What's the problem with the Audi Q5's air conditioning not cooling after running for half an hour?

[SanAmara]

The reasons why the Audi Q5's air conditioning stops cooling after running for half an hour are as follows: Insufficient or too little refrigerant: A common reason for car air conditioning not cooling is insufficient or too little refrigerant, which is likely due to minor leaks. Solution: You can observe through the sight glass on the top of the dryer. During normal operation of the air conditioning, if there are continuous slow bubbles in the sight glass, it indicates insufficient refrigerant. If obvious bubble flipping occurs, it means the refrigerant is severely insufficient. Excessive refrigerant: Too much refrigerant can also cause the air conditioning not to cool, as the proportion of refrigerant in the air conditioning system is strictly required. If the proportion is too high, it will affect heat dissipation. Similarly, adding too much cooling oil during maintenance can also reduce the heat dissipation of the system. Solution: Observe through the sight glass on the dryer. If no bubbles are seen in the sight glass during operation and none appear after the compressor stops, it definitely indicates excessive refrigerant. If the pressurized cooling oil is excessive, you will see relatively turbid bubbles in the sight glass during normal operation. Loose drive belt of the car air conditioning compressor: Car cooling relies on refrigerant, and refrigerant transmission depends on the air conditioning compressor, with the drive belt being a crucial moving part. If the drive belt is loose, the compressor may slip during operation, reducing transmission efficiency and compressor speed, thereby decreasing refrigerant delivery and causing the air conditioning not to cool. If the compressor drive belt is too loose, it should be tightened. If it cannot be turned by hand, it means the belt is too tight and should be slightly loosened.

[SanVincent]

My Audi Q5's air conditioning stops cooling after running for half an hour, which is really frustrating, especially during long summer drives. It starts off with strong cooling but gradually becomes lukewarm over time. This could be due to insufficient refrigerant or a minor leak, as the air conditioning system consumes refrigerant over prolonged use, similar to how Freon leaks from a refrigerator. Another possibility is that the compressor is overheating or malfunctioning, often caused by a faulty fan or a condenser clogged with dust. When the fan fails to rotate, it can lead to system overheating and shutdown. Additionally, a dirty air filter can restrict airflow and reduce cooling efficiency. It's advisable to regularly check refrigerant levels and clean the filter. If the issue persists, a comprehensive inspection at an authorized 4S dealership is recommended to prevent potential electrical failures. For safety reasons, don't delay addressing the problem—comfort in high temperatures directly impacts driving safety.

[HoldenAnn]

As someone who enjoys tinkering with cars, I've found that the Audi Q5's air conditioning fails after half an hour of use, and there are quite a few possible reasons. Most likely, it's an issue with the expansion valve or temperature sensor. A stuck valve can restrict refrigerant flow, while a faulty sensor misreading the temperature may cause the system to shut off cooling prematurely. I've also looked into common electronic control module failures in these vehicles, such as software bugs or aging wiring, which can interrupt the cooling cycle. Another possibility is poor condenser heat dissipation; when clogged with debris, temperatures rise quickly. You can start by checking the cabin air filter and fan operation, giving them a simple clean, but for more complex issues, it's best to consult a professional mechanic who can use a pressure gauge to test the system pressure. Remember, regular maintenance is crucial—otherwise, minor issues can turn into costly and time-consuming major repairs.

[JakeLee]

My Q5's AC stops cooling after running for half an hour, which is really annoying. The most common causes are refrigerant leaks or compressor overheating causing it to shut down—compressors have a self-protection mechanism that stops them in high temperatures. Another possibility is air or moisture getting into the AC system, blocking the circulation. Additionally, if the electric fan is damaged or clogged with dust, poor heat dissipation will reduce cooling efficiency. In such cases, don't force the AC to keep running—turn it off, wait a while, and try again, or go straight to a repair shop for inspection. Regular vehicle maintenance is important, and avoid prolonged AC use in extreme weather conditions.