Touareg AC System Dead: From Cooling to Complete Failure

Having experienced a similar AC failure on my 2020 VW Atlas, I can relate to this cooling system problem. The symptoms turned out to be more than a simple refrigerant leak. The initial diagnosis revealed a faulty pressure switch causing the AC system to shut down completely. When tested, the temperature control module showed no response, similar to your situation where pressing the AC button had no effect. After thorough diagnostics, the root cause was traced to defective expansion valves in the AC system. This is a serious issue that requires professional attention, as these valves control refrigerant flow throughout the entire cooling system. The repair involved: Complete system diagnosis, Replacement of expansion valves, System evacuation and recharge, Testing of all AC components, Verification of proper pressure readings This repair took 2 full days at the shop. While waiting for parts was frustrating, rushing the repair would have risked further damage to the cooling system. A proper fix prevents recurring issues and protects other AC components from failure. The AC noise after repair was noticeably quieter, confirming the valves were indeed the problem. Recommend having a certified AC specialist perform a full system diagnosis rather than assuming its just a refrigerant leak.

Thanks for sharing your experience with the expansion valve issue. That sounds exactly like what I am dealing with on my Touareg. After reading your detailed explanation, I am convinced I need to take it to a certified shop for proper AC diagnostics. Would you mind sharing how much the total repair cost in your case? Also curious if you have had any issues with the AC system since the repair was completed? The AC relay and other components might need checking in my case too.

After getting my Atlas fixed by a certified shop, I can confirm the AC system has been working flawlessly for months now. The repair cost came to 1000€ for replacing the defective valves in the air conditioning system. This included a thorough AC maintenance check and testing of all components. The temperature control is now perfect and the blower motor runs much quieter than before. The shop also verified there were no additional refrigerant leaks or other issues affecting AC efficiency. This comprehensive fix was worth the investment compared to temporary solutions that might have led to bigger problems. I would definitely recommend having your Touareg checked by certified specialists who can properly diagnose the full extent of the AC system issues. While the initial cost might seem high, proper repairs with quality parts will ensure reliable cooling performance long-term.

Thanks for the helpful advice. I finally got my Touareg fixed last week and wanted to share my experience. Took it to a certified VW specialist who properly diagnosed the AC system. The blower motor and AC relay were both functioning correctly, but they found a failed pressure switch that was preventing the system from engaging. The cooling system inspection revealed the expansion valve was indeed failing, just as suggested. Total repair cost came to 850€ including parts and labor. The shop did a thorough job testing the temperature control and all AC components after the repair. Been driving for a week now and the AC works perfectly, nice cold air and much quieter operation than before. Really glad I went with a proper diagnosis rather than just hoping it was a simple refrigerant leak. Sometimes paying more upfront for quality work saves money in the long run.