Working On The Refrigerant Circuit
WARNING: This page is about a different car, the 2025 Audi A4 allroad and 2025 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
- The refrigerant oil is hygroscopic, which means it absorbs moisture from the surrounding air. If the refrigerant circuit has been opened for a longer period of time, the refrigerant oil and the drying element will be saturated with moisture. Before charging the refrigerant circuit, evacuate it thoroughly and replace the drying element.
- Welding and soldering work near components of the A/C system may only be performed with the refrigerant circuit drained.
- It is possible to destroy the refrigerant lines due to tears in the inner foil. Never bend refrigerant lines to a radius of less than r = 10 cm.
North American Region (NAR):
- Replace faulty components with original parts.
- Evaporators must meet the SAE standards applicable to the vehicle.