2017 Mercedes-Benz CLA45 AMG AC Isn't Working

Common Causes of AC Issues in Your 2017 Mercedes-Benz CLA45 AMG and How to Resolve Them

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Reviewed by
Andrew Hajjar
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 CLA45 AMG 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 2017 Mercedes-Benz CLA45 AMG?

When faced with an AC malfunction in your 2017 Mercedes-Benz CLA45 AMG, start by checking the thermostat settings to ensure they are correctly adjusted, as this simple step can often resolve the issue. Next, inspect the air filters for dirt or clogs, as these can significantly restrict airflow and hinder AC performance. If the problem persists, examine the refrigerant levels; low levels can lead to warm air blowing from the vents, so consider having a professional check and refill if necessary. Additionally, look for any visible signs of leaks in the AC system, such as oily residue around hoses or connections, which can indicate a refrigerant loss. Testing the compressor is also crucial; it should engage properly when the AC is activated, and if it doesn’t, it may require repair or replacement. Lastly, inspect the electrical connections related to the AC system for any loose or damaged wires, as faulty connections can prevent the system from operating efficiently. By following these diagnostic steps, you can effectively troubleshoot the AC issues in your vehicle and determine the best course of action.

What are the common causes for the AC not working in a 2017 Mercedes-Benz CLA45 AMG?

When troubleshooting the air conditioning system in a 2017 Mercedes-Benz CLA45 AMG, it's important to consider several common problems that could be affecting its performance. One of the most frequent culprits is a refrigerant leak, which can significantly reduce the system's ability to produce cool air. Additionally, a faulty compressor may prevent the AC from functioning altogether, as this component 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 issue is a clogged or blocked condenser, which can hinder airflow and cooling efficiency. Furthermore, if the blower motor is malfunctioning, it can lead to inadequate airflow, impacting the overall cooling performance. Lastly, a malfunctioning thermostat can cause improper temperature regulation, further complicating the AC's functionality. By systematically examining these areas, DIY enthusiasts can identify and address the root cause of their AC problems, potentially saving time and money before consulting a professional.

How urgent is it to address the non-functioning AC in a 2017 Mercedes-Benz CLA45 AMG?

Addressing a non-functioning AC in your 2017 Mercedes-Benz CLA45 AMG is not just a matter of comfort; it is a critical issue that requires immediate attention. A malfunctioning AC system can lead to an uncomfortable driving experience, especially during sweltering summer months, making long drives unbearable. More importantly, the safety implications cannot be overlooked; a faulty AC can cause windows to fog up, severely impairing visibility and increasing the risk of accidents. Additionally, neglecting AC issues can result in further damage to the system, leading to more extensive and costly repairs in the future. Lastly, maintaining all vehicle components, including the AC, is essential for preserving the resale value of your car. Therefore, it is crucial to act promptly to ensure your vehicle remains safe, comfortable, and valuable.

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2017 Mercedes-Benz CLA45 AMG AC Issues & Solutions