Refrigerant Circuit, Discharging
Refrigerant must never be drained out into the surrounding environment, but rather it is to be extracted from the refrigerant circuit using an A/C service station. The drained refrigerant is either recycled on site or is sent back to the manufacturer for eco-friendly disposal. Different or additional regulations may apply in other countries. For this reason and if necessary, bring the vehicle to a workshop that has the necessary tools and in which the work can be performed by qualified personnel. Refer to REFRIGERANT CIRCUIT / REFRIGERANT CIRCUIT (R1234yf) / REFRIGERANT CIRCUIT (R134a) (Refrigerant R134a Servicing; Refrigerant Circuit, Working with A/C Service Station) or LAWS AND REGULATIONS (R1234yf) .
Refrigerant must never be drained out into the surrounding environment, but rather it is to be extracted from the refrigerant circuit using an A/C service station. The drained refrigerant is either recycled on site or is sent back to the manufacturer for eco-friendly disposal. Different or additional regulations may apply in other countries. For this reason and if necessary, bring the vehicle to a workshop that has the necessary tools and in which the work can be performed by qualified personnel. Refer to A/C SYSTEM, GENERAL INFORMATION (R134a) or LAWS AND REGULATIONS (R1234yf) .
Reason:
If refrigerant R134a and refrigerant R1234yf is released into the environment, it enhances the greenhouse effect.
Refrigerant R134a has far less of a greenhouse effect than R12 refrigerant.
Refrigerant R1234yf has far less of a greenhouse effect than R134a refrigerant.
Refrigerant R134a and refrigerant R1234yf do not affect the ozone layer of the Earth's atmosphere (refrigerant R134a and refrigerant R1234yf do not contain chlorine atoms). Depletion of the ozone layer in the upper atmosphere is however only brought about by the splitting of carbon-chlorine bonds (as is the case, for example, with refrigerant R12).
The Global Warming Potential (GWP) of R1234yf is approximately 4, while the GWP of R134a is approximately 1400 (GWP of carbon dioxide = 1). Refer to LAWS AND REGULATIONS (R1234yf) .
After discharging the A/C system disconnect the connector on the A/C Compressor Regulator Valve -N280- (vehicles without a high-voltage system) or on the Refrigerant Circuit Pressure Sensor - G805- (or on the A/C pressure/temperature sensor -G395-, depending on the vehicle version.
Reason:
- The A/C compressor (the A/C Compressor Regulator Valve -N280-) will no longer activate.
- The mechanically driven A/C compressor only runs at idle with the engine. The mechanically driven A/C compressor is designed so the lubrication of the A/C compressor components at idle is guaranteed by an internal oil circuit (as long as there is enough refrigerant oil in the A/C compressor).