Automotive Service Excellence (ASE) Air Conditioner Certification Practice Exam 2025 - Free ASE Air Conditioner Practice Questions and Study Guide

Question: 1 / 400

What type of refrigerant is commonly used in most modern automotive A/C systems?

R-12

R-22

R-134a

Modern automotive A/C systems primarily utilize R-134a as the refrigerant. This shift began in the 1990s when it replaced R-12, which was phased out due to environmental concerns related to ozone depletion. R-134a has a significantly lower impact on the ozone layer and is considered a more environmentally friendly option. It operates efficiently in automotive systems, providing effective cooling while being less harmful to the environment.

R-22 and R-410A are primarily used in residential and commercial HVAC systems rather than automotive applications. Their chemical properties and characteristics make them unsuitable for cars, as automotive systems have specific requirements for refrigerant performance. Hence, R-134a stands out as the most appropriate and commonly used refrigerant in the automotive sector today.

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R-410A

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