May 22, 2015 Service bulletin

Tech tip: buzzing noise from dash symptom: buzzing noise coming from dash area

Kia technical service bulletin TT065 for 2011-2012 Kia Optima.

Bulletin number: TT065
Component: Visibility: defroster/defogger/HVAC system
Summary: "tech tip: buzzing noise from dash symptom: buzzing noise coming from dash area. Repair: operate the air-temp controls or the vent air position control setting. If the noise stops after adjusting the controls, the noise may be caused by a faulty air temp actuator or air vent position actuator. To resolve this concern, identify which blend actuator is the source of the noise (see image) and replace it."

Owners of these vehicles have filed 39 complaints in the visibility category.

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