What refrigerant is used in car air conditioning?

[HopeAnn]

Car air conditioning uses R134a refrigerant, which is a relatively environmentally friendly refrigerant. Air conditioning works by utilizing the transformation of refrigerant between different states to achieve cooling. When the car air conditioning is in cooling mode, the engine drives the compressor to operate. At this time, the compressor continuously compresses the refrigerant and delivers it to the evaporator. Heating in the air conditioning system does not require refrigerant, nor does it need the compressor or evaporator. There is a component in the air conditioning system called the heater core, which is a heat exchanger. During heating, the high-temperature coolant from the engine flows through the heater core, and the air blown by the blower also passes through the core, allowing the air conditioning to blow warm air.

[JocelynRose]

The most common automotive air conditioning refrigerant on the market today is basically the R134a model. This stuff doesn't damage the ozone layer and has been used for many years. When my old 2012 Camry needed refrigerant replacement, the mechanic added this exact type - there's even a small label marking it on the service port. However, newer vehicles are now switching to the more environmentally friendly R1234yf, especially European cars manufactured after 2018, mainly to comply with EU environmental standards. It's crucial to note that different refrigerants must never be mixed, as their system pressure values vary and mixing can damage the compressor. For those driving vintage cars, special attention is required - vehicles from before the 1990s might still be using the obsolete R12 refrigerant, which is basically impossible to find genuine products for nowadays.

[McMichael]

Refrigerant is quite a particular thing. Nowadays, there are mainly two types in the mainstream. New cars like Mercedes-Benz and BMW have basically switched to R1234yf eco-friendly refrigerant, which has a global warming potential 99% lower than traditional types. However, most cars on the road still use R134a, as the new standard only started to be gradually adopted in 2017. The other day, I made a fool of myself when refilling the refrigerant for my old car - the new refrigerant connector specifications didn't match the old model, so I had to make two unnecessary trips to the auto parts market. My advice is to have the mechanic check the air conditioning system's sealing during every maintenance service. Refrigerant leakage not only affects cooling performance but is also bad for the environment.

[JudeLynn]

The choice of air conditioning refrigerant depends on the vehicle's age. For ordinary family cars produced in the last decade, R134a is commonly used with a pressure around 3 bar for optimal cooling. However, during repairs, I've noticed an increasing number of post-2019 vehicles using R1234yf, especially hybrid models with auto start-stop systems. According to factory trainers, the formulations of both refrigerants and compressor oils differ between old and new types, requiring thorough pipeline cleaning during maintenance. When my decade-old SUV was last recharged, the technician first spent ten minutes checking for leaks with a UV detector before proceeding.