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

A failing A/C compressor often manifests through unusual noises such as clattering or grinding. These sounds can be indicative of internal wear or damage within the compressor. As the components inside the compressor begin to fail, they may not operate smoothly, leading to symptoms like these noises. These sounds can be concerning and often suggest that the compressor may need to be inspected more closely or replaced to restore proper A/C function.

The other options do not align with the typical symptoms associated with a failing A/C compressor. Increased fuel efficiency is not a symptom of compressor failure; in fact, a malfunctioning compressor can increase engine load and potentially decrease fuel efficiency. Improved air pressure in the cabin would not occur if the compressor is failing, as the cooling process relies on the compressor to circulate refrigerant properly. Lastly, constant cold air output suggests that the air conditioning system is functioning properly, which would not be the case if the compressor were failing.