For some reason, the temperature control on the passenger side does not seem to have any effect. Regardless of the setting, max heat, or coldest position, the vents blow out cold. The position selector works fine, and will change the airflow on both sides from foot well to defroster duct. Even the air exiting the right defroster duct is cold, while the driver's side is hot. Is this most likely an electrical or mechanical problem? I have not seen any trouble code flashing on the a/c panel.
Thanks for any suggestions!
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