2004 Sienna Rear Heat Not Working - Toyota Nation Forum : Toyota Car and Truck Forums
2nd Generation (2004-2010) Discussion area for the second generation Toyota Sienna.

 
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#1 Old 11-24-2009, 08:57 PM
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USA 2004 Sienna Rear Heat Not Working

Any ideas?

Front heat works fine, the rear heat blows cold...
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#2 Old 11-25-2009, 09:01 AM
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Check your coolant level and if you need to add, do it when the car is cold and use the same brand/quality that it's already used in your car. Beware of not creating air pockets inside the system.
I had the same problem and it fixed mine.
Hope this helps.

Last edited by toyotoyo; 11-25-2009 at 09:06 AM. Reason: ac1
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#3 Old 11-29-2009, 06:07 AM
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Well the reservoir was completely empty, Just topped off last night and I know noticed that its been either leaking out/boiling out overnight, maybe about a cups worth in the garage..

What now? (thanks by the way)
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#4 Old 12-07-2009, 04:11 AM
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Canada

I do have the same issue, checked coolant level which is ok. What else to check?
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#5 Old 12-13-2009, 02:31 PM
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the coolant pipes that run heat to the rear are ran on the inside bottom of van along wall and cool off the coolant befofe it reaches rear, I have 04 as well in canada and my buddy a tech at toyota 20 yrs and ex[lplained this to me . 04 was only problem year, after that they re routed pipes,. it cant be fixed, but when you accelerate it should send warm air to the back as well from rear heater.But take foot off gas or when stopped its cooler,.
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