Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> General Servicing >> Air Conditioning >> 87 Air Conditioning >> Refrigerant Circuit >> Expansion Valve, Removing And Installing >> Refrigerant Lines, Disconnecting From Front Expansion Valve And Reconnecting >> Tightening Specifications