Refrigerant Types and Safety
R134a vs R1234yf, oils, and the safety rules that protect you and the system.
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Safety notice
- Refrigerants must never be mixed and the wrong type or oil can damage the system and equipment. R1234yf can form a flammable mixture; follow the manufacturer and equipment procedures, and never vent refrigerant to atmosphere.
What you will learn
- Identify common refrigerants
- Explain oil compatibility
- Follow refrigerant safety rules
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Vehicles use different refrigerants by age and market. R134a and the newer R1234yf are not interchangeable, and each system uses a specific oil (for example PAG oil matched to the refrigerant). Mixing refrigerants or oils causes poor performance and compressor damage.
R1234yf is mildly flammable under certain conditions, which is why recovery equipment and procedures differ. Always identify the refrigerant from the vehicle data, use the correct machine and follow the manufacturer instructions.
| Refrigerant | Notes |
|---|---|
| R134a | Common on older vehicles; specific PAG oil |
| R1234yf | Newer vehicles; mildly flammable; dedicated equipment |
| Oil | Must match the refrigerant; wrong oil damages the compressor |
R1234yf can form a flammable mixture — no open flames, no smoking, use approved recovery equipment and follow the manufacturer procedure.
Key points
- Never mix refrigerants or oils.
- Identify the refrigerant from the vehicle data.
- Use the correct equipment and procedure for each type.
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Key points
- Refrigerants are not interchangeable
- The wrong oil damages the compressor
- R1234yf is flammable under certain conditions
All values shown are training examples. Real thresholds depend on the manufacturer, engine, temperature and system — always confirm with the vehicle service documentation.
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