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Q: heater on 2007 Buick Lucerne

No heat on passenger side 2007 Buick lucerne.
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I have a lucerne with the same problem but its a manual system and only consists of one door and one temperature actuator. A gm rep said to change the heater core which was weird to me but I cant see the problem being the actuator as it is doing its job if the driver side is getting hot air
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