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I have a RAV4 with dual climate control. Currently we have heat coming out of the drivers side but very cold air coming out of the passenger side which makes it very uncomfortable for the passenger in the winter. Ignition is push to start
 

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Look at the threads on the INTERIOR section. Plenty of this stuff there.

Most likely it is a blend door (airmix damper) issue on passengers side. Servo motor or the like is not responding. Do a search.

Next possibility is a bad AC Amplifier - the electronic brain that tells the servo motors what to do.

Lastly is a clogged heater core. Hot water enters/exits on the drivers side, so sediment clogs tend to block the passengers side first.
 
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