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Toyota Sienna Heating / Cooling

93 messages,  Last post on Nov 16, 2009 at 4:07 PM

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#63 of 93 Re: 2005 Sienna, Can not turn on AC [kharding] by mfc3 Aug 21, 2008 (8:32 am)
Replying to: kharding (Aug 21, 2008 7:37 am) Thanks, kharding. I will go back to check if the fan is actually working. I did recall the rear AC fan is woring. Do they(rear and front AC) share the same relay ?
#64 of 93 Re: 2005 Sienna, Can not turn on AC [kharding] by mfc3 Aug 21, 2008 (7:05 pm)
Replying to: kharding (Aug 21, 2008 7:37 am) I finally found out it is a bad AC HTR relay. Therefore I decided to find out what is wrong inside the relay. I removed the blue cover from the relay, located the coil and feed them with 12VDC, measured the resistance between two bigest pins. It was 1K-3K ohms, too high to allow AC to work. Later I cleaned the two relay contacts, adjusted the contact postion, and measured the resistance. The contact now has near 0 ohms. Put the relay back and the AC works without any problem. It saves me $20 without getting a new one.   I think the relay was made with poor quality. Once a while it must be changed. Too bad for a Toyota quality.
#65 of 93 Re: 2005 Sienna, Can not turn on AC [mfc3] by cxu Oct 10, 2008 (12:30 pm)
Replying to: mfc3 (Aug 20, 2008 8:22 pm) I have similar issues for 2005 Sienna model with very low mileage. I think this is the Toyota quality issue and we should complain and get free repair. Replies to this message: mfc3 (Oct 10, 2008 12:41 pm) cxu (Oct 11, 2008 5:42 pm) mfc3 (Oct 11, 2008 9:36 pm)
#66 of 93 Re: 2005 Sienna, Can not turn on AC [cxu] by mfc3 Oct 10, 2008 (12:41 pm)
Replying to: cxu (Oct 10, 2008 12:30 pm) I believe so. But for now, there are not much you can do. Once a while, you need to remove the relay for cleaning. It is like changing oil every 6K miles. Replies to this message: cxu (Oct 11, 2008 5:42 pm) mfc3 (Oct 11, 2008 9:36 pm)
#67 of 93 Re: 2005 Sienna, Can not turn on AC [mfc3] by cxu Oct 11, 2008 (5:42 pm)
Replying to: mfc3 (Oct 10, 2008 12:41 pm) Hi, MFC3   How can I remove the HTR relay from the fusebox. I already located the fuse box and also identify the HTR relay box (it has grey color cover, not the blue color). How can I remove this relay out of fuse box. I try to pull it out. I can not.   Thanks Replies to this message: mfc3 (Oct 11, 2008 9:36 pm)
#68 of 93 Re: 2005 Sienna, Can not turn on AC [cxu] by mfc3 Oct 11, 2008 (9:36 pm)
Replying to: cxu (Oct 11, 2008 5:42 pm) The HTR relay is holding very tight. You need to push or pull very hard to get it out. Try to remove other relays nearby to get easy acess to the HTR.
#69 of 93 Re: Problem with rear temp control [stephr] by cpong Feb 24, 2009 (7:21 am)
Replying to: stephr (Jan 10, 2008 6:13 pm) I have the exact same problem. Is it repairable? My dealership also told me that's how it suppose to work. Replies to this message: mfc3 (Feb 28, 2009 1:46 pm)
#70 of 93 Re: Problem with rear temp control [cpong] by mfc3 Feb 28, 2009 (1:46 pm)
Replying to: cpong (Feb 24, 2009 7:21 am) It is repairable but you need to know hot to do it right. If you do not have any idea about electronics, you should buy a new relay instead.
#71 of 93 Re: 2004 Toyota Sienna drivers-side heat blowing cold? [randster] by jeffj2 Mar 04, 2009 (4:54 pm)
Replying to: randster (Jan 04, 2008 11:18 pm) I had the same issue with my 2004 Sienna (and notice that it is flagged now in consumer reports for this model/year). After initial warmup, cold air comes out. Normal temp is set at 70. I have to push driver side to 74-76 to keep having warm air come out. Also, I have to lower rear temperature to 67, since that is pumping out in overdrive.   I also took to dealer and could find no problems with the "heat". I will reference the solar sensor and climate control next time I go.   Thanks for the tips.
#72 of 93 Cooling Temp Output Front/Rear by gedgoudasl Apr 11, 2009 (7:26 am)
Has anyone checked the temperature output of the AC comparing front to rear? My front will go to 37-40 degrees with the rear staying around 50 degrees. Checked with a digital probe or analog "stick" meter. Upon occasion the rear AC puts out heat only while the front is cooling properly. The heating occurs with the rear in max cold setting. Anyone ever have this problem. Heating is intermittent so dealer cannot find it. What are your temperature differentials? This is on a 2008 Sienna XLS. Thanks. Replies to this message: adiehl13 (Apr 15, 2009 11:42 am) gedgoudasl (Apr 15, 2009 2:10 pm) yatesjo (Apr 16, 2009 10:53 pm) gedgoudasl (Apr 17, 2009 12:57 pm) wwest (Apr 17, 2009 8:50 am)

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