MACS 609 Certification Exam 2026/2027: 24 Questions & Answers – HFC-134a, HFO-1234yf, Refrigerant Recovery & EPA Section 609

Prepare for the MACS 609 Certification Exam with this focused set of 24 practice questions and verified answers for 2026/2027. The document covers essential Motor Vehicle Air Conditioning (MVAC) concepts, including HFC-134a and HFO-1234yf refrigerants, refrigerant recovery and recycling, leak detection, evacuation, lubricant handling, refrigerant identification, recovery equipment, service-port sealing, system flushing, refrigerant contamination, safety procedures, and EPA Section 609 requirements. It also addresses PAG lubricant, MSDS information, refrigerant transfer tanks, accumulator-type systems, Section 608 Type II certification in relevant applications, and environmental considerations associated with refrigerants. The material is particularly relevant to students and technicians preparing to demonstrate knowledge of proper MVAC servicing procedures. The U.S. Environmental Protection Agency states that technicians who service or repair motor vehicle air-conditioning systems for compensation must be properly trained and certified under Section 609 of the Clean Air Act, and certification requires passing an EPA-approved examination. EPA guidance also emphasizes proper refrigerant recovery, approved servicing equipment, regulatory requirements, and responsible refrigerant handling. Several questions focus specifically on recovery, recycling, and refrigerant-handling equipment. This aligns with current EPA requirements stating that MVAC technicians must use approved refrigerant-handling equipment. EPA's certified-equipment listings include standards covering HFC-134a and HFO-1234yf recovery, recycling, and recharge equipment, including SAE J2788, J2810, J2843, J2851, and J3030 equipment categories. The document also includes examination material on electronic refrigerant leak detection, including SAE J2791. SAE International's current SAE J2791_202505, HFC-134a Refrigerant Electronic Leak Detectors, Minimum Performance Criteria, establishes testing and functional requirements for electronic probe-type detectors intended to identify smaller refrigerant leaks during MVAC servicing. This provides an authoritative technical reference for one of the important topics represented in the question set. This resource is therefore suitable for focused revision, self-testing, last-minute exam preparation, and reinforcing practical knowledge of mobile A/C refrigerant servicing. Because the uploaded document does not identify a university or academic institution, no university name can be accurately attributed to it; “Institution Not Specified” is used rather than inventing an affiliation. Relevant Students This document is relevant for MACS 609 certification candidates, automotive technology students, automotive HVAC students, vehicle air-conditioning trainees, automotive service technician students, vocational and technical college students, apprentice automotive technicians, practicing mechanics seeking Section 609 certification, and technicians reviewing EPA-compliant MVAC refrigerant handling procedures. References U.S. Environmental Protection Agency (EPA). Section 609 Technician Training and Certification Programs. EPA guidance on certification and training requirements for technicians servicing motor vehicle air-conditioning systems. U.S. Environmental Protection Agency (EPA). Regulatory Requirements for MVAC System Servicing. Guidance covering technician certification, refrigerant recovery/reuse, and approved servicing equipment. SAE International. SAE J2791_202505: HFC-134a Refrigerant Electronic Leak Detectors, Minimum Performance Criteria. Revised May 16, 2025. DOI: 10.4271/J2791_202505. Keywords MACS 609 exam questions, MACS 609 certification answers, Section 609 certification exam, 2026 MACS 609 exam, 2027 MACS 609 exam, EPA Section 609, mobile air conditioning certification, MVAC certification, automotive AC certification, automotive HVAC exam, HFC-134a questions, HFO-1234yf questions, refrigerant recovery, refrigerant recycling, refrigerant leak detection, SAE J2791, PAG lubricant, refrigerant evacuation, refrigerant identification, recovery recycling equipment, automotive refrigerant safety, EPA refrigerant regulations, mobile AC practice questions, Section 609 practice test, automotive technician certification