Automotive Service Excellence (ASE) Air Conditioner Certification 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which refrigerant is commonly used in modern automotive A/C systems?

R-12

R-22

R-134a

Modern automotive air conditioning systems predominantly use R-134a as their refrigerant. This compound was widely adopted after the phase-out of R-12, which was found to be harmful to the ozone layer. R-134a, on the other hand, has a much lower ozone depletion potential, making it a more environmentally friendly option.

In addition to being more eco-friendly, R-134a demonstrates good thermodynamic properties, which allow it to efficiently absorb and release heat—key requirements for effective air conditioning performance in vehicles. This refrigerant became the standard for cars produced from the mid-1990s onward and continues to be utilized, as many modern cars were designed to operate with R-134a in mind.

Other refrigerants such as R-22 and R-410A are typically used in residential and commercial HVAC systems rather than in automotive applications, further establishing R-134a as the correct choice for modern vehicles.

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R-410A

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