Air conditiner cools on right side but not on left side

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This is likely due to a faulty AC/Heater air temperature control blend door or its electric actuator or both. It takes a trained HVAC technician to decide which exactly. The blend door is located inside the air ducting and in most cases requires the dash assembly to be removed to access it for replacement and is a VERY EXPENSIVE repair. Please have my guess confirmed before attempting any repairs.
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