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Toyota Sienna Heating / Cooling

92 messages,  Last post on Nov 06, 2009 at 7:32 AM

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#83 of 92 Cooling Temp Output Front/Rear by gedgoudasl Jun 09, 2009 (4:26 pm)
Problem is resolved. A temperature sensor was unplugged which caused the computer to read that the rear of the van was at 20 degrees. So it did what it was supposed to do and turned on heat in the rear, as hot as 100 degrees. It took 5 times for a technician to realize from the diagnostic printout that a 20 degree reading in the rear was a problem. The sensor became unplugged when the dealer installed the DVD system. Works like a charm now.
#84 of 92 Re: Dirver Side not blow cold, but Passenger side is! [ojnucci] by erin602 Jun 19, 2009 (5:23 pm)
Replying to: ojnucci (May 04, 2009 2:34 pm) Mine was doing the same thing. After extensive research on dual climate controlled vehicles, the NUMBER 1 cause was LOW REFRIGERENT. I went to Auto Zone and purchased an 18oz bottle with gauge--$26.99. Read the psi when the compressor kicks on- if low then add. Listen and you can hear the difference. My driver side air is so cold now!!!!! Yipee and I saved alot of time and money Replies to this message: ateixeira (Jun 22, 2009 11:59 am)
#85 of 92 Re: Dirver Side not blow cold, but Passenger side is! [erin602] by ateixeira Jun 22, 2009 (11:59 am)
Replying to: erin602 (Jun 19, 2009 5:23 pm) Kudos for a nice DIY-fix.
#86 of 92 AC oil leak- 2002 Sienna by lunarmist Jun 28, 2009 (6:38 am)
We found a puddle of oil on the ground just behing the rear passenger tire. I assume it is from the rear AC unit. I checked and there is no cold air from the rear vents. The front AC is still giving out cold air. The local Toyota dealer said the front and rear AC units share the same R-134a refrigerant.Also, what should I notice looking through the little glass window on top of the receiver/drier? Does a can of R-134a also include the oil? Am I looking at a very expensive repair? Replies to this message: ateixeira (Jun 29, 2009 8:32 am) lunarmist (Jun 30, 2009 12:34 am)
#87 of 92 Re: AC oil leak- 2002 Sienna [lunarmist] by ateixeira Jun 29, 2009 (8:32 am)
Replying to: lunarmist (Jun 28, 2009 6:38 am) Where is whats-his-name? He would know.   All I can recall is him saying the rear has an evaporator but not a seperate compressor.   Are you sure it was oil? Usually I only get water from the condensation there. Replies to this message: lunarmist (Jun 30, 2009 12:34 am)
#88 of 92 Re: AC oil leak- 2002 Sienna [ateixeira] by lunarmist Jun 30, 2009 (12:34 am)
Replying to: ateixeira (Jun 29, 2009 8:32 am) So far so good, I added a 16 oz container of all-in-one refrigerant and oil to the system and I'm getting very cold A/C from both the front and rear. Still would like to know if the oil leak has been experienced by anyone else?
#89 of 92 2000 sienna Blower works fine but no cold air by skevin Sep 07, 2009 (5:01 pm)
My 2000 Sienna AC worked fine for an 8 hour trip, next day no cold air. The AC push in switch lights up green, no flashing light to indicate an AC problem. My question is this, could I lose freon over night from a leak, and what types of problems would a flashing AC light be triggered by ie) no freon. In addition, how can I tell if my compressor is not engaging.
#90 of 92 ventilation on-off by nic11 Oct 29, 2009 (8:31 am)
I have a 2003 Sienna. Last weekend, the ventilation system made some strange sounds for a few minutes. After that when I drive fast enough I can feel the flow of air from outside coming in although the fan control is in the off position. I took it to the mechanic and he thinks that this is the normal the ventilation operates. But I don't remember the car letting the airflow in when the fan control was in off in the past. Can anybody please let me know if that's how it's supposed to be or not? Thanks! Replies to this message: wwest (Oct 30, 2009 8:54 am)
#91 of 92 Re: ventilation on-off [nic11] by wwest Oct 30, 2009 (8:54 am)
Replying to: nic11 (Oct 29, 2009 8:31 am) If you put the system in defrost/defog/demist mode the natural airflow due to forward speed will be minimized. I would recommend recirculate mode but some modern day systems will automatically switch back into fresh mode within ~2 minutes if the A/C is off.
#92 of 92 Re: '05 Sienna A/C quit working completely [kharding] by lee104 Nov 06, 2009 (7:32 am)
Replying to: kharding (Jul 09, 2008 8:09 am) Yes, This works. Thank you.

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