The invention relates to a service device for exchanging a coolant/compressor-oil mixture in vehicle air-conditioning systems, said device comprising a coolant reservoir (215) and a first separation stage (240) which feeds the coolant reservoir and separates coolant and non-condensable gases from the compressor oil. In said device, the discharge of coolant into the environment is largely prevented by the provision of a second separation stage in the service device, said stage being fed by the coolant reservoir (215) and having an intermediate container (225) for separating the coolant and non-condensable gases.
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