Active Grille Shutter Problems Diagnose and fix active grille shutter problems What the active grille shutter does The main job of the active grille shutter is to reduce aerodynamic vehicle drag and increase MPG during periods when engine cabin cooling loads are low and high airflow through the condenser and radiator are not required. During those periods, the shutters are closed If the ECM determines that high airflow is required it will open one or both of the shutters. It determines active grille shutter position based on inputs from the … Read More
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