Notes On Retrofitting An Air Conditioning System - AH83.30-P-0001-02A
WARNING: This page is about a different car, the 2023 Mercedes-Benz GLC300, 2022 Mercedes-Benz GLC300, 2021 Mercedes-Benz GLC300, 2020 Mercedes-Benz GLC350e, and 2020 Mercedes-Benz GLC300. However, it is still accessible from the selected car via links, so may be relevant.
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Do not remove the plugs on any of the components until immediately prior to installation.
Fit all AC lines with new sealing rings. Coat thread and sealing rings with compressor oil.