2018 Mercedes-Benz GLC43 AMG AC Isn't Working

Common Causes of AC Malfunctions in Your 2018 Mercedes-Benz GLC43 AMG and How to Fix Them

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Reviewed by
Bo Fader
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 2018 Mercedes-Benz GLC43 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 2018 Mercedes-Benz GLC43 AMG?

When faced with an AC malfunction in your 2018 Mercedes-Benz GLC43 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 air filters are clean, 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 connections, which can indicate 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 functioning efficiently. By systematically following these diagnostic steps, you can effectively troubleshoot and potentially resolve the AC issues in your vehicle.

What are the common problems that could cause the AC to stop working in a 2018 Mercedes-Benz GLC43 AMG?

When the air conditioning system in a 2018 Mercedes-Benz GLC43 AMG ceases to function, several common issues may be at play. One of the primary culprits is low refrigerant levels, which can significantly impair cooling performance. If the refrigerant is insufficient, the system may struggle to cool the cabin effectively. Another frequent issue is a faulty compressor; if the compressor is malfunctioning, it can prevent the AC from operating as intended. Additionally, electrical problems, such as blown fuses or damaged wiring, can disrupt the system's functionality. Clogged or leaking refrigerant lines can also hinder performance, as blockages or leaks prevent the proper flow of refrigerant. Furthermore, defects in the condenser or evaporator can compromise the AC's cooling capacity, while malfunctioning sensors may lead to incorrect temperature readings, causing the system to operate inefficiently. For those looking to troubleshoot these issues, it is crucial to conduct a thorough inspection and consider consulting a qualified technician for repairs to ensure the AC system operates optimally.

How urgent is it to address the AC failure in a 2018 Mercedes-Benz GLC43 AMG?

When faced with an AC failure in a 2018 Mercedes-Benz GLC43 AMG, it is crucial to recognize the urgency of addressing the problem. While it may not seem like an immediate emergency, delaying repairs can lead to significant discomfort for passengers, especially during hot weather or long journeys. A malfunctioning AC system not only affects the driving experience but can also indicate deeper issues within the vehicle's cooling or electrical systems. Ignoring these symptoms may result in more extensive and costly repairs down the line, as underlying problems could worsen over time. Therefore, taking prompt action to diagnose and repair the AC system is essential for maintaining both comfort and the overall performance of your vehicle, ensuring a safe and enjoyable driving experience.

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2018 Mercedes-Benz GLC43 AMG AC System Troubleshooting Guide