Audi A6 air conditioning failure may be caused by insufficient refrigerant, a dirty condenser, or moisture in the pipelines. Below are detailed explanations: Insufficient Refrigerant: Refrigerant loss primarily occurs due to leaks. If the car's air conditioning underperforms and resumes poor performance shortly after refrigerant recharge, attention is required. A relatively simple method to detect leaks involves observing the condenser surface through the grille for oil stains – this typically indicates condenser leakage. Dirty Condenser: During summer when air conditioning problems emerge, 4S shops often recommend radiator cleaning. The purpose of cleaning radiators and condensers is primarily heat dissipation. When cottonwood or willow catkins accumulate on the condenser, it can lead to engine overheating or air conditioning failure. During cleaning, always use compressed air first before water jets; otherwise, the opposite effect may occur, worsening AC performance and increasing fuel consumption. Moisture in Pipelines: The automotive AC system contains a receiver-drier designed to absorb moisture from refrigerant. When the desiccant becomes saturated, moisture can no longer be filtered out. As refrigerant passes through the expansion valve orifice, pressure and temperature drops cause moisture in the refrigerant to freeze at the orifice. This creates blockages, increases flow resistance, and ultimately prevents proper cooling.
