2012 Mercedes-Benz GL350 AC Isn't Working

Common Causes of AC Failure in Your 2012 Mercedes-Benz GL350 and How to Fix Them

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
37% chance it's the
Refrigerant Leak
0%
21% chance it's the
Climate Control Electrical Issue
0%
12% chance it's the
AC Compressor
0%
30% chance it's
Something else
The most common reasons a 2012 Mercedes-Benz GL350 AC isn't working are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor.
  • Refrigerant Leak: A refrigerant leak can occur due to damaged hoses, seals, or connections, resulting in decreased cooling efficiency in the air conditioning system.
  • Climate Control Electrical Issue: A faulty climate control module or a blown fuse could be causing the electrical issues in the climate control system.
  • AC Compressor: A faulty AC compressor may be due to a lack of lubrication, electrical issues, or internal mechanical failure, resulting in inadequate cooling performance.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

What are the initial diagnostic steps to take when the AC isn't working in a 2012 Mercedes-Benz GL350?

When your 2012 Mercedes-Benz GL350's air conditioning system fails to operate, start with a systematic approach to diagnose the issue effectively. Begin by checking for any refrigerant leaks, as low refrigerant levels can significantly impact AC performance. Next, ensure that the climate control system is powered by turning the ignition on and pressing the down arrow button until "LO" appears on the display. This confirms that the system is receiving power. If the AC compressor is not running, it may indicate a malfunction, so verify its operation. Additionally, inspect the fuse box for any blown fuses, as this could be a simple fix for your AC troubles. If everything appears intact, try pressing and holding the reset button to refresh the air conditioning system. Finally, check the system pressure for leaks and examine the low-pressure sensor and compressor clutch, as these components can also affect functionality. By following these diagnostic steps, you can identify and potentially resolve the AC issue in your vehicle, saving time and money on professional repairs.

What are the common causes for the AC not working in a 2012 Mercedes-Benz GL350?

When your 2012 Mercedes-Benz GL350's air conditioning system fails to deliver cool air, it can be frustrating, but understanding the common causes can help you diagnose the issue. One of the primary culprits is a refrigerant leak, which can significantly reduce the system's cooling efficiency. Additionally, a faulty compressor may prevent the AC from functioning altogether, as it is essential for circulating refrigerant throughout the system. Electrical issues, such as blown fuses or damaged wiring, can also disrupt the AC's operation, making it crucial to check these components. Another potential problem is a clogged or blocked condenser, which can hinder airflow and cooling performance. If the blower motor is malfunctioning, it can lead to inadequate airflow, further complicating the cooling process. Lastly, a malfunctioning thermostat can cause improper temperature regulation, affecting the overall performance of the AC system. By systematically checking these common issues, you can effectively troubleshoot and potentially resolve the AC problems in your vehicle.

How urgent is it to address the non-functioning AC in a 2012 Mercedes-Benz GL350?

Addressing a non-functioning AC in your 2012 Mercedes-Benz GL350 is crucial for both comfort and safety, particularly in hot weather conditions. Driving without a working air conditioning system can lead to significant discomfort, which may distract you from the road and impair your driving ability. Moreover, prolonged exposure to high temperatures inside the vehicle can pose serious health risks, especially for vulnerable passengers such as children or the elderly. Additionally, a malfunctioning AC may signal deeper issues within the vehicle's cooling system, potentially leading to more severe damage if left unchecked. By prioritizing the repair of your AC system, you not only enhance your driving experience but also prevent costly repairs in the future, ensuring the longevity and reliability of your vehicle. Therefore, it is advisable to take immediate action to diagnose and fix the AC issue to maintain both your comfort and the overall health of your Mercedes-Benz.

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