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Why would me rear air conditioner work and not in front vents of a 1999 gmc Yukon?
Wiki User
∙ 15y ago
Mine did something the same. Above the transmission hump just to right of accelerator, there is a servo motor connected to a plastic and metal slide mechanism which selects where airflow is directed. Likely that slide or servo motor has let go.
Wiki User
∙ 15y ago
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