Why does my Audi A6's air conditioning keep blowing warm air?

My Audi A6's air conditioning used to work fine, but now it only blows warm air. What could be causing this issue?

Ensure that your air conditioning system is properly charged with refrigerant. Low refrigerant levels can cause your A6's air conditioning to blow warm air.

Check your air conditioning compressor for any damage or leaks. If there are any issues with the compressor, it can lead to warm air blowing from the vents.

Consider getting your A6's air conditioning system flushed and refilled with fresh refrigerant. Over time, dirt and debris can accumulate in the system, leading to reduced cooling performance.