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Poor air flow through defroster vents

\015 I have good air flow to floor vents and good air flow to dash vents. When I switch to defrost I have good air flow to side window vents,but poor flow through defrost vents. The door actuator has full movement to both stops. I do hear a whistle noise when on full defrost mode. Do the side window vents and the defrost vents have a door between them?\015 Posted / edited by AnonymousUser on : 29-06-2020

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