R-1234yf
A modern, environmentally friendly A/C refrigerant with low global warming potential, used in most vehicles manufactured after 2018.
R-1234yf is a hydrofluoroolefin (HFO) chemical compound used as the standard refrigerant in modern automotive air conditioning systems. Developed to replace R-134a, R-1234yf has a global warming potential (GWP) of less than 1, compared to R-134a's GWP of 1,430. It breaks down much faster in the atmosphere, making it significantly more environmentally friendly and compliant with global climate regulations.
While R-1234yf operates at similar pressures and temperatures to R-134a, the two refrigerants cannot be mixed, and their systems use different service ports to prevent accidental cross-contamination. R-1234yf is mildly flammable under specific conditions, which requires A/C service machines to have built-in leak check and spark-free designs. The cost of R-1234yf is also significantly higher than older refrigerants, making A/C repairs on newer vehicles more expensive.
Symptoms of low refrigerant or leaks in an R-1234yf system include warm air blowing from the vents, the A/C compressor failing to engage, and rapid cycling of the A/C clutch. Servicing these systems requires specialized recovery and recharge equipment designed specifically for R-1234yf. Finding leaks typically involves using electronic leak detectors or injecting UV dye into the A/C lines.