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Toyota Sienna Heating / Cooling

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

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#53 of 93 Re: '05 Sienna A/C quit working completely [kharding] by relooky01 Jul 07, 2008 (12:47 pm)
Replying to: kharding (Jul 07, 2008 10:35 am) I replaced the HTR relay on Saturday and so far the blower is working fine. Once the blower came on I did not have a problem with the A/C going off at a higher speed setting as you mentioned. Once it came on it worked just fine at all speeds. By the way, I was able to remove the cover from the old relay by prying it over the 4 tabs. I connected the relay to a 12 volt power supply and measured the resistance across the closed contacts (the two large terminals on the relay). The resistance varied each time I energized the relay. I then polished the contacts with some real fine crocus cloth followed by a strip of heavy paper (from a business card). The resistance across the contacts was essentially zero after that with the relay energized and the relay worked fine. Although I did not try it back in the car I have every reason to believe it would work as good as new. As a suggestion, try swapping the HTR and the RR A/C relays (they are located next to each other) and see if the intermittent problem moves to the rear heater blower. Good luck! Replies to this message: muddyazian (Jul 08, 2008 5:47 pm) kharding (Jul 09, 2008 8:09 am) jimox (Apr 20, 2009 9:00 pm) lee104 (Nov 06, 2009 7:32 am)
#54 of 93 Re: '05 Sienna A/C quit working completely [relooky01] by muddyazian Jul 08, 2008 (5:47 pm)
Replying to: relooky01 (Jul 07, 2008 12:47 pm) We have the same problem in our '06 Sienna. We brought it to the dealership, but they couldn't figure out what was wrong - we should have checked this forum first. How do you remove the HTR relay? If you just pull hard enough, will the relay pop off? Do you need to pry the relay off with a tool? Do you remove the blue cover? Thanks. Replies to this message: kharding (Jul 09, 2008 8:09 am) jimox (Apr 20, 2009 9:00 pm) lee104 (Nov 06, 2009 7:32 am)
#55 of 93 Re: '05 Sienna A/C quit working completely [muddyazian] by kharding Jul 09, 2008 (8:09 am)
Replying to: muddyazian (Jul 08, 2008 5:47 pm) To remove the HTR relay, you open up the fuse box under the hood near the driver's side, pop off the fuse box cover and then find the appropriate relay. On my '05, the schematic is on the under side of the fuse box cover. You should just pull the relay straight out like a fuse. I would avoid using a tool if at all possible so as not to break anything unless there is a special relay puller tool. The relay is in there tight, but with minimal wiggling, it should pop straight out. These relays cost about $18-20. I just switched out the RR A/C with the HTR relay and now we are dealing with the intermittent issue in the rear air. I will pick up another when convenient, but at least I know that this was the problem. I do not think the blue cover on the relay itself is removable. Good luck Replies to this message: jimox (Apr 20, 2009 9:00 pm) lee104 (Nov 06, 2009 7:32 am)
#56 of 93 05 Sienna A/C blows smoke/vapor by xavy Jul 17, 2008 (1:41 pm)
Just purchased used 05 Sienna (50K) two months ago, wife noticed odorless vapor/smoke blowing out of center dash vent today. Has anyone ever encounter this before? What is the cause? Dealer wants us to bring in because they say they have never seen or heard of this issue. Are they just blowing smoke? Thanks Replies to this message: wwest (Jul 18, 2008 9:11 am)
#57 of 93 05 Sienna transponder key by xavy Jul 17, 2008 (1:45 pm)
I purchased an OEM key today, and had locksmith cut key, no problem. Went to program myself, followed instruction, did not work. Any suggestions other than paying dealer $89.00 an hour for a 2 min. job? Thieves is the common word for them. Thanks
#58 of 93 Re: 05 Sienna A/C blows smoke/vapor [xavy] by wwest Jul 18, 2008 (9:11 am)
Replying to: xavy (Jul 17, 2008 1:41 pm) Fog.....!!   Humid day, A/C cools the air to dewpoint, you get FOG flowing out of the vents. Usually only lasts until the A/C is able to fully cool the evaporator down.
#59 of 93 2005 Toyota Sienna, Long time to wait for heat. by marty08 Aug 01, 2008 (4:08 pm)
I bought the Sienna in the Fall and when Winter came, we noticed that it takes over 20 minutes to get any considerable heat from the vents. If you let the vehicle in "Park", warming it up, it takes over 25 minutes to get any heat. When you drive it, within a minute of start-up, it is usually 20 minutes or 7 miles, before you get any heat. I've taken it into the dealership, under warranty and they stick the radiator and say it's OK. I tried to make them keep it overnight and start it in the morning, when it's cold and they claim that if it's at the correct operating temperature when they check it, it won't make a difference. I tried to explain that perhaps the thermostat is not closing all the way and the dealership stated that they have never heard of this. Has anyone else had this problem? I have a 97 4-Runner and a 90 Toyota Pick-up and both warm up within a few minutes and even the temperature guage goes to normal, just warming it up without driving it. Replies to this message: wwest (Aug 02, 2008 9:30 am)
#60 of 93 Re: 2005 Toyota Sienna, Long time to wait for heat. [marty08] by wwest Aug 02, 2008 (9:30 am)
Replying to: marty08 (Aug 01, 2008 4:08 pm) Does the engine coolant temperature guage come up to the correct level in the normal time and yet there is no heat..??   Or does the engine coolant not come up to temperature..??
#61 of 93 2005 Sienna, Can not turn on AC by mfc3 Aug 20, 2008 (8:22 pm)
I have 2005 Sienna with only 10K miles. Now I press AC on/off switch and nothing happens. The AC switch light is always off. The air blows do work but they are just sucking air from outside. Does anyone know what is going on ? Where should I look for ? The car warranty just expired. Replies to this message: kharding (Aug 21, 2008 7:37 am) mfc3 (Aug 21, 2008 8:32 am) mfc3 (Aug 21, 2008 7:05 pm) cxu (Oct 10, 2008 12:30 pm) mfc3 (Oct 10, 2008 12:41 pm) cxu (Oct 11, 2008 5:42 pm) and 1 more...
#62 of 93 Re: 2005 Sienna, Can not turn on AC [mfc3] by kharding Aug 21, 2008 (7:37 am)
Replying to: mfc3 (Aug 20, 2008 8:22 pm) I had a similar issue with the switch in the on position, no A/C light, and no fan was functioning. I switched out the A/C relay in the fuse box and that seemed to fix it. I have not dealt with a fan that is working but A/C not working. Sorry. Replies to this message: mfc3 (Aug 21, 2008 8:32 am) mfc3 (Aug 21, 2008 7:05 pm)

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