05 Sienna...rear heat blows cold - Toyota Nation Forum : Toyota Car and Truck Forums


» Auto Insurance
» Featured Product
Advertisement
Wheel & Tire Center

Go Back   Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Truck, SUV and Van Forums > Sienna Forum > 2nd Generation (2004-2010)

2nd Generation (2004-2010) Discussion area for the second generation Toyota Sienna.

ToyotaNation.com is the premier Toyota Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 03-18-2013, 07:31 PM   #1 (permalink)
New TN User
 
Join Date: Mar 2013
Location: Kentucky
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View MajLeagueCamper's Photo Gallery
05 Sienna...rear heat blows cold

Just bought an 05 Sienna...the rear heat only blows cold. Temp does not change any when the temp selector is turn to cold or hot. Any pointers on were to start with this? Coolant level is full.
MajLeagueCamper is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 03-19-2013, 08:32 PM   #2 (permalink)
Official TN Member
 
Join Date: Jun 2012
Location: Mid Hudson Valley, New York
Posts: 474
Gameroom cash: $274100
Thanks: 21
Thanked 82 Times in 77 Posts
Supreme Member
iTrader Score: 0 reviews
View Fibber2's Photo Gallery
Are you ready to pull the interior rear panel to look at the rear heater? There is an electrically operated solenoid water valve that would be a good item to examine first. Plus an airmix shutter, IIRC. I can give you some pointers / diagrams if you are looking to tear into it.
Fibber2 is offline   Reply With Quote
Old 03-19-2013, 08:57 PM   #3 (permalink)
New TN User
 
Join Date: Mar 2013
Location: Kentucky
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View MajLeagueCamper's Photo Gallery
Re: 05 Sienna...rear heat blows cold

Yes definitely willing to tear into the panel back there. Just waiting on a somewhat warm day to do it. Any pointers or diagnostics steps would be great.

Sent from AutoGuide.com Free App
MajLeagueCamper is offline   Reply With Quote
Old 03-20-2013, 07:50 PM   #4 (permalink)
Official TN Member
 
Join Date: Nov 2009
Location: earth
Posts: 89
Gameroom cash: $108603
Thanks: 9
Thanked 4 Times in 4 Posts
iTrader Score: 0 reviews
View toyotoyo's Photo Gallery
Re: 05 Sienna...rear heat blows cold

Check the coolant level in the overflow tank, it should be between min amd full.

Sent from AutoGuide.com Free App
toyotoyo is offline   Reply With Quote
Old 03-21-2013, 10:15 AM   #5 (permalink)
Senior TN Member
 
Join Date: Apr 2010
Location: Seattle
Posts: 1,713
Gameroom cash: $310600
Thanks: 111
Thanked 105 Times in 89 Posts
iTrader Score: 0 reviews
View grandpapa's Photo Gallery
not sure you did it or not, can you adjust the temp from the 2nd row overhead panel?
grandpapa is offline   Reply With Quote
Old 03-21-2013, 05:19 PM   #6 (permalink)
New TN User
 
Join Date: Mar 2013
Location: Kentucky
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View MajLeagueCamper's Photo Gallery
Re: 05 Sienna...rear heat blows cold

No matter if the temp selector in the second row is on cold or hot it still blows cold. If the a/c is turned on it blows colder.

Sent from AutoGuide.com Free App
MajLeagueCamper is offline   Reply With Quote
Old 03-21-2013, 09:33 PM   #7 (permalink)
Official TN Member
 
Join Date: Jun 2012
Location: Mid Hudson Valley, New York
Posts: 474
Gameroom cash: $274100
Thanks: 21
Thanked 82 Times in 77 Posts
Supreme Member
iTrader Score: 0 reviews
View Fibber2's Photo Gallery
I've got some stuff on the rear unit that I've collected, but need to get it organized and uploaded to my photo site for viewing. Pretty busy with work right now, so probably early next week?
Fibber2 is offline   Reply With Quote
Old 03-21-2013, 09:54 PM   #8 (permalink)
New TN User
 
Join Date: Mar 2013
Location: Kentucky
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View MajLeagueCamper's Photo Gallery
Re: 05 Sienna...rear heat blows cold

That'll work for me. No rush.
MajLeagueCamper is offline   Reply With Quote
Old 12-30-2013, 09:31 PM   #9 (permalink)
Official TN Member
 
Join Date: Jul 2011
Location: Wylie, TX
Posts: 542
Gameroom cash: $195600
Thanks: 9
Thanked 22 Times in 19 Posts
Lifetime Supreme Member
iTrader Score: 0 reviews
View sharkinstx's Photo Gallery
Fibber2, did you ever upload the info? I just noticed that our '08 has no rear heat, either.
__________________
Regards,
Steve

'08 Sienna LE FWD
'13 Tacoma PreRunner SR5 Double Cab Long Bed Texas Edition 4x2
sharkinstx is offline   Reply With Quote
Old 12-31-2013, 04:26 PM   #10 (permalink)
Official TN Member
 
Join Date: Jun 2012
Location: Mid Hudson Valley, New York
Posts: 474
Gameroom cash: $274100
Thanks: 21
Thanked 82 Times in 77 Posts
Supreme Member
iTrader Score: 0 reviews
View Fibber2's Photo Gallery
Hey Steve. To begin with, make sure that a button on the rear control panel is properly depressed and that you have a mode light on (applies to LE manual system). My kids have occasionally pressed a button part way and that seems to actually disable the fan and sometimes the temp control.

Manual or automatic? Exactly what's it doing? Fan and mode works but no heat? Front working properly?
Fibber2 is offline   Reply With Quote
Old 01-01-2014, 02:24 PM   #11 (permalink)
Official TN Member
 
Join Date: Jul 2011
Location: Wylie, TX
Posts: 542
Gameroom cash: $195600
Thanks: 9
Thanked 22 Times in 19 Posts
Lifetime Supreme Member
iTrader Score: 0 reviews
View sharkinstx's Photo Gallery
Quote:
Originally Posted by Fibber2 View Post
Hey Steve. To begin with, make sure that a button on the rear control panel is properly depressed and that you have a mode light on (applies to LE manual system). My kids have occasionally pressed a button part way and that seems to actually disable the fan and sometimes the temp control.

Manual or automatic? Exactly what's it doing? Fan and mode works but no heat? Front working properly?
Oh yeah, I've pressed the buttons (set it to floor), and the rear temp control knob is set to full hot. It's a manual a/c system, and the blower and mode buttons work. Plenty of heat from the front. I could spend the $15 to get the info from TIS, but I'd like to avoid that.
__________________
Regards,
Steve

'08 Sienna LE FWD
'13 Tacoma PreRunner SR5 Double Cab Long Bed Texas Edition 4x2
sharkinstx is offline   Reply With Quote
Old 01-03-2014, 05:52 PM   #12 (permalink)
Official TN Member
 
Join Date: Jun 2012
Location: Mid Hudson Valley, New York
Posts: 474
Gameroom cash: $274100
Thanks: 21
Thanked 82 Times in 77 Posts
Supreme Member
iTrader Score: 0 reviews
View Fibber2's Photo Gallery
OK, so to start with, you need to see if you are getting hot water to the rear heater core. There is a solenoid control on the water line on top of the rear unit. I've made you a composite of some images I grabbed off the web to get you started on the disassembly process:



Here's a drawing with some landmarks:



Fibber2 is offline   Reply With Quote
Old 01-03-2014, 06:13 PM   #13 (permalink)
Official TN Member
 
Join Date: Jun 2012
Location: Mid Hudson Valley, New York
Posts: 474
Gameroom cash: $274100
Thanks: 21
Thanked 82 Times in 77 Posts
Supreme Member
iTrader Score: 0 reviews
View Fibber2's Photo Gallery
Service manual instructions are pretty scant. You may be looking at a physical clog in the lines, a bad solenoid, or an electrical control issue. Do you see the control arm move when you work the panel knob? Can you move it manually? You can manually turn on the valve using a 12v jumper.

Fibber2 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Truck, SUV and Van Forums > Sienna Forum > 2nd Generation (2004-2010)

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 02:44 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
ToyotaNation.com is an independent Toyota/Lexus enthusiast website. ToyotaNation.com is not sponsored by or in any way affiliated with Toyota Motor Sales, USA, Inc. The Toyota, Lexus and Scion names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.