Automotive Service Excellence (ASE) Air Conditioner Certification Practice Exam 2026 - Free ASE Air Conditioner Practice Questions and Study Guide

Question: 1 / 400

If a vacuum door actuator is tested and shows a gauge reading of zero while applying vacuum, what does that indicate?

The actuator is defective

The door is binding or obstructed

There is a vacuum leak in the actuator

A gauge reading of zero while applying vacuum suggests that there is a vacuum leak in the actuator. This indicates that the actuator is not able to maintain the vacuum pressure due to a failure in the sealing or structural integrity, which prevents it from working effectively. In a functioning actuator, you would expect to see a change in gauge reading; as vacuum is applied, the pressure should drop, and if the actuator is operational, it would indicate a good seal and proper functioning.

Other factors, such as a binding or obstructed door or an overall defective actuator, may lead to incorrect functionality, but they would not solely explain a gauge reading of zero under vacuum application like a vacuum leak would. If the system were functioning normally, the gauge would reflect a corresponding change in pressure, contrary to what is observed in this scenario.

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The system is functioning normally

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