2017 Mercedes-Benz CLS550 AC Isn't Working

Common Causes of AC Issues in Your 2017 Mercedes-Benz CLS550 and How to Resolve 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 2017 Mercedes-Benz CLS550 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 steps to diagnose the AC issue in a 2017 Mercedes-Benz CLS550?

To effectively diagnose the AC issue in your 2017 Mercedes-Benz CLS550, start by checking the air filters, as clean filters are essential for proper airflow and cooling efficiency. Next, inspect the refrigerant levels; low refrigerant can significantly hinder the AC's performance, so ensure they are within the recommended range. Following this, examine the AC compressor for any visible signs of damage or wear, as a malfunctioning compressor can lead to inadequate cooling. Additionally, test the thermostat to confirm it is regulating the vehicle's temperature correctly, as a faulty thermostat can disrupt the entire system's functionality. Finally, look for any leaks in the AC system, as refrigerant loss due to leaks can severely impact cooling performance. By systematically addressing these areas, you can effectively diagnose and potentially resolve AC issues in your vehicle.

What are the common problems that could cause the AC system to stop working in a 2017 Mercedes-Benz CLS550?

When the AC system in a 2017 Mercedes-Benz CLS550 ceases to function, it can be frustrating, but understanding the common problems can help you troubleshoot effectively. One prevalent issue is refrigerant leaks, which can significantly diminish the system's cooling ability. If you notice a lack of cold air, checking for leaks in the refrigerant lines is a good starting point. Another critical component to inspect is the compressor; if it’s faulty, the AC may not cool at all. Additionally, electrical issues such as blown fuses or damaged wiring can disrupt the system's operation, so examining the electrical components is essential. Clogged expansion valves can also hinder refrigerant flow, leading to inadequate cooling, while a malfunctioning blower motor can prevent air from circulating properly through the vents. By identifying these common problems, you can take the first steps toward restoring your vehicle's AC functionality, whether through DIY repairs or by consulting a professional.

How urgent is it to repair the non-functioning AC in a 2017 Mercedes-Benz CLS550?

When faced with a non-functioning AC in your 2017 Mercedes-Benz CLS550, the urgency to address the issue cannot be overstated. A reliable air conditioning system is essential for maintaining a comfortable driving environment, particularly during sweltering summer months or on long journeys. Without it, the cabin can quickly become stifling, leading to discomfort for both the driver and passengers. Moreover, the safety implications are significant; driving in extreme heat without adequate cooling can distract the driver and increase fatigue, ultimately compromising road safety. Additionally, neglecting AC repairs can exacerbate the problem, potentially causing further damage to the system that may result in more extensive and costly repairs down the line. Therefore, it is crucial to prioritize the repair of your vehicle's AC system not only to enhance comfort and safety but also to prevent future complications and expenses.

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2017 Mercedes-Benz CLS550 AC Issues: Causes & Repairs