Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI2018A5 QUATTRO PRESTIGE, 2D CONVERTIBLEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 217 (GENERAL, TECHNICAL DATA (REFRIGERANT R1234YF SERVICING))00 GENERAL, TECHNICAL DATATECHNICAL AND PHYSICAL PRINCIPLESPYROTECHNICAL CHARACTERISTICSREFRIGERANT R1234YF PYROTECHNICAL CHARACTERISTICS
2018 Audi A5 Quattro Prestige, 2D Convertible
Refrigerant R1234YF Pyrotechnical Characteristics
2018 Audi A5 Quattro Prestige, 2D ConvertibleSECTION Refrigerant R1234YF Pyrotechnical Characteristics
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- The vapor pressure curves of both refrigerant R1234yf and R134a are very similar across a large temperature range for this reason no differentiation of the two refrigerants is possible. Refer to REFRIGERANT VAPOR PRESSURE TABLE and A/C System, General Information . Distinguishing is only possible by suitable sensors which can analyze the chemical characteristics of the refrigerant. Refer to REFRIGERANT R1234YF ANALYSIS .
- With R1234yf, the A/C compressor is lubricated with special synthetic refrigerant oils, for example PAG oils (polyalkylene glycol oils) which are specified to the refrigerant R1234yf, the A/C compressor and the operating conditions of the specified additions (additives).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.