Last post on Sep 23, 2010 at 4:38 PM
You are in the Toyota Sienna
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Toyota Sienna, Heating / Cooling, Van
#1 of 3 2010 Sienna Rear Heating/Cooling
Sep 23, 2010 (9:44 am)
My rear heat/cooling fan knob (located on front dash) has a setting that gives control of heating/cooling to person in mid-left seat. Other settings on same knob are for rear fan speed. When I bought the van I specifically asked how to control rear warm or cold temperature from the front control panel (like when no one is back there). I was told that if I chose the fan speed using the front control knob I would get the same temperature as I set with the front controls for the front cabin. This isn't happening. First winter with the van I turned on hot air in the front and set the rear fan to high speed to aid in warming the whole interior. For weeks I wondered why I was feeling a cool draft and the van wasn't getting very warm, then finally went back there and found I was blowing ice cold air in the rear. It's inconvenient and maybe dangerous for me to pull to the roadside to change the rear temperature setting when necessary. Can anyone confirm that their 2010 Sienna does this? Is it wrong for mine to work this way? Any help would be appreciated. Haven't discussed with dealer yet.
#2 of 3 Re: 2010 Sienna Rear Heating/Cooling [penzzz]
Sep 23, 2010 (2:27 pm)
Have the dealer check the diagnostics for the rear HVAC to see specifically what temperature the system is reporting for the rear. It may be reading a high temp and is turning on the AC. I had a similar problem on my 08. Rear system was unplugged and the default temperature was zero so the system turned on heat when we were wanting AC. With the temp 100 outside we were getting 100 degree heat in the rear and 50 degree cold AC in front.
#3 of 3 Re: 2010 Sienna Rear Heating/Cooling [gedgoudasl]
Sep 23, 2010 (4:38 pm)
Thanks for the informative reply, I will get in touch with the dealership. My heating/cooling system is completely manual (I don't select a temperature setting) so I'm not sure it even has sensors that would choose between providing warm or cold air in order to obtain the temperature I select. My h/c system on my Honda accord is more automated and requires a temperature setting. In the SiennaI have to manually select between red and blue indication on the dash knob.