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sprinkles08, ASE Certified Technician
Category: Toyota
Satisfied Customers: 22687
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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06 sienna passenger vents does not blow hot air in heat

Customer Question

Customer: 06 sienna passenger vents does not blow hot air in heat mode. problem occurred after having belts replaced, coincidence? ***** *****
JA: Thanks. Can you give me any more details about your issue?
Customer: Fan works on all speeds. vents work in any direction,defrost,floor,etc. passenger vents will only blow cold air,no heat.Driver side and rear vents work perfect in ac mode and heat mode.
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Submitted: 1 year ago.
Category: Toyota
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

Yes, it's a coincidence that the problem started after having the belt replaced.

You may have a blend door issue, either the door itself or a failed actuator, or it may be the heater core itself.

If you have a single zone system then there is a single blend door that controls temperature on both sides. A difference in temperature would almost surely be a restricted heater core.

If you have a dual zone system then there is a separate blend door and actuator for each side. If you completely lost control of temperature on one side with a dual zone system then you most likely have a broken door or failed actuator.

Customer: replied 1 year ago.
Extremely helpful! Thanks.
Expert:  sprinkles08 replied 1 year ago.

You're welcome!