2015 Mercedes-Benz GL450 AC Isn't Working

Common Causes of AC Failure in Your 2015 Mercedes-Benz GL450 and How to Fix Them

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Reviewed by
Aisha
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 2015 Mercedes-Benz GL450 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 short circuit in the wiring can disrupt the electrical signals needed for proper operation of 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 initial steps should I take to diagnose AC issues in a 2015 Mercedes-Benz GL450?

To effectively diagnose AC issues in your 2015 Mercedes-Benz GL450, begin with a thorough inspection of the system's pressure and look for any visible refrigerant leaks, as these are common culprits in AC failures. Next, check the functionality of the low-pressure sensor on the compressor and inspect the clutch to ensure they are operating correctly. A dirty cabin air filter can significantly impede airflow, so examine it for dirt and debris, replacing it if necessary. Additionally, inspect the condenser and evaporator for any clogs or dirt that could be affecting performance. Pay attention to the blower motor, compressor, and blend door actuator for any signs of malfunction. Lastly, assess the electrical system for faults that may disrupt AC operation. By following this structured approach, you can identify and address the root causes of AC problems, ensuring your vehicle's climate control system operates efficiently.

What are the common problems that could cause the AC to stop working in a 2015 Mercedes-Benz GL450?

When the air conditioning system in a 2015 Mercedes-Benz GL450 fails to deliver cool air, several common problems may be at play. One of the primary culprits is a refrigerant leak, which can significantly reduce the system's ability to cool the air effectively. This issue often requires a thorough inspection to locate and repair the leak, followed by recharging the refrigerant. Another frequent cause of AC malfunction is an electrical climate control issue, where faulty controls or sensors disrupt the system's operation. Diagnosing this problem may involve checking the electrical connections and ensuring that the climate control module is functioning correctly. Additionally, a malfunctioning air conditioning compressor can lead to inadequate cooling; if the compressor is not engaging or is damaged, it will need to be repaired or replaced to restore proper AC function. For those looking to tackle these issues themselves, understanding these common problems is crucial for effective troubleshooting and repair of the air conditioning system in their Mercedes-Benz GL450.

How urgent is it to repair the non-functioning AC in a 2015 Mercedes-Benz GL450?

Addressing a non-functioning AC in your 2015 Mercedes-Benz GL450 should be a priority, as neglecting this issue can lead to significant discomfort and potential safety risks. In extreme weather conditions, a malfunctioning AC can make driving unbearable, impacting both driver and passenger comfort. Moreover, the AC system's failure may indicate underlying problems that could escalate if not resolved promptly, leading to more extensive and costly repairs down the line. Additionally, delaying repairs can place undue stress on other vehicle components, potentially compromising their performance and longevity. Common issues such as refrigerant leaks or compressor failures, if left unaddressed, can result in further damage to the AC system, ultimately affecting its efficiency. Therefore, it is crucial to act swiftly to ensure a comfortable and safe driving experience while preserving the overall health of your vehicle.

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Troubleshooting 2015 Mercedes-Benz GL450 AC Problems