A customer complains that air flow shifts from the dash vents to the floor vents during hard acceleration.Technician A says that it could be caused by a misadjusted blend air door.Technician B says this could be caused by a leaking vacuum supplu line.Who is correct? A) Technician A only B) Technician B only C) Both A and B D) Neither A nor B

Question

Quizplus · Accepted Answer

The issue described is typically related to a vacuum problem in the HVAC system, as vacuum is used to control the position of the doors that direct airflow. A leaking vacuum supply line would reduce vacuum pressure, causing the system to default to another position (like the floor vents) during conditions that lower vacuum pressure further, such as hard acceleration. A misadjusted blend air door would affect the temperature of the air, not the direction of airflow.

A Customer Complains That Air Flow Shifts from the Dash