VW Touran AC Dead: Relay vs Refrigerant Guide

Had the same issue with my 2016 VW Tiguan 1.4 TSI. The symptoms matched exactly, no response from the AC button and complete system shutdown. After inspection, it turned out to be a combination of problems. The main culprit was a failing pressure switch that prevented the system from activating, a safety feature when refrigerant pressure drops too low. Testing revealed a slow refrigerant leak from one of the condenser valves. The leak allowed moisture to enter the system, which caused internal corrosion. The repair required: System pressure testing to locate the refrigerant leak, Replacement of faulty pressure switch, Condenser valve replacement, Complete system evacuation and recharge, New receiver drier installation This was a serious repair as moisture in the AC system can lead to compressor failure if left untreated. The cooling system needed to be fully cleaned to prevent future issues. Before visiting a shop, check if: The AC compressor clutch engages when the button is pressed, Any unusual AC noise occurred before failure, The temperature control and fan still work normally These symptoms help diagnose whether its a electrical issue or a refrigerant-related problem.

Thanks for sharing your experience. Its interesting how the pressure switch was the main problem in your case. Im still dealing with my AC issues, the blower motor works fine but nothing happens when pressing the AC button, very similar to what you described. Im thinking about getting it checked soon since summer is approaching. The AC diagnostics would probably reveal if its also a refrigerant leak in my case. Your detailed repair list is really helpful for knowing what to expect. Could you remember roughly how much you ended up paying for the complete fix? Also, has everything been working properly since the repair or have you noticed any other AC-related problems?

Glad to help with the AC maintenance details. After getting it fixed, the AC efficiency returned to normal and has been working flawlessly for over a year now. The total repair cost came to 1000€, which covered fixing the defective valves in the air conditioning system. The investment was worth it since the problem was caught before it could damage the compressor. Having a properly working AC not only keeps the car comfortable but also helps maintain its value. The refrigerant leak could have caused more extensive damage if left unchecked. Considering your similar symptoms with the AC button not responding, it sounds like you could be facing the same underlying issue. Getting it diagnosed soon would be smart to avoid potential system-wide problems, especially with warmer weather coming up.

Wanted to update everyone, finally got my AC fixed last week. After putting it off for a while, I decided to try a different repair shop that specializes in AC systems. Really glad I made that choice. Turns out it was indeed a pressure switch problem combined with low refrigerant. The technician found a small leak near the compressor that was causing the system to shut down. The AC relay was also showing signs of wear and needed replacement. Total cost came to 750€, less than expected after seeing some other repair stories. The whole process took about 4 hours including: Leak detection test, Pressure switch replacement, New AC relay, System recharge with fresh refrigerant The cooling system is working perfectly now. The AC kicks in immediately when pressed and blows properly cold air. Much better experience than my previous mechanic visits. Should have done this sooner instead of waiting and worrying about potential costs.