2018 Mercedes-Benz S65 AMG AC Isn't Working

Common Causes of AC Malfunctions in Your 2018 Mercedes-Benz S65 AMG 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 2018 Mercedes-Benz S65 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 S65 AMG?

When your 2018 Mercedes-Benz S65 AMG's AC isn't functioning properly, start by checking the thermostat settings to ensure they are correctly adjusted. A simple misconfiguration can often be the culprit. Next, inspect the air filters; if they are dirty or clogged, replacing them can significantly improve airflow and AC performance. It's also crucial to examine the refrigerant levels, as low levels can lead to inadequate cooling. If you suspect a leak, look for oily residue around the AC connections and hoses, as this can indicate refrigerant loss. Additionally, test the compressor to confirm it is engaging when the AC is activated, as a malfunctioning compressor can hinder cooling. Finally, inspect all electrical connections related to the AC system for any signs of damage or looseness, as faulty connections can prevent the system from operating effectively. By following these steps, you can systematically diagnose and potentially resolve the AC issues in your vehicle.

What are the common problems that could cause the AC system to fail in a 2018 Mercedes-Benz S65 AMG?

When diagnosing AC system issues in a 2018 Mercedes-Benz S65 AMG, it's essential to be aware of several common problems that can lead to system failure. One of the primary culprits is refrigerant leaks, which can significantly diminish cooling performance. If you notice a lack of cold air, checking for leaks in the hoses and connections should be your first step. Another critical component is the compressor; if it fails, the entire AC system will be rendered ineffective. Listen for unusual noises or check for signs of wear to determine if the compressor needs replacement. Additionally, electrical issues, such as faulty wiring or malfunctioning sensors, can disrupt the AC's operation, so inspecting the electrical system is crucial. Clogged components like the orifice tube or expansion valve can also hinder refrigerant flow, leading to inadequate cooling. Lastly, don't overlook the condenser, as any damage can severely impact the system's efficiency. By understanding these common problems, DIYers can take proactive steps to troubleshoot and maintain their vehicle's AC system effectively.

How urgent is it to repair the non-functioning AC in a 2018 Mercedes-Benz S65 AMG?

When faced with a non-functioning AC in your 2018 Mercedes-Benz S65 AMG, the urgency to address the issue cannot be overstated. The comfort of your driving experience is significantly compromised without a working AC, especially during sweltering summer months or on long journeys where the cabin can quickly become stifling. Beyond mere comfort, safety is a critical concern; a malfunctioning AC can lead to fogged windows, severely impairing visibility and increasing the risk of accidents. Additionally, neglecting AC repairs can place undue strain on other vehicle components, potentially resulting in more extensive and costly damage over time. Lastly, for owners of luxury vehicles like the S65 AMG, maintaining the AC system is essential for preserving the car's resale value. Promptly addressing AC issues not only enhances your driving experience but also safeguards your vehicle's overall integrity and future worth.

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