

Messages Page 16 of 18

#150 of 179 Re: Toyota Sienna: Cold & Hot Air Flow [rookie9] by nicko333

Feb 22, 2011 (12:20 pm)

Replying to: rookie9 (Feb 05, 2007 12:54 am)
This might help clear things up for anyone that still has this question. The Sienna is DESIGNED to have the UPPER (ceiling) rear vents blow cold/AC air ONLY. The BOTTOM (floor) rear vents are the only vents that can blow warm/hot air. If you wish to heat the rear area (in a Sienna with a manual system), turn the fan speed selector (the one located on the dashboard) to "rear." On the rear control panel (located above the driver side captain seat/first row seat), select the foot air flow selector, turn the temp knob all the way to the right, and select the desired fan speed. Place your hand over the FLOOR vents. If the air is not warm/hot after 10 minutes of highway driving (15 mins side road), then you have a problem.

#151 of 179 Re: Toyota Sienna: Cold & Hot Air Flow [nicko333] by relooky01

Feb 22, 2011 (5:03 pm)

Replying to: nicko333 (Feb 22, 2011 12:20 pm)
On my 2005 Sienna with manual heater/air conditioner controls the air temperature from the upper and lower rear vents is the same - warm/hot when using the heater and cold when using the air conditioner. In addition I can find nothing in the owner's manual stating anything different.

#152 of 179 Re: Toyota Sienna: Cold & Hot Air Flow [nicko333] by wwest

Feb 23, 2011 (10:03 am)

Replying to: nicko333 (Feb 22, 2011 12:20 pm)
You CAN get heated airflow from the dash/upper vents AND the windshield vents but only via somewhat extreme measures. Turn the temperature setpoint all the way to MAX heat and manually select dash vents or defrost/defog/demist position.
 
That latter mode is how I most quickly defog the interior windshield surface.

#153 of 179 Re: Toyota Sienna: Cold & Hot Air Flow [relooky01] by wwest

Feb 23, 2011 (10:06 am)

Replying to: relooky01 (Feb 22, 2011 5:03 pm)
Yes, the owners manual only hints at the issue. If you read the factory shop/repair manual's information on the operation of the HVAC system then it becomes much easier to understand, clarify, the information in the owners manual.

#154 of 179 2004 Sienna A/C selector and Air intake selector problem by xsssssss1

Mar 26, 2011 (4:16 pm)

I have noticed that my 2004 Sienna manual A/C system has the following problem recently:
 
1. When I turn on A/C, the A/C selector light is on, some cold air comes out.
2. After 5-10 minutes, the air intake selector light automatically turns on, which indicates that it recirculates the air inside the car.
3. While A/C is on, I could not turn the air intake selector light off unless I turn the A/C off.
4. If I don't turn on the A/C, I can tune on/off air intake selector freely.
 
Has anyone any idea what is wrong? Is it an expensive repair?
 
Thanks,
 
Sean

#155 of 179 Re: 2004 Sienna A/C selector and Air intake selector problem [xsssssss1] by wwest

Mar 27, 2011 (9:13 am)

Replying to: xsssssss1 (Mar 26, 2011 4:16 pm)
A bit backwards but....
 
As a SAFETY measure recirculate will NOT remain on unless the A/C is operational. In recirculate mode there is a danger that the cabin atmosphere RH, Relative Humidity, will rise high enough (due to human metabolism, breathing, perpiration, etc.) to fog the windshield.
 
With the A/C operational there is generally enough dehumidification capability that the safety concerns are alleviated.

#156 of 179 2006 XLE A/C Climate Control by tuctem

Aug 04, 2011 (2:58 pm)

Owned van since 12/10 -had 34Kmi, now 39K. I need help.
Turning the Ignition to the ON position, I hear lots of noise coming from the passenger side of the console - as though there are stepping motors trying to reset to a "zero" position which they fail to find. Seems like it needs an input from a sensor ... to complete the loop - it may be related to the A/C system. Thx.

#157 of 179 Automatic A/ Csystem sienna 2006xle. by tuctem

Aug 16, 2011 (9:00 pm)

I am still trying to figure out why the front a/c unit - with the ign switch to ON -
engine not running, i hear a (stepper?) motor eager to find its reset point never finding it,
 mixing short stops with short run 'excursions" .
 
Today I noticed that the rear A/C panel's "auto mode" is stuck ON as indicated by its green LED ; i cannot "deselect" it. Could this be related to the above ?
Will someone tell me what is the state of the rear a/c panel lighs when the engine is tuned ON with no front A/C panel selection functions selected ?
 
I went to the dlr: serv advisor " you have no problem..."
 
Any ideas welcome. Thanks.

#158 of 179 A/C receiver by dnicklas

Aug 19, 2011 (1:26 pm)

Where is the Air conditioner receiver located? Is there a low limit switch on the receiver. A/C stopped working suddenly. Have checked the relay and it is working properly. Hopefully just a low limit switch.
 
Thanks,

#159 of 179 Re: A/C receiver [dnicklas] by tuctem

Aug 20, 2011 (12:35 pm)

Replying to: dnicklas (Aug 19, 2011 1:26 pm)
Where is the Air conditioner receiver located?
 
A picture shows it on one side of the condenser.
 
Possibly on the driver's side. A plastic cowling needs to be removed
 
to expose the condenser - I see plastic "buttons" holding it in
 
place.
 
Condenser is located in front of the radiator.
 
Pictures are accessible by membership at your
 
local Library - they are ok

Messages Page 16 of 18

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