2007 Toyota Sienna - No heat

My van rear ac/ and heater is not working right. The rear air is blowing BUT WHEN I put it on the heater it come’s out cold not hot . what can it be ?

Air bubble in the system maybe.

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Blend door not working right ?

Well , after 9 months I would hope Louie has had the problem fixed.

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You never know, we have had questions from people with a CEL on for many months prior to posting.