A2 AC System Dead: Blower Works, No Cold Air Output

Had almost the same issue with my 2002 Audi A3, and being somewhat experienced with AC systems, I first suspected a refrigerant leak. After monitoring the system, it turned out to be more complex. The workshop diagnosed defective control valves in the AC system. The problem showed similar symptoms, the blower motor worked fine, pushing air through vents, but no cooling function. The system needed new control valves plus a complete refrigerant recharge after fixing the faulty components. Total repair cost was 1000 Euro, including parts, labor, and the new refrigerant charge. The fix took about 6 hours at the workshop. Since then, the AC has worked flawlessly. Before suggesting specific solutions, could you share: Any unusual AC noise before the system stopped working? Did the cooling gradually decrease or stop suddenly? Are there any warning lights on the dashboard? Have you had any recent AC service or refrigerant recharge? These details would help determine if your issue is similar to what I experienced with my A3. The cooling system in these models can be tricky, but usually fixable with proper diagnosis.

Thanks for the detailed response. Last service was just 300km ago, currently at 8006km. No warning lights or strange noises before the AC stopped working, it just failed suddenly during a drive. The AC diagnostics you mentioned for your A3 sound similar to my symptoms. Will get it checked by a specialist since the previous service didnt include any AC system inspection. Were there any early warning signs I should watch for in the future to prevent complete failure?

Your question about early warning signs is important. After my A3 was fixed, I learned several key indicators that can help catch AC issues early. The most noticeable pre-failure sign in these models is inconsistent cooling, where the AC efficiency fluctuates even when settings remain unchanged. The AC relay might also make subtle clicking sounds when switching between temperature settings, which can indicate early control valve problems. My mechanic explained that monitoring these symptoms helps with preventive maintenance: Reduced airflow from vents, Intermittent cooling, Unusual AC noise when switching modes, Moisture under the vehicle, Longer time needed to reach desired temperature Since your A2 shares similar AC components with my A3, I recommend having the AC diagnostics done annually, even if everything seems fine. This helped me avoid another complete system failure after the initial repair. The sudden failure you experienced matches exactly what happened to my control valves. The temperature control system can appear perfect until components completely fail. Regular checks of the AC relay and control valve function during routine maintenance could catch these issues before total failure occurs.

Thanks for the helpful information about warning signs. After hearing about your experience, I definitely understand my AC situation better now. Makes sense about the control valves since my AC also stopped so suddenly. I called a local AC specialist and booked the car in next week for diagnostics. The shop mentioned they'll start by checking the pressure switch and control valves before doing a full AC diagnostics workup. Good to know the repair cost might be around 1000 Euro if it turns out to be the same issue you had. Going forward, I'll keep an eye out for those early warning signs you mentioned, especially any strange AC noise or cooling inconsistencies. Will also make sure to get the cooling system checked during regular services rather than waiting for problems. Really appreciate you sharing your experience, it helped me understand what steps to take next to get this fixed properly. Would be grateful if you could update this thread once I get the diagnosis back from the shop, in case it helps others with similar AC issues in these models.